Used Peugeot 407 Lambda Sensor

Yes, but only on petrol-engined 407s — the 1.8, 2.0, 2.2, and 3.0 V6 petrol variants all use lambda sensors as part of their exhaust and engine management systems. Diesel 407s (the 1.6 HDi, 2.0 HDi, and 2.7 HDi) do not use lambda sensors in the same way, as diesel combustion works differently and those engines manage emissions through other means such as EGR and DPF systems. If you drive a diesel 407 and are chasing an emissions or fuelling fault, speak to a breaker or specialist about what sensor your specific engine actually uses.

The 407 ran from 2004 to 2011, with a facelift introduced in 2008 — the pre-facelift and facelift cars share the same basic petrol engine family, so on paper the same engine code often means the same sensor. However, confirm the exact engine code and sensor position (upstream or downstream of the catalytic converter) with the breaker before buying, as exhaust system revisions across that boundary can affect which sensor fits which location. Never assume a pre-facelift part crosses to the facelift without checking your registration against the breaker's donor vehicle.

No, trim level makes no difference to lambda sensor fitment on the 407 — SE, SR, GT, and Executive variants with the same petrol engine and engine code will use the same sensor. What matters is the engine code and the sensor's position in the exhaust (pre-cat or post-cat), not whether the car has leather seats or different alloys. Just make sure you and the breaker agree on the engine code and sensor location when sourcing a used part.

Yes, this is one of the most important things to get right — the upstream (pre-cat) sensor reads the exhaust gases coming straight from the engine and is a different type to the downstream (post-cat) sensor, which monitors catalytic converter efficiency. On a petrol 407 there will typically be at least two sensors, and they are not interchangeable with each other even if they come from an identical engine. Tell the breaker clearly which position you need, and if possible quote your engine code so they can match the donor vehicle accurately.

Engine code is the key fitment factor for lambda sensors, and a different engine code means a different exhaust and fuelling setup, so fitment is not guaranteed even if the sensor looks identical and the plug appears to match. On the 407 petrol range there are several engine variants, and mixing sensors across different codes risks poor running, fault codes, or a failed MOT emissions test. Always match the engine code from the donor vehicle to your own before buying from a breaker.

The 407 was sold as a saloon, estate (SW), and coupé, and where the petrol engine code is identical across those body styles the lambda sensor itself should be the same part. Body style on its own does not affect which lambda sensor is fitted — the engine and its associated exhaust sensors are what matter. Confirm the engine code matches between the donor coupé and your car with the breaker, and you should be on safe ground.