Second Hand Alfa Romeo 147 Catalytic Converter

Yes, all Alfa Romeo 147 variants were fitted with a catalytic converter as standard — both the petrol and diesel engines require one to meet emissions regulations and pass MOT. The petrol engines use a conventional three-way catalytic converter, while the diesel engines also have a cat as part of their exhaust after-treatment system. If you're driving a diesel 147 and are also concerned about a particulate filter, confirm with your breaker exactly which component you need, as the two are separate parts.

The Alfa Romeo 147 ran from 2000 to 2010, with a facelift introduced in 2004 that brought some engineering updates alongside the styling changes. The engine code is the primary fitment factor for the catalytic converter, so if both cars share the same engine code and fuel type, fitment is more likely — but whether a specific pre-facelift cat crosses over to a post-2004 facelift car is strong confirm-with-breaker territory, and you should quote your registration to the breaker so they can verify against what they have.

Yes, engine code is one of the most important fitment factors for a catalytic converter — different engines have different exhaust configurations, flange sizes, and emissions calibrations, so a cat from a 1.6 Twin Spark will not be the same as one from a 2.0 Twin Spark or the 1.9 JTD diesel. Always tell your breaker your exact engine code, which you can find on your V5C or by checking the engine bay, alongside your registration. Fitting the wrong cat can cause MOT failure or poor running, so don't assume a visually similar unit from a different engine variant will work.

No — trim level does not affect catalytic converter fitment on the 147; variants like Lusso, Veloce, and Black Line share exhaust systems determined by their engine and fuel type, not their equipment level. When buying from a breaker, ignore the trim of the donor car and focus on matching the engine code and fuel type to your own vehicle. You may find cosmetic differences in surrounding exhaust components from different donor cars, but the cat itself is unaffected by trim.

No — petrol and diesel catalytic converters are completely different components that serve different chemical processes and are not interchangeable. Always make sure the donor car matches your fuel type exactly, and confirm the engine code with your breaker as well, since even within petrol or diesel there are differences between engine variants. Fitting a cat from the wrong fuel type will cause the car to fail its MOT and run incorrectly.

Matching engine codes is a strong starting point, but the year of the donor car still matters because emissions legislation changed across the 147's production run, and a cat calibrated for a different emissions standard may not satisfy your car's requirements or pass MOT even if it physically bolts on. The 2004 facelift is a key boundary worth flagging to your breaker, and you should also tell them your registration so they can check the specific emissions classification of your car against the donor. Catalytic converter interchange specifics are firmly confirm-with-breaker territory, so treat any same-code match as a promising lead rather than a guaranteed fit.