BMW F20 and F21 1 Series engines: every engine, fitment and price

The second 1 Series was built from 2011 to 2019 as a five-door and three-door. Engines included the N13, B38, N20, B48, N55 and B58 petrols and the N47, B37 and B47 diesels.

In total, 11 model and engine combinations are listed for the BMW F20 and F21 1 Series in our data, using 6 engine families: N47, N55, N13, N20 and N26, B37 and B47. Production covered 2011–2019. We currently hold 255 engines that suit these cars.

Every BMW F20 and F21 1 Series engine at a glance

BMW F20 and F21 1 Series: petrol engines

N55 in the BMW F20 and F21 1 Series

F20 M135i: N55B30, 3.0 L, 306 hp and 400 Nm (2009–2017). See every N55B30 in stock.

BMW introduced the N55 with a single twin-scroll turbo, Valvetronic and solenoid direct injectors.

On the N55, our workshop watches for oil filter housing gasket, valve cover gasket and electric water pump and thermostat. Replace the oil filter housing gasket and valve cover gasket before installing a used N55.

Read our full N55 guide

We have 81 N55 engines that suit the BMW F20 and F21 1 Series, from 1.887,00 €.

N13 in the BMW F20 and F21 1 Series

The F20 116i uses the N13B16, a 1.6 L inline-4 rated at 136 hp and 220 Nm, built 2011–2016.

The F20 118i uses the N13B16, a 1.6 L inline-4 rated at 136 hp and 220 Nm, built 2011–2016.

BMW adapted the Prince engine for longitudinal mounting in rear-drive cars.

On the N13, our workshop watches for timing chain stretch, carbon build-up and high-pressure fuel pump. Change the chain and tensioner when buying a high-mileage unit.

Read our full N13 guide

We have 3 N13 engines that suit the BMW F20 and F21 1 Series, from 1.222,00 €.

N20 and N26 in the BMW F20 and F21 1 Series

F20 120i: N20B16, 1.6 L, 170 hp and 250 Nm (2012–2017).

Launched in 2011 to replace the N52 and N46 in many cars, the N20 combined a twin-scroll turbocharger, direct injection, Valvetronic and double VANOS.

On the N20 and N26, our workshop watches for timing chain guide, oil pump drive chain and electric water pump. Replacing the chain on an N20 normally needs the engine out, so a used unit is the time to do it.

Read our full N20 and N26 guide

We have 1 N20 and N26 engines that suit the BMW F20 and F21 1 Series, from 3.007,00 €.

BMW F20 and F21 1 Series: diesel engines

N47 in the BMW F20 and F21 1 Series

F20 120d: N47D20, 2.0 L, 184 hp and 380 Nm (2007–2016). See every N47D20 in stock.

F20 120d: N47D20D, 2.0 L, 184 hp and 380 Nm (2007–2015). See every N47D20D in stock.

The F20 114d uses the N47D16, a 1.6 L inline-4 rated at 116 hp and 260 Nm, built 2010–2015.

F20 116d: N47D16, 1.6 L, 116 hp and 260 Nm (2010–2015).

For the F20 125d, BMW fitted the N47D20T1 — 2.0 L, turbocharged, 218 hp.

BMW launched the N47 in 2007 with an aluminium block, common-rail injection and a rear-mounted timing chain.

On the N47, our workshop watches for timing chain, swirl flaps and egr cooler. Replace the timing chain and guides when fitting a used N47 unless they were recently done.

Read our full N47 guide

We have 88 N47 engines that suit the BMW F20 and F21 1 Series, from 1.074,00 €.

B37 in the BMW F20 and F21 1 Series

For the F20 116d, BMW fitted the B37C15 — 1.5 L, turbocharged, 116 hp. See every B37C15 in stock.

BMW launched the B37 in 2014 as part of the modular B-series, sharing parts with the B47 and B57.

On the B37, our workshop watches for egr system, diesel particulate filter and engine mounts. Check front-drive (B37C) or rear-drive (B37D) before ordering.

Read our full B37 guide

We have 35 B37 engines that suit the BMW F20 and F21 1 Series, from 1.150,00 €.

B47 in the BMW F20 and F21 1 Series

For the F20 118d, BMW fitted the B47D20A — 2.0 L, turbocharged, 150 hp. See every B47D20A in stock.

BMW launched the B47 in 2014 to replace the N47.

On the B47, our workshop watches for egr cooler, diesel particulate filter and injectors. Check front-drive (B47C) or rear-drive (B47D) before ordering.

Read our full B47 guide

We have 7 B47 engines that suit the BMW F20 and F21 1 Series, from 1.450,00 €.

Will it fit? BMW F20 and F21 1 Series engine questions

Will the N47D20 fit my BMW F20 120d?

