Used Peugeot 206 Lambda Sensor

Yes, but only on petrol variants — the lambda sensor (also called an oxygen sensor) sits in the exhaust and helps the ECU manage the fuel-air mixture on petrol-engined 206s. Diesel 206s, including the 1.4 HDi and 2.0 HDi, do not use a lambda sensor in the same way and instead rely on different emissions management systems. If you have a diesel 206 and are chasing an emissions or running fault, speak to a breaker about what sensors are actually fitted to your engine rather than searching for a lambda sensor.

The 206 ran from 1998 through to 2009, with a facelift arriving around 2002-2003 that brought some engine and emissions updates, and later models moved closer to Euro 3 and Euro 4 compliance depending on year and engine. The lambda sensor follows the engine code and emissions calibration, so even though the exhaust layout can look similar across the run, a sensor from the wrong emissions era may cause fault codes or fail to read correctly. Name your engine code (for example 1.1i TU1, 1.4i TU3, 1.6i TU5 or 2.0i EW10) to the breaker and confirm the sensor matches that code and the same pre- or post-facelift specification rather than just matching on year alone.

Trim level — whether LX, GLX, Roland Garros, S16 or GTi — does not affect lambda sensor fitment; what matters is the engine code under the bonnet. A 1.6i TU5 in a Roland Garros and the same engine in an LX will use the same sensor, while a 2.0i 16v EW10 in a GTi or S16 needs the sensor correct for that engine. Tell the breaker your engine code and registration rather than your trim name, and be aware that a sensor pulled from a different-looking trim car is fine as long as the engine codes match.

Most petrol 206s have one lambda sensor positioned before the catalytic converter (the pre-cat or upstream sensor), though some later or higher-specification engines may also have a post-cat (downstream) sensor to monitor catalyst efficiency for Euro 3 and Euro 4 compliance. Whether your car has one or two depends on its engine code and the year of manufacture, so it is worth checking your existing exhaust before ordering to confirm the position — pre-cat and post-cat sensors are not interchangeable even though they can look identical. Ask the breaker to specify whether the sensor they are supplying is the upstream or downstream unit for your particular engine code.

No — diesel engines including the 2.0 HDi do not use a conventional lambda (oxygen) sensor as part of their emissions management, so if you own a diesel 206 you will not find this part on the car. If you are chasing a fault related to exhaust emissions or fuelling on a diesel, the sensors involved are more likely to be a temperature sensor, a pressure sensor or related to the EGR system rather than a lambda sensor. A breaker who specialises in Peugeot diesel parts will be able to point you toward the correct component for your engine.

A used lambda sensor from the correct engine code and emissions era for your 206 gives you the best chance of restoring proper fuel-air control, but a worn or failing used sensor can still cause an emissions failure, so condition matters as much as specification. The sensor must match your engine code and, where relevant, its upstream or downstream position, since fitting a post-cat sensor in the pre-cat position will not manage combustion correctly. It is also worth confirming with the breaker that the catalytic converter on your car is in good health, as a good sensor on a failing cat will still produce a poor emissions result — cat interchange specifics are something to verify against your registration directly with the breaker.