Second Hand Peugeot 307 ECU

Yes, every Peugeot 307 variant — petrol or diesel, manual or automatic — has an ECU (engine control unit), as it is a fundamental part of the engine management system on all versions of this car. There is no drivetrain layout on the 307 that would lack one, so you are in the right place searching for this part.

The 307 ran from 2001 to 2008, with a facelift arriving in 2005 that brought updates including changes to some engine management systems, so an ECU from a pre-facelift car crossing into the facelift range is not a straightforward swap. The engine code is the single most important detail — if both cars share the same engine code, fuel type, and gearbox type, there is a stronger case for compatibility, but whether the specific ECU variant changed at the facelift boundary is something you must confirm with the breaker against your registration. Always supply your engine code (found on your V5 or via a VIN check) when requesting a quote.

Trim level does not affect ECU fitment on the 307 — the ECU follows the engine and gearbox, not the badge on the boot. An S, LX, XT, or any other trim variant fitted with the same engine code and gearbox type as your car is what matters, so do not limit your search by trim name. Be aware that different trims may have had different engine options as standard, so always match on engine code first.

Yes, petrol and diesel 307s use entirely different ECUs, so you must only source a unit from a matching fuel type. Beyond that, the specific HDi engine code matters too — for example, the 1.6 HDi and 2.0 HDi use different units — so confirm your exact engine code from the V5 or a VIN check before approaching a breaker. Supplying that code upfront will save significant time.

Gearbox type is a key fitment variable for an ECU, so a unit from an automatic 307 is unlikely to be a direct match for a manual car even if the engine code is the same. Confirm this point explicitly with the breaker, supplying both your engine code and gearbox type, before agreeing a purchase.

This is an important practical consideration — ECUs on the 307 are typically paired to the vehicle's immobiliser system, which means a used unit will very likely need to be coded or programmed to work correctly in your car. This process usually requires specialist diagnostic equipment and may need to be carried out by a Peugeot dealer or auto-electrician; confirm the exact requirements with the breaker when you get your quote, as the coding situation can vary.