Peugeot 307 Catalytic Converter Replacement Parts

The catalytic converter exists on all petrol variants of the Peugeot 307, which ran from 2001 to 2008 with a facelift in 2005, so there is a reasonable pool of used parts available. Fitment depends heavily on the engine code rather than the model year alone, as different petrol units — such as the 1.4, 1.6, and 2.0 — each have their own exhaust configuration. Always confirm the engine code from your V5C against the donor vehicle before buying, and check this with the breaker against your registration to be sure.

The 307 received a facelift in 2005 but the core engine lineup carried across with relatively few changes, so a cat from the same engine code on either side of that boundary could potentially be compatible. However, catalytic converter interchange across a production boundary is strong confirm-with-breaker territory — emissions calibration and pipe dimensions can differ even when engines appear identical. Give the breaker your registration and ask them to match engine code to engine code before committing.

Diesel 307s do have a catalytic converter, typically integrated with or positioned alongside a diesel particulate filter (DPF) on later or higher-specification diesel variants. The exact arrangement depends on the engine variant and the emissions standards applicable to that vehicle's year of manufacture. Because cat and DPF interchange on diesel units is particularly complex, you must confirm the correct part with the breaker using your exact registration number.

Trim level — whether your 307 is S, LX, SE, or any other grade — has no bearing on which catalytic converter you need. What matters is the engine code and fuel type, both of which are shared across trims fitted with the same engine. Focus your search on matching those details rather than trim name, and the breaker will be able to cross-reference against your registration to confirm.

The 307 shares some platform and engine architecture with other Peugeot models of the era, but catalytic converters are not straightforwardly interchangeable across different model lines even where engine codes match, because pipe routing, mounting positions, and emissions tuning can all differ. Sourcing a cat that is listed specifically for the 307 with your engine code is the safest approach. Run any cross-model suggestion past the breaker with your registration before purchasing.

A used catalytic converter can pass an MOT provided it is the correct unit for your engine and emissions specification and is not damaged or excessively worn. Fitting a cat from the wrong engine code or emissions era risks failing the MOT emissions test even if it physically bolts on. Have the breaker confirm the part matches your registration and engine code, and consider having it checked by a mechanic before the test if you have any doubt.