BMW 320d (G20) engine: which one, problems and replacement

The BMW 320d in the seventh 3 Series generation (G20, built 2018–) was built with 2 different engines over its life: the B47D20 (190 hp, 2014–2026) and the B47D20B (190 hp, 2014–2026).

This guide tells you which engine your 320d has, what goes wrong with it, what a replacement costs from our stock and what else to plan for when you fit one.

• Generation: seventh 3 Series, 2018–
• Body styles: G20 (saloon)
• Engines: B47D20, B47D20B
• Output: 190 hp
• Replacement engines in stock: 277 from 887,00 €

Which engine is in your 320d?

B47D20 in the 320d

The B47D20 was used in the G20 320d, built 2014–2026. It is a 2.0 L turbocharged diesel inline-4 with 190 hp and 400 Nm. It has the same output as the B47D20B, so the build date decides which one your car has.

Reading the code: B marks a B-series code, BMW's modular engine family introduced from 2013 with 500 cc per cylinder; 47 is the family number; D stands for diesel, longitudinal installation for rear-drive and xDrive cars; 20 is the capacity in decilitres, so 2.0 litres.

B47D20B in the 320d

The B47D20B was used in the G20 320d, built 2014–2026. It is a 2.0 L turbocharged diesel inline-4 with 190 hp and 400 Nm. It has the same output as the B47D20, so the build date decides which one your car has.

Reading the code: B marks a B-series code, BMW's modular engine family introduced from 2013 with 500 cc per cylinder; 47 is the family number; D stands for diesel, longitudinal installation for rear-drive and xDrive cars; 20 is the capacity in decilitres, so 2.0 litres; B identifies the version or output stage.

Other cars with the same engine as the 320d

A replacement engine does not have to come from another 320d. These models left the factory with the same engine code, so a unit from any of them is a candidate donor once the sump, mounts and ancillaries are matched to your car.

B47D20: BMW F30 320d, BMW G30 520d, BMW G01 X3 20d, BMW G05 X5 25d.

B47D20B: BMW F30 320d, BMW G01 X3 20d.

How to confirm your engine code

Because the 320d used more than one engine, the badge alone does not tell you which one your car has. The build date is the first clue; the VIN is the proof. Send us the last seven characters of the VIN and we read the engine code from BMW's records, or look for the code stamped on the block. How to find your BMW engine code.

Known 320d engine problems

The B47D20 and B47D20B in the 320d share the known weak points of the B47 family. Full B47 guide.

EGR cooler. BMW recalled many B47 cars to replace the EGR cooler, which could leak and cause a fire risk.

Diesel particulate filter. The DPF clogs on short-trip cars.

Injectors. Injectors leak or fail.

Symptoms to watch for on the 320d

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.

Looking after the 320d engine

• Oil: 0W-30 or 5W-30 BMW Longlife-04, about 5.25 litres.
• Service interval: Oil every 15,000 km or yearly.
• Timing drive: Timing chain at the rear (gearbox end).
• Workshop notes: Check front-drive (B47C) or rear-drive (B47D) before ordering.

Buying a used engine for the 320d: checklist

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.

BMW 320d replacement engine cost

Our 320d engine stock runs to 277 units, priced from 887,00 € to 4.242,00 € with a median of 2.830,00 €.

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.

320d engine prices by model year

Engines from 2005–2009 have a median of 3.015,00 €, while units from 2020–2024 sit at 1.724,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

320d 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.

5 of these come from G20 donor cars, priced from 887,00 € to 4.242,00 €. An engine from the same body is the most direct swap because the sump, mounts and ancillaries already match.

On top of the engine, budget for the workshop's labour and the parts that are best replaced while the engine is out: engine mounts, the rear main seal, cooling parts, a clutch or converter seal, fluids and filters.

Replacement engines in stock for the 320d

Here is a selection of 320d engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW G20 320d B47D20B Engine 20193.849,00 €BMW 325d G20 B47D20B Engine 20201.724,00 €BMW 325d G20 B47D20B Engine 20194.242,00 €BMW G20 320d B47D20B Complete Engine1.703,00 €BMW 325d G20 B47D20B Engine 2021 · 125,000 km887,00 €

BMW G20 320d B47D20B Engine 2019 — 3.849,00 €, reduced from 4.250,00 €. It comes from a 2019 donor car, and 28 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW 325d G20 B47D20B Engine 2020 — 1.724,00 €, reduced from 2.300,00 €. It comes from a 2020 donor car, and 16 units are available. The listing shows every side of the engine and the fitted parts.

