Second Hand BMW X4 Gearbox

The BMW X4 has run across two generations: the F26 (2014–2018) and the G02 (2018–present, facelifted in 2021). These generations use different platforms, engines, and gearbox designs, so a gearbox from an F26 will not cross over to a G02 and vice versa. Within each generation there is more potential for interchange, but always confirm against your exact engine code and registration with the breaker before buying.

This depends on which 2018 model you have, because 2018 sits right on the boundary between the F26 (2014–2018) and the G02 (2018–present). An early 2018 F26 and a late 2016 F26 share the same generation and are more likely to be compatible if the engine codes match, but a 2018 G02 will need a different gearbox entirely. Give the breaker both registrations and your engine code – found on your V5 or a VIN check – so they can confirm which generation and gearbox variant each car carries.

The engine code matters above everything else for a mechanical part like a gearbox – the year alone is not sufficient. BMW fitted the X4 with a range of four-cylinder and six-cylinder petrol and diesel units across the same model years, and these engines pair with different gearbox variants even within one generation. Pull the engine code from your V5C or a VIN check and supply it to the breaker, as that single detail will do more to confirm fitment than any other information you can provide.

Trim level alone does not affect gearbox fitment; what matters is the engine fitted to that trim. An xLine and an M Sport built around the same engine and fuel type will use the same gearbox, so the badge on the tailgate is not a useful guide here. The M40i is a different matter because it uses a distinct six-cylinder engine and a matching gearbox, so if you are sourcing for an M40i you must match engine code to engine code rather than treating it as a like-for-like swap with a four-cylinder car. Always confirm the engine code and fuel type with the breaker against your registration.

No: petrol and diesel variants use different gearbox units, so fuel type is a key fitment filter alongside the engine code and generation. Even where the external casing looks similar, the internals and ratios are matched to the specific engine, and fitting a mismatched unit is likely to cause problems. When contacting a breaker, state clearly that you need a diesel gearbox and supply your engine code so they can source the correct match.

The 2021 facelift updated the G02 cosmetically and brought some equipment changes, but the core platform remained the same generation. Whether a pre-facelift and post-facelift G02 gearbox interchange depends on whether the engine code is identical across both cars, and there may also be ancillary and mounting changes introduced during that mid-production update. Confirm directly with the breaker against both registrations, as these mid-run detail changes are something a specialist dismantler is best placed to verify.