Yes, the BMW F20 120d left the factory with the N47D20, so an N47D20 from another car is the direct replacement. The second 1 Series five-door was built 2011–2019, and the N47D20 was produced 2007–2016, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 120d?

We have 76 N47D20 engines from F20 donor cars, priced from 1.116,00 € to 3.299,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N47D20D fit my BMW F20 120d?

Yes, the BMW F20 120d left the factory with the N47D20D, so an N47D20D from another car is the direct replacement. The second 1 Series five-door was built 2011–2019, and the N47D20D was produced 2007–2015, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 120d?

We have 12 N47D20D engines from F20 donor cars, priced from 1.148,00 € to 3.299,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N47D16 fit my BMW F20 114d?

The N47D16 is the original engine for the BMW F20 114d, which makes it the straightforward choice. The second 1 Series five-door was built 2011–2019, and the N47D16 was produced 2010–2015, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 114d?

We have 1 N47D16 engine from F20 donor cars, priced from 3.129,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N47D16 fit my BMW F20 116d?

Yes, the BMW F20 116d left the factory with the N47D16, so an N47D16 from another car is the direct replacement. The second 1 Series five-door was built 2011–2019, and the N47D16 was produced 2010–2015, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 116d?

We have 1 N47D16 engine from F20 donor cars, priced from 3.129,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N13B16 fit my BMW F20 116i?

For the BMW F20 116i, the N13B16 is the factory engine and the one to order. The second 1 Series five-door was built 2011–2019, and the N13B16 was produced 2011–2016, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 116i?

We have 3 N13B16 engines from F20 donor cars, priced from 1.222,00 € to 3.149,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N13B16 fit my BMW F20 118i?

The N13B16 is the original engine for the BMW F20 118i, which makes it the straightforward choice. The second 1 Series five-door was built 2011–2019, and the N13B16 was produced 2011–2016, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 118i?

We have 3 N13B16 engines from F20 donor cars, priced from 1.222,00 € to 3.149,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N47D20T1 fit my BMW F20 125d?

Yes, the BMW F20 125d left the factory with the N47D20T1, so an N47D20T1 from another car is the direct replacement. The second 1 Series five-door was built 2011–2019, and the N47D20T1 was produced 2011–2015, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 125d?

We have 1 N47D20T1 engine from F20 donor cars, priced from 1.663,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the N20B16 fit my BMW F20 120i?

For the BMW F20 120i, the N20B16 is the factory engine and the one to order. The second 1 Series five-door was built 2011–2019, and the N20B16 was produced 2012–2017, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 120i?

We have 1 N20B16 engine from F20 donor cars, priced from 3.007,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Will the B47D20A fit my BMW F20 118d?

The B47D20A is the original engine for the BMW F20 118d, which makes it the straightforward choice. The second 1 Series five-door was built 2011–2019, and the B47D20A was produced 2014–2020, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW F20 118d?

We have 3 B47D20A engines from F20 donor cars, priced from 1.450,00 € to 1.883,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Engine swap questions for the BMW F20 and F21 1 Series

Owners often ask whether a more powerful engine from another BMW F20 and F21 1 Series model can be fitted. These answers show what each upgrade involves.

Can I fit the N55B30 from the F20 M135i into an F20 120d?

It is a full conversion: the N55B30 runs on petrol and the N47D20D on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 122 hp and 20 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N20B16 from the F20 120i into an F20 114d?

It is a full conversion: the N20B16 runs on petrol and the N47D16 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 54 hp and 0 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F20 M135i into an F20 114d?

It is a full conversion: the N55B30 runs on petrol and the N47D16 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 190 hp and 140 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F20 M135i into an F20 116d?

It is a full conversion: the N55B30 runs on petrol and the B37C15 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 190 hp and 130 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N47D20D from the F20 120d into an F20 116d?

It is a conversion rather than a replacement. The N47D20D is an inline-4 and the B37C15 an inline-3, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 68 hp and 110 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N47D20D from the F20 120d into an F20 116i?

It is a full conversion: the N47D20D runs on diesel and the N13B16 on petrol, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 48 hp and 160 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N47D20T1 from the F20 125d into an F20 116i?

It is a full conversion: the N47D20T1 runs on diesel and the N13B16 on petrol, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 82 hp and 230 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N47D20D from the F20 120d into an F20 118i?

It is a full conversion: the N47D20D runs on diesel and the N13B16 on petrol, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 48 hp and 160 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N20B16 from the F20 120i into an F20 118i?

It is possible, and it is one of the more common upgrades. Both engines are petrol inline-4 units, so the engine bay and mounting points are similar, but the N20B16 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 34 hp and 30 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F20 M135i into an F20 125d?

It is a full conversion: the N55B30 runs on petrol and the N47D20T1 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 88 hp and 0 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F20 M135i into an F20 120i?

