Cheap Peugeot 508 Lambda Sensor

Lambda sensors exist on petrol-engined 508s, which use them to monitor exhaust gases and help the ECU manage fuelling — this is standard on petrol engines across both the first generation (2011–2018) and second generation (2018 onwards). Diesel 508s do not use a lambda sensor in the same way; diesels rely on different sensors such as NOx sensors and oxygen sensors further in the exhaust system, so if your 508 is diesel, a lambda sensor is not what you need. If you are unsure which engine you have, check your V5C or registration plate lookup before ordering.

Both years fall within the first-generation 508 (2011–2018), but fitment depends on the engine code rather than the year alone — the 1.6 THP petrol and the older naturally aspirated petrol units can use different sensors in different positions. Provided the engine codes match exactly, a sensor from a 2013 car is worth quoting for, but confirm the specific engine code and sensor position (upstream or downstream of the catalytic converter) with the breaker against your registration before buying.

The first generation ran from 2011 to 2018 and the second generation from 2018 onwards, and the two cars share no common platform or engine family, so a lambda sensor from a Mk1 is very unlikely to be compatible with a Mk2. The second-gen 508 introduced different petrol engines with updated emissions calibration, meaning sensor specifications, connectors, and positioning differ. Always quote separately for each generation and confirm against your exact registration and engine code with the breaker.

Trim level makes no difference to lambda sensor fitment on the 508 — Active, Allure, and GT trims with the same engine code use the same sensor. What matters is the engine code, fuel type, and whether the sensor is the upstream (pre-cat) or downstream (post-cat) unit. Focus on matching the engine code and sensor position rather than the trim badge when getting quotes from breakers.

The first-generation 508 received a facelift in 2014, but this was primarily cosmetic and did not fundamentally change the petrol engine families, so the facelift boundary is unlikely to affect lambda sensor compatibility in isolation. However, because emissions-related components can be updated mid-cycle alongside Euro standard changes, you should confirm the engine code on both donor and recipient cars with the breaker rather than relying on year alone. A breaker will be able to check the specific part number against your registration to be sure.

The 508 shares petrol engine families with other PSA Group models, so there is a possibility of crossover for the same engine code — for example, the 1.6 THP engine appeared across several Peugeot and Citroën models of the same era. However, exhaust routing, connector types, and sensor positioning can vary between body styles even with the same engine, so this is not a straightforward swap. Provide the engine code from both vehicles to your breaker and let them confirm compatibility before purchasing.