Used Peugeot 408 Cylinder Head

The engine code is the single most important detail when sourcing a used cylinder head for your 408 — it matters far more than the year or trim level. You'll find the engine code on your V5C logbook or via a VIN check, and you should give this to the breaker when requesting a quote. Matching on engine code ensures you're comparing like-for-like internally, which is critical for a precision component like a cylinder head.

The Peugeot 408 (third-generation, launched in the UK from 2023) is a relatively new model with a tight production window so far, but mid-production ancillary or mounting changes can occur even within a single generation. Share your exact engine code and registration with the breaker, who can confirm whether a specific donor head matches your vehicle before you commit. Never assume year-to-year compatibility without that check.

Yes — fuel type fundamentally affects cylinder head design, and a petrol head will not interchange with a diesel head under any circumstances. The 408 has been offered with both petrol and plug-in hybrid (PHEV) powertrains in the UK market, so you must confirm your exact fuel type and engine code when requesting quotes from breakers. Giving the breaker your engine code removes any ambiguity.

Trim level — whether Allure, Allure Premium, GT, or any other — does not affect cylinder head fitment; this is a mechanical part governed entirely by the engine code. Two 408s in different trims but sharing the same engine code will use the same cylinder head. You may receive ancillary components alongside the head that carry trim-related differences cosmetically, but the head itself is trim-neutral — confirm any extras with the breaker against your registration.

It may well be compatible if the engine codes match, since both fall within the current 408 generation, but production changes to ancillary fittings or coolant routing can occur at any point within a generation without a formal facelift. The safest approach is to give the breaker your exact engine code and full registration so they can verify the specific casting and any associated hardware before you buy. A cylinder head is not a cheap repair to redo if the part turns out to be subtly different.

If the engine code is genuinely identical, the core cylinder head casting may well be shared across PSA/Stellantis platforms — the 408 shares powertrains with other Peugeot models using the same engine family. However, ancillary ports, sensor positions, and mounting points can vary between vehicle applications even with the same base engine, so you must confirm compatibility with the breaker against both registrations before purchasing. This cross-model route can be a good way to find stock, but the breaker needs to verify the specifics.