It is a conversion rather than a replacement. The N55B30 is an inline-6 and the N20B16 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 136 hp and 150 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N47D20D from the F20 120d into an F20 120i?

It is a full conversion: the N47D20D runs on diesel and the N20B16 on petrol, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 14 hp and 130 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F20 M135i into an F20 118d?

It is a full conversion: the N55B30 runs on petrol and the B47D20A on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 156 hp and 80 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N20B16 from the F20 120i into an F20 118d?

It is a full conversion: the N20B16 runs on petrol and the B47D20A on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 20 hp and 0 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Fitment and swap notes for the BMW F20 and F21 1 Series

• The M135i uses the N55; the M140i uses the B58.

Engines from the same family usually share mounts and gearbox bolt patterns, but wiring, ECU, sump and cooling differ between versions. Moving to a different family is a conversion, not a replacement.

N47: Remaps add around 30 hp; check the chain first.

N55: Remaps add a lot; upgraded turbos and fuel pumps take it further.

N13: Remaps raise output modestly. The engine is mainly bought as a direct replacement.

N20 and N26: Remaps unlock significant gains. A healthy N20 with updated guides is a good tuning base.

B37: Remaps add around 20 hp.

B47: Remaps add around 30 hp.

Known problems by engine in the BMW F20 and F21 1 Series

N47

• Timing chain. Listen for a rattle at the gearbox end on a cold start and ask whether the chain has been replaced.
• Swirl flaps. Check the intake for damage.
• EGR cooler. Check the recall status and for coolant loss.
• Diesel particulate filter. Read the soot load and DPF fault codes.
• Injectors. Read injector correction values.

N55

• Oil filter housing gasket. Look below the filter housing.
• Valve cover gasket. Look for oil on the exhaust side.
• Electric water pump and thermostat. Check cooling codes.
• Charge pipe. Listen for boost leaks.
• Wastegate rattle. Listen when lifting off.
• Oil pan gasket. Check underneath.

N13

• Timing chain stretch. Listen on a cold start and check timing values.
• Carbon build-up. Inspect the intake valves with a borescope.
• High-pressure fuel pump. Check fuel pressure fault codes.
• Turbo wastegate. Listen for a rattle when lifting off.

N20 and N26

• Timing chain guide. Listen for a whine or rattle; ask if the updated guides and chain are fitted.
• Oil pump drive chain. Check oil pressure warnings.
• Electric water pump. Check for cooling fault codes.
• Oil filter housing and valve cover gaskets. Look at the exhaust side for oil.
• Carbon build-up. Borescope inspection.

B37

• EGR system. Check for EGR fault codes.
• Diesel particulate filter. Read the soot load.
• Engine mounts. Check the mounts.

B47

• EGR cooler. Check the recall status for the donor car.
• Diesel particulate filter. Read the soot load.
• Injectors. Read injector correction values.

How to identify the right engine for your BMW F20 and F21 1 Series

Start with the VIN. The last seven characters identify your car in BMW's systems, and from them we can confirm the engine code, the production date, the gearbox and whether the car has xDrive. That is the only reliable way to order.

Next, check the stamp on the block. On most BMW four- and six-cylinder engines it sits on the left side of the block below the intake; on V engines it is usually at the back near the gearbox. The stamp shows the engine code and serial number.

Finally, compare the ancillaries. Two engines with the same code can carry different turbos, injectors, manifolds or sensors depending on the model and market. Our listings show what is fitted to each unit.

BMW F20 and F21 1 Series engine prices

Across 255 BMW F20 and F21 1 Series engine units in our stock today, prices start at 913,00 € and reach 5.371,00 €. The median — the price in the middle of the range — is 2.004,00 €.

Prices depend on the exact version, the donor's mileage, how complete the engine is and the demand for that code. Higher-output versions, low mileage and dressed engines with turbo, injectors and ancillaries cost more; long blocks and higher mileage cost less.

BMW F20 and F21 1 Series engine prices by model year

Engines from 2010–2014 have a median of 3.195,00 €, while units from 2020–2024 sit at 1.548,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

BMW F20 and F21 1 Series engine prices by mileage

Mileage matters less than history on a well-maintained BMW engine, but it is a useful guide. A low-mileage unit from a younger car gives you more life for a modest premium.

