Peugeot 308 Catalytic Converter Replacement Parts

The Peugeot 308 Mk1 ran from 2007 to 2013, so both years sit within the same generation, which is a good starting point. However, fitment depends heavily on the engine code — the 308 was offered with a range of petrol and diesel engines across that period, and a cat from a different engine variant is unlikely to fit correctly even within the same generation. Confirm the engine code on both cars with the breaker against your registration before buying.

The Peugeot 308 Mk2 launched in 2013 and represents a completely different platform from the Mk1 (2007–2013), so a catalytic converter from across that generational boundary is very unlikely to be a direct fit. Emissions regulations also shifted across that period, meaning a Mk1 cat may not meet the requirements of a Mk2-era engine and could cause MOT issues. Treat these as separate searches and confirm compatibility with the breaker against both registrations.

Yes, all Peugeot 308 variants — petrol and diesel — are fitted with a catalytic converter as part of the exhaust emissions system. Petrol engines use a conventional three-way cat, while diesel engines combine a cat with a diesel particulate filter (DPF), often in a close-coupled assembly. If your 308 is diesel, you need to be clear with the breaker about whether you need the cat section, the DPF, or the combined unit.

Trim level — whether that's Access, Active, Allure, SR, GT Line, or any other — does not affect which catalytic converter is fitted; the cat follows the engine and emissions specification, not the trim. What matters is the engine code and the model year, which together determine which emissions standard the car was built to. Focus on matching those details with the breaker rather than the trim badge.

Euro 5 emissions requirements became mandatory for new car registrations in the UK from January 2011, and a cat from an earlier Euro 4 car may not perform to the same standard — potentially causing a failed emissions test at MOT. Even within the Mk1 generation (2007–2013), the engine code and emissions era must align between the donor car and your vehicle. This is strong confirm-with-breaker territory — give them your exact registration and ask them to match the emissions specification of the part.

On many Peugeot 308 diesel engines the catalytic converter and diesel particulate filter are packaged as a close-coupled assembly, meaning a used part from a breaker may come as a combined unit rather than separate components. Whether you need the full assembly or just one section depends on your specific fault, so it's worth getting a diagnosis first. When contacting a breaker, give them your registration and engine code and ask them to confirm exactly which section the part covers, as interchange specifics vary between engine variants and model years.