Cheap Peugeot 408 Lambda Sensor

Yes, petrol-engined Peugeot 408s are fitted with lambda sensors (oxygen sensors) as standard — they sit in the exhaust system and help the ECU manage fuel mixture and emissions. The 408 has been sold in the UK across two distinct generations: the first generation ran from around 2010 to 2014, and the second generation launched in 2023. Diesel variants do not use a traditional lambda sensor in the same way, relying instead on different exhaust gas management components, so if you drive a diesel 408 and are chasing an emissions-related fault, confirm with a breaker or mechanic exactly which sensor you need.

Both the 2011 and 2013 408s sit within the same first-generation model range (2010–2014), and provided the engine code matches — most commonly the 1.6 THP petrol unit — the lambda sensor position and connector type are generally consistent across those years. That said, there were running production changes during this generation, so always match the engine code from your V5 or under the bonnet rather than relying on year alone. Ask your breaker to cross-reference against your registration to be sure.

No, trim level does not affect lambda sensor fitment on the Peugeot 408 — Active, Allure, and GT trims all share the same exhaust and engine management hardware for a given engine. What matters is the engine code and the emissions standard the car was built to, not whether it came with extra kit or a different interior. Tell your breaker your engine code and registration rather than your trim name.

No — the second-generation 408 (2023 onwards) is an entirely different platform using newer engines, including mild-hybrid and plug-in hybrid powertrains, and its lambda sensors will not cross over to the first-generation model (2010–2014). The connector types, sensor thread sizes, and exhaust configurations differ between the two generations. Always source a sensor matched to your specific generation and engine code.

Yes, the emissions standard your engine was built to can affect the number of sensors fitted and their specification — Euro 6 calibration requirements are stricter than Euro 5, and the sensor design may differ accordingly. The first-generation 408 (2010–2014) falls within the Euro 5 era for most of its production run, while the second-generation 408 (2023 onwards) is Euro 6 compliant. When speaking to a breaker, give them your registration so they can confirm the exact emissions homologation and match the correct sensor.

Yes, it matters — the upstream (pre-cat) lambda sensor monitors exhaust gases before the catalytic converter to control fuelling, while the downstream (post-cat) sensor monitors converter efficiency, and the two are different parts with different calibrations. Fitting the wrong one to either position can trigger warning lights and affect fuel economy or cause an MOT emissions failure. Tell your breaker which position you need (upstream or downstream) along with your engine code and registration, and they can supply the correct unit.