BMW 4 Series Engine Replacement Parts

The first-generation 4 Series (F32 coupé, F33 convertible, F36 Gran Coupé) ran from 2013 to 2020, with a facelift in 2017 that brought revised styling and some specification changes. The second-generation 4 Series (G22/G23/G26) launched in 2021 and is a completely different platform. If you're sourcing an engine, confirm which generation your car is before approaching a breaker, as the two share nothing mechanically.

Both a 2015 and a 2018 4 Series sit within the same F-series generation (2013–2020), so the facelift in 2017 was cosmetic and did not introduce new engine families. That said, whether a specific unit crosses the pre- and post-facelift boundary cleanly — particularly ancillary brackets, mounting points, or any mid-cycle running changes — is something you should confirm with the breaker against your registration number. The engine code, which you'll find on your V5C or via a VIN check, is the single most important detail to supply when asking for a quote.

The F32 4 Series shares its platform and engine family with the F30 3 Series (2012–2019), so the engine codes often align directly — for example, the N20B20 2.0-litre petrol and N57D30 3.0-litre diesel appear in both. However, you should always match by engine code rather than model badge, and confirm ancillary fitment details with the breaker, as mounting and cooling configurations can vary between body styles. Supplying your exact engine code gives a breaker everything they need to pull the right unit.

No — trim level has no bearing on engine fitment for the 4 Series. M Sport, SE, and xLine are specification packages that affect interior materials, body styling, and wheel choices, not the engine fitted. What actually determines which engine you need is the engine code, fuel type, and gearbox type (manual or automatic), so don't let a breaker quote you a different part simply because trims differ. Do be aware that a donor car's ancillaries or air-intake routing may look slightly different if it came from a different trim, but the core engine unit is the same.

The engine code is the most critical piece of information for sourcing a used 4 Series engine — it tells the breaker exactly which unit will fit, far more reliably than the year or badge alone. You'll find it on your V5C logbook, or you can run a VIN check through a service such as MyCarCheck or a main dealer. Common codes in the F-series 4 Series range include the B47 2.0-litre diesel, B58 3.0-litre petrol, and N55 3.0-litre petrol, among others — always quote yours precisely rather than relying on engine size alone.

Body style does not affect engine fitment — the 420d engine code is the same whether the donor car is a coupé (F32) or Gran Coupé (F36). What matters is that the engine code, fuel type, gearbox type, and model year all match between donor and recipient. Confirm with the breaker that any ancillary components and mountings align with your specific car using your registration, as minor production changes can sometimes affect what bolts straight in.