Peugeot 408 Catalytic Converter Replacement Parts

Yes, all petrol-engined Peugeot 408s are fitted with a catalytic converter as standard, as petrol engines require a cat to reduce harmful emissions and pass MOT. The 408 is available in petrol variants and the cat is part of the exhaust system on every one of them. If you have a diesel 408, the primary emissions control device is a diesel particulate filter (DPF) rather than a traditional catalytic converter, though diesel models may also have a separate oxidation catalyst — confirm with the breaker exactly which component you need against your registration.

The Peugeot 408 (first generation, produced from around 2011 onwards) underwent updates during its production run, and a 2013 to 2015 swap crosses a period where emissions calibration and engine spec changes may affect whether the cat is a direct match. The key thing to check is whether both cars share the same engine code, as the cat is matched to the engine and its emissions tune rather than the model year alone. A visually similar cat from the wrong emissions era could fit physically but potentially cause issues with emissions readings at MOT. Confirm the engine codes on both vehicles with the breaker before purchasing.

No — trim level does not affect which catalytic converter fits your Peugeot 408. Whether your car is an Active, Allure, or GT Line trim, the cat is determined by the engine code and the emissions standard the car was built to, not the interior or equipment specification. You may find cosmetic differences around the exhaust tip area between trims, but the cat itself will be the same across trims sharing the same engine. Always cross-reference the engine code with the breaker to confirm the correct part.

Yes, this matters significantly — a cat built to a different emissions standard may not bring your car within the correct limits for its MOT emissions test, even if it physically bolts on. Euro 5 and Euro 6 catalysts are calibrated differently, and fitting the wrong one could result in a failed emissions test. Your registration number will confirm which standard your car was built to, so share that with the breaker when getting a quote. This is strong confirm-with-breaker territory, so always verify the specific part against your reg before buying.

This is not recommended — the catalytic converter is matched to the specific engine it came from, as the catalyst formulation, sizing, and exhaust flow characteristics are all tuned to that engine's output and emissions profile. Fitting a cat from a different engine variant, even within the same 408 model range, risks poor emissions performance and a potential MOT failure. Always supply the breaker with your exact engine code (found on your V5C or visible on the engine block) to ensure the part corresponds correctly. Never assume a cat from a larger or smaller engine will be interchangeable.

No — these are two different components serving different purposes. The catalytic converter on a petrol 408 converts harmful gases like carbon monoxide and hydrocarbons into less harmful emissions, while a diesel particulate filter on a diesel 408 traps soot particles from the exhaust. They are not interchangeable and are entirely different parts. If you are unsure which emissions control component your car needs, confirm with the breaker using your registration number so they can identify the correct part for your exact drivetrain.