Second Hand BMW X4 Catalytic Converter

Both exist depending on engine type: petrol X4 models (such as the xDrive20i, xDrive30i, and M40i) carry a traditional catalytic converter as part of their exhaust system, while diesel variants (xDrive20d, xDrive30d, M40d) use a diesel oxidation catalyst combined with a DPF rather than a petrol-style cat. So yes, if you have a petrol X4, a catalytic converter is a genuine fitment — if you have a diesel, what you may actually need is a diesel oxidation catalyst or DPF, so confirm exactly which component has failed before ordering.

The F26 and G02 are completely different platforms — the F26 ran from 2014 to 2018 and the G02 launched in 2018, bringing new engine families, revised exhaust layouts, and tighter Euro 6 emissions requirements. A cat from an F26 model should not be assumed to fit a G02, even if both are petrol and share a similar engine displacement. Name the generation boundary to your breaker and confirm against your exact registration and engine code, as crossing this boundary is strong confirm-with-breaker territory.

Trim level does not affect catalytic converter fitment on the BMW X4 — the cat is determined by engine code, fuel type, and emissions era, not whether the car wears xLine, M Sport, or Competition badging. You may find cosmetic differences around the exhaust tips or rear valance between trims, but the cat itself upstream of all that is the same across trims sharing the same engine. Focus your search on engine code and model year rather than trim name.

The G02 BMW X4 received a facelift in 2021 which brought updated engines and revised emissions calibration on some variants, meaning the exhaust aftertreatment components were not necessarily carried over unchanged. Whether a pre-facelift and post-facelift G02 cat will interchange depends on the specific engine code and emissions specification of both donor and recipient cars. Confirm this against both registrations with your breaker before purchasing, as this sits firmly in confirm-with-breaker territory.

The F26 X4 shares its platform with the F25 X3, and the G02 X4 shares underpinnings with the G01 X3, so there is a reasonable chance of shared exhaust components on matching engine codes — but exhaust routing, tunnel clearances, and certification can differ between body styles even on shared platforms. This is exactly the kind of cross-model interchange that needs to be confirmed with the breaker against both registrations and engine codes rather than assumed. Never purchase on platform sharing alone.

Both a 2016 and 2017 BMW X4 petrol fall within the F26 generation (2014–2018), so they are in the same generation and emissions era, which is a positive starting point. However, catalytic converter interchange specifics — even within the same generation — are strong confirm-with-breaker territory, so you should match engine codes precisely and have the breaker verify against both registrations before committing to the part.