Peugeot 407 Catalytic Converter Replacement Parts

The Peugeot 407 ran from 2004 to 2011 as a single generation, with a facelift arriving in 2008, and catalytic converters follow the engine code and emissions era rather than the body style change. A pre-facelift and post-facelift car sharing the same engine code may use compatible cats, but the emissions regulations tightened across this period and a cat from the wrong era could cause an MOT failure even if it physically bolts on. Always confirm interchange specifics with the breaker against your exact registration number before buying.

No — petrol and diesel Peugeot 407s use completely different exhaust aftertreatment systems and the parts are not interchangeable. Petrol engines use a conventional catalytic converter, while diesel engines use a diesel oxidation catalyst (DOC) that is a fundamentally different component, often paired with a diesel particulate filter (DPF). Make sure you specify your fuel type clearly when requesting a quote from a breaker.

No — trim level does not affect catalytic converter fitment on the 407; trims such as S, SE, Sport, Executive, and SR are cosmetic and equipment grades rather than mechanical distinctions. What matters is the engine code and fuel type, which you can find on the V5C or by giving the breaker your registration. Expect the breaker to ask for those details rather than your trim name.

Diesel 407s do have a diesel oxidation catalyst (DOC), which performs a similar emissions-cleaning role to a petrol catalytic converter but is a different part designed for diesel exhaust chemistry. Many later diesel 407s also have a diesel particulate filter (DPF) alongside the DOC, and these are often sold or sourced as separate components. Confirm with the breaker exactly which component you need and whether your engine has a combined or separate DPF unit, using your registration as the reference.

Yes, engine code is the single most important factor — the 407 was offered with a range of petrol and diesel engines across its 2004–2011 lifespan, and cats are matched to specific engine families rather than to the model as a whole. Using a cat from a different engine, even one of the same fuel type and similar displacement, risks a poor fit or an emissions failure at MOT. Give the breaker your engine code (found on the V5C or stamped on the engine block) alongside your registration to get an accurate match.

The 407 facelifted in 2008, and while the facelift was largely cosmetic, emissions standards and engine tune details can differ across that boundary, meaning a pre-2008 cat is not guaranteed to suit a 2008–2011 car even on the same engine family. Whether a specific cat crosses that 2008 boundary and remains compliant is strong confirm-with-the-breaker territory — provide your registration and engine code and let the breaker check the part numbers. Never assume fitment based on the engine size alone.