BMW F20 and F21 1 Series engines in stock now

Here is a selection of BMW F20 and F21 1 Series engine engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW F20 116d B37C15 Engine 2020, 20,400 km1.298,00 €BMW F20 120d N47D20C Engine 2011, 60,400 km1.890,00 €BMW F20 118i B38A15 Engine 2022, 195,800 km1.816,00 €BMW F20 120d N47D20C Engine 2015, 112,900 km2.072,00 €BMW F20 118i B38A15 Engine 2019, 56,000 km1.985,00 €BMW F20 M135i N55B30 Engine 2012, 199,300 km4.689,00 €BMW F20 120d N47D20C Engine 2011, 113,800 km1.752,00 €BMW F20 120d N47D20C Engine 2015, 106,400 km1.688,00 €BMW F20 M135i N55B30 Engine 2016, 74,300 km4.542,00 €BMW F20 M135i N55B30 Engine 2015, 33,700 km3.527,00 €BMW F20 116d B37C15 Engine 2018, 62,600 km1.783,00 €BMW F20 118i B38A15 Engine 2017, 81,800 km1.543,00 €

BMW F20 116d B37C15 Engine 2020, 20,400 km — 1.298,00 €, reduced from 2.350,00 €. It comes from a 2020 donor car with 20,400 km, and 30 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F20 120d N47D20C Engine 2011, 60,400 km — 1.890,00 €, reduced from 2.950,00 €. It comes from a 2011 donor car with 60,400 km, and 14 units are available. The listing shows every side of the engine and the fitted parts.

BMW F20 118i B38A15 Engine 2022, 195,800 km — 1.816,00 €, reduced from 2.800,00 €. It comes from a 2022 donor car with 195,800 km, and 16 units are available. The listing shows every side of the engine and the fitted parts.

BMW F20 120d N47D20C Engine 2015, 112,900 km — 2.072,00 €, reduced from 3.250,00 €. It comes from a 2015 donor car with 112,900 km, and 10 units are available. The listing shows every side of the engine and the fitted parts.

BMW F20 118i B38A15 Engine 2019, 56,000 km — 1.985,00 €, reduced from 2.900,00 €. It comes from a 2019 donor car with 56,000 km, and 28 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F20 M135i N55B30 Engine 2012, 199,300 km — 4.689,00 €, reduced from 5.300,00 €. It comes from a 2012 donor car with 199,300 km, and 20 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F20 120d N47D20C Engine 2011, 113,800 km — 1.752,00 €, reduced from 2.600,00 €. It comes from a 2011 donor car with 113,800 km, and 27 units are available. We can confirm fitment against your VIN the same day.

BMW F20 120d N47D20C Engine 2015, 106,400 km — 1.688,00 €, reduced from 2.550,00 €. It comes from a 2015 donor car with 106,400 km, and 27 units are available. We can confirm fitment against your VIN the same day.

BMW F20 M135i N55B30 Engine 2016, 74,300 km — 4.542,00 €, reduced from 5.150,00 €. It comes from a 2016 donor car with 74,300 km, and 11 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F20 M135i N55B30 Engine 2015, 33,700 km — 3.527,00 €, reduced from 4.100,00 €. It comes from a 2015 donor car with 33,700 km, and 17 units are available. The listing shows every side of the engine and the fitted parts.

BMW F20 116d B37C15 Engine 2018, 62,600 km — 1.783,00 €, reduced from 2.700,00 €. It comes from a 2018 donor car with 62,600 km, and 16 units are available. The listing shows every side of the engine and the fitted parts.

BMW F20 118i B38A15 Engine 2017, 81,800 km — 1.543,00 €, reduced from 2.100,00 €. It comes from a 2017 donor car with 81,800 km, and 12 units are available. Ask the desk for compression figures or extra photographs before you order.

