Used BMW X4 Engine

The engine code is the single most important detail for fitment — more reliable than the year or badge alone. You can find your engine code on your V5C logbook or by running a VIN check, and it will be something like B47, B57, B46, or B58 depending on your fuel type and output. Always give this code to the breaker when requesting a quote, as two X4s from the same year can carry different engines depending on the variant. Never assume fitment from the model name alone.

The BMW X4 ran as the F26 from 2014 to 2018, then moved to the all-new G02 platform from 2018 onwards — these are significantly different generations with different engine architecture, mountings, and management systems. An engine from an F26 is not a straightforward swap into a G02, and the two generations should be treated as incompatible for a like-for-like engine replacement. Confirm the generation of both donor and recipient vehicles with the breaker using your full VIN before proceeding. Mixing generations is not recommended.

The G02 X4 received a facelift in 2021, and while the generation name is the same, there can be ancillary, mounting, and ECU-related differences introduced mid-production that are not always obvious from the outside. The engine code is your best guide — if the donor and recipient share the same code, fitment is much more likely, but you should still confirm any mid-production changes directly with the breaker against your specific registration. ECU pairing and immobiliser coding are also factors your installer will need to address. Do not assume a clean swap without checking.

Yes, this matters significantly — the xDrive20d and xDrive30d use different engine codes (for example B47 versus B57 in the G02 generation) and are not interchangeable. Fuel type, displacement, and output all tie back to the engine code, so always match the code rather than trying to cross from one variant to another. Swapping to a different code is a substantial engineering and legal undertaking, not a like-for-like replacement. Stick to the same engine code as your original for a used engine swap.

Trim level — whether your X4 is xLine, M Sport, or M Sport X — does not affect engine fitment; these are cosmetic and equipment packages rather than mechanical distinctions. The engine code, fuel type, and gearbox type are what govern compatibility, not the trim badge. One thing worth noting is that an engine from a different trim donor car may arrive with different ancillaries or brackets, so confirm with the breaker whether everything you need is included. The trim name on the donor vehicle can be ignored for the purposes of engine matching.

Petrol and diesel engines are entirely different units with different management systems, ancillaries, fuel systems, and in many cases gearbox pairings, so this is not a viable like-for-like replacement. For a used engine swap on Findapart, you should always be sourcing the same fuel type and matching engine code as your original. Confirm your fuel type and engine code from your V5C or a VIN check before contacting breakers. Only request a quote for a matching unit.