Genuine 0258006026 Oxygen Sensor
Direct-fit O2 oxygen sensor for PEUGEOT 406 Saloon, PARTNER Box, 406 Coupe, 407 RANCH, and compatible vehicles. This lambda sensor ensures optimal engine performance and emissions control.
About Oxygen Sensors
An oxygen sensor detects the amount of oxygen in a vehicle's exhaust system and sends a signal to the Engine Control Unit (ECU), which adjusts the amount of fuel delivered to the combustion chamber.
Too much oxygen in the exhaust or too little fuel being fed to the engine indicates a lean mixture, which can cause performance problems.
Too little oxygen or too much fuel in the exhaust indicates a rich mixture, which results in lower MPG and excess emissions.
Either condition can shorten the life of the catalytic converter, which removes harmful pollutants from the exhaust.
Almost all gasoline powered vehicles since 1986 have at least one oxygen sensor, and vehicles manufactured since 1996 will have at least two. There is one sensor located before the catalytic converter to communicate with the Engine Control Module (ECM) to let the car know if it needs to use more or less fuel. A second sensor is located after the catalytic converter to make sure that the catalytic converter is working properly.