Second Hand BMW 3 Series Catalytic Converter

No — the E46 (1998–2005) and E90 (2005–2012) are separate generations with different engine families, exhaust configurations, and emissions standards, so the catalytic converters are not interchangeable. The E90 era also straddles the Euro 4 to Euro 5 boundary around 2008–2009, adding another layer of complexity even within that generation. Always confirm exact compatibility with the breaker using your full registration number.

The E90 received a facelift in 2008, and while many mechanical components carried over, exhaust and emissions components can differ due to the tightening Euro emissions rules around that period. Whether a specific catalytic converter crosses that 2008 boundary depends on your engine code, and this is strong confirm-with-breaker territory — give them your reg and they can check the exact part numbers involved. Fitting the wrong emissions-era cat could also cause an MOT failure.

Yes — all petrol-engined BMW 3 Series models sold in the UK are fitted with a catalytic converter as standard, as required by emissions regulations. Diesel variants use a different emissions system (typically a diesel oxidation catalyst and DPF rather than a traditional three-way cat), so if you have a diesel 3 Series you should confirm with the breaker exactly which component you need. Either way, your engine code and registration are essential for sourcing the right part.

No — trim level does not affect catalytic converter fitment on the BMW 3 Series; what matters is your engine code and the emissions standard applicable to your car's year of manufacture. An SE and an M Sport sharing the same engine and year will use the same catalytic converter, regardless of any cosmetic or suspension differences between the trims. Confirm the engine code with your breaker to make sure you get the right part.

No — the F30 (2012–2019) and E90 (2005–2012) are entirely separate generations with different engine families, exhaust layouts, and emissions requirements (the F30 is predominantly Euro 6), so the parts are not compatible. Even where engine displacements look similar across generations, the catalytic converter design follows the specific engine code and emissions era of each car. Always supply your registration to the breaker so they can identify the correct generation and spec.

These two cars sit either side of significant emissions-era changes within the E90 generation, and the catalytic converter specifications can differ accordingly, particularly if the engine codes differ between those model years. Whether the specific units interchange is something you must confirm with the breaker against both registrations, as fitting the wrong emissions-era component risks MOT failure. Give the breaker both the donor and recipient engine codes for the most reliable answer.