BMW 325d G20 B47D20B Engine 2019 — 4.242,00 €, reduced from 4.500,00 €. It comes from a 2019 donor car, and 8 units are available. We can confirm fitment against your VIN the same day.

BMW G20 320d B47D20B Complete Engine — 1.703,00 €, reduced from 2.300,00 €. It comes from a recorded donor car, and 9 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW 325d G20 B47D20B Engine 2021 · 125,000 km — 887,00 €, reduced from 1.150,00 €. It comes from a 2021 donor car with 125,000 km, and 27 units are available. The listing shows every side of the engine and the fitted parts.

Will it fit my 320d?

Will the B47D20B fit my BMW G20 320d?

For the BMW G20 320d, the B47D20B is the factory engine and the one to order. The seventh 3 Series was built 2018–, and the B47D20B was produced 2014–2026, 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 G20 320d?

We have 5 B47D20B engines from G20 donor cars, priced from 887,00 € to 4.242,00 €. 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 swaps and upgrades for the 320d

These engines were fitted to other versions of the G20 at the factory, which makes them the most practical upgrades: the body was designed around them and many parts are shared.

Can I fit the B48B20 in my 320d?

It is a full conversion: the B48B20 runs on petrol and the B47D20B on diesel, so the fuel system, wiring, engine control unit, instrument coding and usually the gearbox change too. The gain is 68 hp and 0 Nm. In Germany and most of Europe an engine swap must be inspected and registered.

Can I fit the B48B20TU in my 320d?

It is a full conversion: the B48B20TU runs on petrol and the B47D20B on diesel, so the fuel system, wiring, engine control unit, instrument coding and usually the gearbox change too. The gain is 68 hp and 0 Nm. In Germany and most of Europe an engine swap must be inspected and registered.

Can I fit the B48B20B in my 320d?

It is a full conversion: the B48B20B runs on petrol and the B47D20B on diesel, so the fuel system, wiring, engine control unit, instrument coding and usually the gearbox change too. The gain is 68 hp and 0 Nm. In Germany and most of Europe an engine swap must be inspected and registered.

Fitting a replacement engine in the 320d

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.

The full fitting and first-start procedure.

320d engine questions

How much is a replacement B47D20 engine for a BMW F48 X1 xDrive20d?

A used B47D20 for the BMW F48 X1 xDrive20d costs from about 2.150 € to 3.450 € 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 B47D20 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 B47 Engines · Search B47D20 in the shop

What is the difference between the B47D20 and other B47 engines?

The B47D20 makes 140 kW (190 HP) and 400 Nm. The other B47 engines are: B47D20T with 170 kW (231 HP) and 500 Nm (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 B47 Engines · Search B47D20 in the shop

What comes with a used B47D20 engine?

Each B47D20 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 B47 Engines · Search B47D20 in the shop

Will the B47D20 engine fit my BMW G01 X3 xDrive20d?

Yes, if your BMW G01 X3 xDrive20d was built with the B47D20. BMW used this 2.0 liter (1,995 cc) diesel engine with 140 kW (190 HP) in the G01 X3 xDrive20d from about 2014 to 2023.

In our records the B47D20 is the engine for the G01 X3 xDrive20d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 B47D20 in the shop

Does a used B47D20 engine come with a warranty?

Yes. 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.

The warranty does not cover damage from wrong fitting, overheating, low oil, wrong fluids or fuel, engines that were opened or modified without our approval, or labour and towing costs.

To claim, send us your order number, a short description of the problem, photos or a video, and a mechanic's report if we ask for one. If the claim is approved, we repair, replace or refund the engine.

Keep the receipts for the fitting, the oil and the filters. They make any claim quick and simple.

See all B47 Engines · Search B47D20 in the shop

Will the B47D20 engine fit my BMW F48 X1 xDrive20d?

Yes, if your BMW F48 X1 xDrive20d was built with the B47D20. BMW used this 2.0 liter (1,995 cc) diesel engine with 140 kW (190 HP) in the F48 X1 xDrive20d from about 2014 to 2023.

In our records the B47D20 is the engine for the F48 X1 xDrive20d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 B47D20 in the shop

Delivery, warranty and payment

Every 320d 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.

All G20 engines · B47 engine guide · BMW 320d engines for sale · Send us your VIN