Used BMW X4 Air Filter

Every BMW X4 has an air filter regardless of engine variant — petrol, diesel, or the M40i — because all internal combustion engines require filtered air intake, so this is a universal part across the range. The specific filter housing design and filter element shape will differ between engine families, so the engine code is what actually determines which unit you need, not simply the fact that the car has one.

Almost certainly not — the F26 and G02 are entirely different platforms with different engine families and air intake architectures, so the filter elements and housings are not interchangeable. The F26 generation ran from 2014 to 2018 and the G02 launched in 2018, so if your car sits on that boundary you should confirm which generation you have via your V5 or a VIN check before ordering. Always confirm the specific part number with the breaker against your registration to be certain.

Both years fall within the first-generation F26 (2014–2018), so provided the engine codes match, there is a strong chance the filter will interchange. The engine code is the most reliable guide here — it appears on your V5 or can be found via a VIN check — and you should supply it to the breaker so they can confirm the part before purchase.

Yes, different engine variants use different air filter elements and housings even within the same generation, so an xDrive20d (typically a four-cylinder diesel engine code B47 in the G02 generation) and an xDrive30d (a six-cylinder diesel, typically B57) will not share the same filter. Always check your engine code from your V5 or a VIN check and pass it to the breaker — matching on engine code rather than just the xDrive badge is the reliable approach.

Trim level makes no difference to air filter fitment — M Sport, xLine, and M Competition are trim and styling packages that do not alter the engine or its air intake system. What matters is the engine code, fuel type, and generation, so a used filter from any trim level of the same engine variant should be mechanically equivalent. Your breaker will confirm against your registration to be sure.

The X4 M Competition uses the S58 engine while the M40i uses the B58, so these are different engines with different air intake setups and the filters are unlikely to be interchangeable. Supply your exact engine code to the breaker — it is the single most useful detail you can provide — and they will be able to confirm whether a specific used unit from their stock is the right match for your car.