Buying checklist for a BMW F20 and F21 1 Series engine

1. Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
2. Ask how the donor car was damaged. Most good used engines come from cars with body damage. A front-end impact can crack sensors, the timing cover or the sump; a rear or side impact usually leaves the engine untouched. The yard records the damage on each unit.
3. Compression or leak-down figures. Even compression across all cylinders tells you more than mileage. Ask for the figures, not just a pass or fail, and compare the highest and lowest readings: a spread above 10 to 15 percent deserves a question.
4. Look at the oil and coolant. Clean oil without metal particles and coolant without oil are good signs. Milky oil, oily coolant or a burnt smell mean the engine needs further checks before it is fitted.
5. Photographs from every side. Good suppliers photograph the actual engine you will receive. Look for the block stamp, the sump, the timing cover and any broken brackets or connectors in the pictures.
6. List of what is fitted. Engines are sold with different ancillaries: some have the turbo, injectors, manifolds, alternator and starter, others are long blocks. Agree the list in writing so you know which parts must come from your old engine.
7. Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
8. Gearbox and flywheel match. Manual and automatic engines differ at the flywheel or flexplate, and sometimes at the crankshaft spigot. Make sure the engine you buy matches your gearbox or that you transfer the right parts.
9. Warranty terms in writing. Read what the warranty covers, how long it runs and what fitting conditions apply. Most warranties require a qualified workshop, new fluids and filters, and replacement of the cooling parts that caused the original failure.
10. Why your old engine failed. Before fitting a replacement, find out why the original failed. An overheating radiator, a blocked intercooler or a failed turbo can destroy a second engine if they are not fixed.
11. Turbocharger shaft play and oil. Rotate the compressor wheel by hand. A small amount of side play is normal; in-and-out play or wheel contact with the housing is not. Oil pooled in the intake or intercooler pipes points to worn seals.
12. Injector correction values. On a diesel that can be run before removal, the injector correction values show whether one injector is delivering more or less fuel than the others. Large deviations mean an injector is on its way out.
13. Particulate filter and EGR history. Short-trip diesels clog their DPF and EGR systems. The engine may be fine, but ask whether the donor car had DPF warnings, and plan to clean or check your own filter before fitting.
14. Swirl flaps. Check whether the swirl flaps are in place, blanked or removed. Broken swirl flaps are a known cause of engine failure on several BMW diesels, so many owners fit blanking plates when the intake is off.
15. Timing chain noise. Listen for a rattle at the front of the engine for the first seconds after a cold start. On an engine that cannot be run, look at the chain guides through the oil filler or with the valve cover off.
16. Gearbox-end timing chain. On this engine the timing chain sits at the gearbox end, so replacing it normally means removing the engine. If the chain has not been replaced, the time to do it is before the engine goes into your car.
17. VANOS operation. Rough idle, a rattle from the front of the head and a loss of torque at low revs point to VANOS seals or solenoids. These are serviceable parts and are easier to renew with the engine out.
18. Double VANOS units and solenoids. Ask for the adaptation values or fault history if the engine was running. Solenoids are inexpensive and are often replaced as a matter of course on a used engine.
19. Valvetronic motor and eccentric shaft sensor. The Valvetronic motor and its sensor cause limp-mode faults when they fail. Inspect the connector and the seal around the motor for oil.
20. Injectors and high-pressure fuel pump. Direct-injection engines rely on high-pressure pumps and precise injectors. Ask whether the injectors are original or updated and whether there were fuel pressure faults.
21. Electric water pump. This engine uses an electric water pump. It fails without warning and needs a diagnostic bleeding routine when it is replaced or the system is refilled.

Fitting an engine to your BMW F20 and F21 1 Series

1. Compare the engines side by side. Put the replacement next to the old engine and compare sensors, brackets, connectors, the sump, the starter and the flywheel or flexplate. Note anything that must be transferred.
2. Transfer the parts that differ. Move the parts that are specific to your car, such as the engine harness on some models, the sump on xDrive cars or the air conditioning compressor bracket. Use new seals and gaskets for everything you move.
3. Replace the rear main seal and drive parts. With the engine out, the rear crankshaft seal is easy to reach. Fit a new one, inspect the flywheel and clutch on manual cars or the converter seal on automatics.
4. Renew the cooling system. Most engine failures start with cooling. Fit a new water pump, thermostat and hoses, check the radiator and fan, and use the correct coolant.
5. Fit new engine mounts. Old mounts transfer vibration and can let the engine move enough to damage hoses. They are cheap and easy to replace with the engine out.
6. Inspect or replace the timing chain parts. Look at the guides and tensioner. On high-mileage engines, replacing them now costs far less than doing it later.
7. Replace the rear timing chain if in doubt. On engines with the chain at the gearbox end, chain work needs the engine out. If the history is unknown, replace the chain, guides and tensioner before fitting.
8. Prepare the turbo. Fit new oil feed and return seals, clean the intercooler and pipes of any oil or debris from the old engine, and prime the turbo with oil before starting.
9. Code the injectors and bleed the fuel. Enter the injector correction codes into the ECU, check the glow plugs and bleed the fuel system so the engine does not crank dry.
10. Check the particulate filter. If the old engine failed with oil or coolant entering the exhaust, the DPF may be contaminated. Check its back-pressure before relying on it.
11. Clean the intake. If the old engine failed internally, debris can be in the intake or intercooler. Clean them so nothing reaches the new engine.
12. Fill with the right oil and prime it. Fill with new oil of the correct specification and a new filter. Crank with the fuel and ignition disabled until oil pressure builds.
13. Coding and adaptations. On modern BMWs, the engine ECU must be matched to the car's immobiliser (CAS, FEM or BDC). Reset adaptations, register the battery and clear faults with diagnostic software.
14. Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
15. Teach the Valvetronic limit stops. Run the Valvetronic learning routine so the ECU knows the eccentric shaft limits.
16. First start and leak check. Start the engine, let it idle and watch oil pressure, temperature and fault codes. Check for leaks and bleed the cooling system.
17. First 1,000 km. Drive gently for the first few hundred kilometres, vary the engine speed and avoid full load. Change the oil and filter after about 1,000 km to remove any assembly debris.

