BMW 8 Series Catalytic Converter Replacement Parts
Need a used BMW 8 Series catalytic converter? Request a free quote from UK vehicle dismantlers and compare offers direct.
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Choosing the right used BMW 8 Series catalytic converter
Used catalytic converters vary between vehicles - and whether you call it used, second hand or a replacement, matching the right one matters. These are the details breakers need to match the right part to your car - our request form asks them so you only hear from suppliers with the correct part:
- State whether it's petrol or diesel
- State the engine code if known
Other used BMW 8 Series parts
- Used BMW 8 Series DPF
- Used BMW 8 Series EGR Valve
- Used BMW 8 Series Lambda Sensor
- Used BMW 8 Series Exhaust System
- Used BMW 8 Series Flywheel
- Used BMW 8 Series Shock Absorber
- Used BMW 8 Series Starter Motor
- Used BMW 8 Series AC Compressor
- Used BMW 8 Series Door
- Used BMW 8 Series Sump
- Used BMW 8 Series Wing Mirror
- Used BMW 8 Series Throttle Body
Used catalytic converter for other BMW models
Fitment questions
Does a BMW 8 Series have a catalytic converter?
Yes, all petrol-engined BMW 8 Series models carry catalytic converters as part of their exhaust after-treatment system, and this applies across both the original E31 generation (1990–1999) and the current G15/G14/G16 generation (2018-onwards). Diesel variants in the current generation use a diesel oxidation catalyst (DOC) as part of their after-treatment system rather than a traditional three-way catalytic converter, and also carry a diesel particulate filter (DPF). If you are unsure which system your car has, confirm with the breaker against your registration before ordering.
Will a catalytic converter from an early G15 840i fit my later G15 840i — does the build year matter?
The current 8 Series G15 coupe launched in 2018 and all examples use the B58 turbocharged straight-six engine in 840i spec, but emissions calibration and exhaust system specification can vary between production years, particularly around Euro 6 compliance updates. A cat from a different model year may look identical but could carry different part numbers or internal formulations. Because catalytic converter interchange specifics are strong confirm-with-breaker territory, always check the supplying breaker has matched to your exact registration and engine code before buying.
Does the trim level affect which catalytic converter I need — for example, does an M Sport need a different cat to a standard 840i?
No, trim level does not affect catalytic converter fitment on the BMW 8 Series — M Sport, Sport and standard trims share the same engine and exhaust architecture, so the trim badge is irrelevant when sourcing a used cat. What matters is the engine code, fuel type, and emissions standard the car was built to. The breaker will need your registration or engine code to confirm the correct unit, not your trim level.
Is the catalytic converter on the 840d diesel the same as on the 840i petrol?
No — petrol and diesel variants use fundamentally different exhaust after-treatment systems and the parts are not interchangeable. The 840d uses a diesel oxidation catalyst and diesel particulate filter setup, while the 840i petrol uses a three-way catalytic converter. Always tell the breaker your fuel type and engine code, as supplying the wrong type would result in an MOT emissions failure.
Will a catalytic converter from the older E31 8 Series (1990–1999) fit the current G15 8 Series (2018-onwards)?
No — the E31 and G15 generations are entirely different platforms separated by nearly two decades of engineering and emissions legislation, and their exhaust systems are completely incompatible. The E31 predates Euro 5 and Euro 6 emissions standards, while the G15 must comply with modern Euro 6 requirements, meaning a cat from the older car would almost certainly cause an MOT emissions failure even if it could be physically mounted. Always source a cat from the same generation as your car and confirm the specific part with the breaker against your registration.
Can I use a catalytic converter from an M850i on my 840i, or do the different engines mean they won't interchange?
The M850i uses a different engine from the 840i — the M850i is powered by the N63 twin-turbocharged V8, while the 840i uses the B58 straight-six — meaning the exhaust systems, including the catalytic converters, are not directly interchangeable. Engine code is one of the most important factors for cat fitment, and mixing systems from different engine families would be incorrect. Confirm your engine code with the breaker who can check the part against your specific registration to ensure the right unit is supplied.