Diagnosing engine trouble in a BMW F20 and F21 1 Series

If your current engine is showing one of these symptoms, this table helps you judge whether it can be repaired or whether a replacement engine is the better route.

Knocking from the bottom of the engine. A deep knock that rises with engine speed usually means worn rod or main bearings. Stop driving: bearing failure ends with a broken connecting rod. A used engine is normally the most economical fix once the bottom end is damaged.

Overheating or losing coolant. Coolant loss without visible leaks points to a head gasket or a cracked head; visible leaks point to the water pump, hoses, thermostat housing or expansion tank. Overheating should be fixed before it warps the head.

White smoke that smells sweet. Coolant burning in the cylinders, from a head gasket, a cracked head or, on diesels, a leaking EGR cooler. Check the coolant level and look for oil in the coolant.

Blue smoke. Oil burning in the cylinders. A puff on start-up points to valve stem seals; constant smoke under load points to piston rings or, on turbo engines, turbo seals.

Rough idle or misfire. Ignition coils, spark plugs, injectors and vacuum leaks are the usual causes. A misfire on one cylinder that moves when you swap coils is a coil; one that stays is a plug, injector or compression problem.

Loss of power. Start with the simple things: air filter, boost leaks on turbo engines, fuel pressure and fault codes. A gradual loss with poor compression on a test points to internal wear.

Rattle for a few seconds after a cold start. The classic sign of a weak timing chain tensioner or stretched chain. It must be checked quickly: a chain that jumps a tooth can bend valves.

Rattle or whine from the gearbox end. On engines with the timing chain at the rear, a rattle or whine from the back of the engine is the warning sign of chain stretch or guide wear.

Whistle, loss of boost or limp mode. A split charge pipe, a sticking wastegate or worn turbo bearings. Check the pipes first, then the turbo shaft for play.

Black smoke under acceleration. Too much fuel for the air available: boost leaks, a sticking EGR valve, a dirty air mass meter or a leaking injector.

Hard starting when cold. Glow plugs or the glow plug control unit. On older diesels, also check the injection pump and fuel lines for air leaks.

Particulate filter warning. Short trips stop the DPF from regenerating. A long motorway run often clears it; a filter that keeps blocking may be covering an injector, EGR or turbo problem.

Sudden metallic noise followed by misfire. On diesels with swirl flaps, a broken flap or screw can enter a cylinder. Stop the engine immediately; continued running usually destroys the piston and head.

Poor low-down torque and uneven idle. VANOS seals or solenoids. The engine may run well at high revs but feel flat and lumpy at low speed.

Limp mode with a Valvetronic fault. The Valvetronic motor, its eccentric shaft sensor or the wiring. The engine runs on a reduced throttle until it is repaired.

Long cranking before the engine starts. On direct-injection engines, a weak high-pressure fuel pump or leaking injector lets pressure drop when the engine is off.

Repair or replace the engine in your BMW F20 and F21 1 Series?

Repair makes sense when the fault is outside the engine or in a part that can be replaced without opening it: sensors, coils, injectors, gaskets, the water pump or a turbo. Replacement makes sense when the bottom end, the crankshaft, the bores or the head are damaged, because rebuilding an engine properly costs more than a good used unit.

Timing chain work on the engine needs the engine removed. When the chain has failed and damaged valves or pistons, a replacement engine with a sound chain is often the same price as the repair.

Ask your workshop for a written diagnosis before deciding. A compression test, an oil analysis and a borescope inspection take an hour or two and remove most of the guesswork.

Delivery, warranty and payment

Every BMW F20 and F21 1 Series engine we sell is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped before it leaves Hamburg. You receive photographs of the packed engine and a tracking number.

Door-to-door delivery is included to the address you give at checkout. Typical delivery takes three to five working days within Germany and neighbouring countries and five to ten working days to the rest of Europe and the UK.

A 12-month warranty covers eligible internal failure when the engine is fitted by a qualified workshop with new fluids and filters. You can pay by card, bank transfer or crypto and receive the invoice by email straight away.

We deliver BMW F20 and F21 1 Series engines from Hamburg to customers across Europe and beyond. Typical door-to-door times and customs status:

Times are typical for pallet delivery after dispatch and can vary with holidays and remote addresses. Business buyers in the EU with a valid VAT number can order without German VAT.

Questions about BMW F20 and F21 1 Series engines

Will the N47D20C engine fit my BMW F20 120d?

Yes, if your BMW F20 120d was built with the N47D20C. BMW used this 2.0 liter (1,995 cc) diesel engine with 135 kW (184 HP) in the F20 120d from about 2010 to 2015.

In our records the N47D20C is the engine for the F20 120d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F20 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N47 Engines · Search N47D20C in the shop

How much is a replacement N47D20C engine for a BMW F20 120d?

A used N47D20C for the BMW F20 120d costs from about 1.400 € to 2.350 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The N47D20C you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N47 Engines · Search N47D20C in the shop

Will the B37C15 engine fit my BMW F20 116d?

Yes, if your BMW F20 116d was built with the B37C15. BMW used this 1.5 liter (1,496 cc) diesel engine with 85 kW (116 HP) in the F20 116d from about 2015 to 2022.

In our records the B37C15 is the engine for the F20 116d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F20 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B37 Engines · Search B37C15 in the shop

How much is a replacement B37C15 engine for a BMW F20 116d?

A used B37C15 for the BMW F20 116d costs from about 1.150 € to 1.950 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The B37C15 you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B37 Engines · Search B37C15 in the shop

Will the N55B30 engine fit my BMW F20 M135i?

Yes, if your BMW F20 M135i was built with the N55B30. BMW used this 3.0 liter (2,979 cc) petrol engine with 225 kW (306 HP) in the F20 M135i from about 2010 to 2017.

In our records the N55B30 is the engine for the F20 M135i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F20 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N55 Engines · Search N55B30 in the shop

How much is a replacement N55B30 engine for a BMW F20 M135i?

A used N55B30 for the BMW F20 M135i costs from about 3.100 € to 4.850 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The N55B30 you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N55 Engines · Search N55B30 in the shop

Will the N20B20 engine fit my BMW F20 125i?

Yes, if your BMW F20 125i was built with the N20B20. BMW used this 2.0 liter (1,997 cc) petrol engine with 180 kW (245 HP) in the F20 125i from about 2011 to 2017.

In our records the N20B20 is the engine for the F20 125i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F20 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N20 Engines · Search N20B20 in the shop

How much is a replacement N20B20 engine for a BMW F20 125i?

A used N20B20 for the BMW F20 125i costs from about 2.000 € to 3.200 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The N20B20 you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N20 Engines · Search N20B20 in the shop

Will the B38A15 engine fit my BMW F20 118i?

Yes, if your BMW F20 118i was built with the B38A15. BMW used this 1.5 liter (1,499 cc) petrol engine with 100 kW (136 HP) in the F20 118i from about 2014 to 2024.

In our records the B38A15 is the engine for the F20 118i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F20 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B38 Engines · Search B38A15 in the shop

How much is a replacement B38A15 engine for a BMW F20 118i?

A used B38A15 for the BMW F20 118i costs from about 1.250 € to 2.100 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The B38A15 you buy is photographed and checked in Hamburg before it is listed.

Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B38 Engines · Search B38A15 in the shop

Questions about the engines in the BMW F20 and F21 1 Series

Which cars use the BMW B47D20T engine?

BMW fitted the B47D20T to the BMW F30 325d, BMW G30 525d, BMW G01 X3 xDrive25d and BMW F32 425d. These cars were built with this engine from about 2015 to 2022.

The badge on the boot is not enough to be sure. The same model name can hide two different engines, for example after a facelift or a change in emission rules. Always read the engine code stamped on the block, or look it up with your VIN.

Other engines in the same B47 family are the B47D20 (190 HP). They look alike but differ in power, parts and electronics, so they are not always a direct swap.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B47 Engines · Search B47D20T in the shop

Can you check if an N47D20C fits my car with my VIN?

Yes, and it is free. Send the 17-character VIN of your car and, if you have it, the gearbox code. We check the engine family, the build year window and the parts your car needs.

For the N47D20C, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW F30 320d, BMW F31 320d, BMW F10 520d, BMW F11 520d and BMW F20 120d and more.

We only reserve an engine once the match is confirmed, so you never pay for the wrong unit. You can reach the Hamburg desk by email at autowerkeengines@gmail.com, or by phone and WhatsApp on +49 15510 030835, Monday to Friday, 9:00 to 16:00 CET.

You can also use the VIN check on our site. It reads the year, the make, the model and the engine from the public vehicle register.

See all N47 Engines · Search N47D20C in the shop

What comes with a used N20B20 engine?

Each N20B20 is sold as described on its own listing. The yard writes down the parts that are fitted to that unit, such as the turbo, the injectors, the manifolds or the alternator, so you know what arrives.

Some units are long engines with few ancillaries, others are more complete. If you need a part that is not listed, ask the desk. We often have the matching items in the yard.

Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.

On delivery, the carrier brings the pallet to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready.

See all N20 Engines · Search N20B20 in the shop

Will the N47D20A engine fit my BMW E91 320d?

Yes, if your BMW E91 320d was built with the N47D20A. BMW used this 2.0 liter (1,995 cc) diesel engine with 130 kW (177 HP) in the E91 320d from about 2007 to 2012.

In our records the N47D20A is the engine for the E91 320d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E91 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all N47 Engines · Search N47D20A in the shop

Are there other versions of the BMW B37C15?

In our yard the B37C15 is the only listed version of the B37 family. It makes 85 kW (116 HP) and 270 Nm, and was built from 2015 to 2022.

Engines in one family share a basic block, but the turbo, the injection, the sensors and the engine computer can differ. A higher power version often has different pistons, a bigger turbo or a different fuel system.

This is why we ask for the exact code. Fitting a different version can work, but the wiring, the software and sometimes the gearbox must be changed to match.

Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.

See all B37 Engines · Search B37C15 in the shop

Can you check if an N55B30 fits my car with my VIN?

Yes, and it is free. Send the 17-character VIN of your car and, if you have it, the gearbox code. We check the engine family, the build year window and the parts your car needs.

For the N55B30, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW F30 335i, BMW F31 335i, BMW E92 335i, BMW F32 435i and BMW F20 M135i and more.

We only reserve an engine once the match is confirmed, so you never pay for the wrong unit. You can reach the Hamburg desk by email at autowerkeengines@gmail.com, or by phone and WhatsApp on +49 15510 030835, Monday to Friday, 9:00 to 16:00 CET.

You can also use the VIN check on our site. It reads the year, the make, the model and the engine from the public vehicle register.

See all N55 Engines · Search N55B30 in the shop

How long does delivery of a B47D20T engine take?

Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day. Delivery to the Netherlands, Belgium, Germany, France, Luxembourg and Denmark takes 1 to 3 working days.

Spain, Italy, Portugal, Poland, Czechia, Austria, Ireland, the Nordics and the Baltics take 2 to 5 working days. Greek and Spanish islands, Malta, Cyprus and remote areas take 4 to 8 working days. The UK and other countries outside the EU are quoted one by one.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.

You get a tracking number when the pallet is collected. Check the wrapping before you sign, and note any damage on the paperwork.

See all B47 Engines · Search B47D20T in the shop

Glossary

• VANOS — BMW's variable camshaft timing system. It adjusts the intake camshaft (single VANOS) or both camshafts (double VANOS) to improve torque and emissions.
• Valvetronic — BMW's variable valve lift system. It controls engine load with the intake valves instead of a throttle plate, improving economy.
• Direct injection — Fuel is injected directly into the cylinder instead of the intake port. It improves efficiency but can cause carbon build-up on the intake valves.
• Wastegate — A valve that lets exhaust gas bypass the turbine to control boost pressure. Worn wastegates rattle and can cause boost faults.
• DPF — Diesel particulate filter. It traps soot and burns it off during regeneration, which needs longer journeys.
• EGR — Exhaust gas recirculation. It feeds some exhaust back into the intake to reduce NOx emissions but builds up soot.
• Swirl flaps — Flaps in the intake manifold that create swirl at low revs. On some BMW diesels they can break and enter the engine.
• Common rail — A diesel injection system with a high-pressure fuel rail feeding all injectors. It allows precise, multiple injections per cycle.
• Long block — An engine with the block, head and internals but without most ancillaries such as manifolds, turbo, alternator or starter.
• Dressed engine — An engine with most ancillaries fitted, ready to install with fewer parts transferred.
• Compression test — A measurement of the pressure each cylinder builds when cranked. Even readings show healthy rings and valves.
• Leak-down test — A test that pressurises each cylinder and measures how much air escapes, showing where any leak is.
• LCI — Life Cycle Impulse, BMW's name for a mid-life update. Engines often change at the LCI.
• xDrive — BMW's all-wheel-drive system. xDrive cars often use a different sump and oil pickup.
• DME — Digital Motor Electronics, BMW's name for the engine control unit.
• CAS, FEM and BDC — The immobiliser and body modules that must be matched to the engine control unit on modern BMWs.
• Timing chain tensioner — A hydraulic or spring device that keeps the timing chain tight. Worn tensioners cause cold-start rattle.
• Rear-mounted timing chain — A timing chain at the gearbox end of the engine. Replacing it normally requires removing the engine.
• Electric water pump — A water pump driven by an electric motor. It needs a diagnostic bleeding routine when the system is refilled.
• TU — Technical Update, BMW's suffix for a revised version of an engine.

Our verdict

The BMW F20 and F21 1 Series offers a wide choice of engines, and the right replacement depends on your exact model, build date and gearbox. Confirm the code with your VIN, choose a unit with known history, replace the known weak parts while it is out, and the car will be back on the road for years.

See every BMW F20 and F21 1 Series engine in stock, or ask the Hamburg desk to check your VIN.

Model-by-model engine guides

• BMW 116d (F20) engine: which one, problems and replacement
• BMW 120d (F20) engine: which one, problems and replacement
• BMW 118d (F20) engine: which one, problems and replacement