Oxygen Sensors and Your Car


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The Oxygen Sensor is a small electronic device that is located in the combustion exhaust manifold of a modern vehicle engine.


A vehicle’s engine management computer relies on accurate information in order to automatically adjust the air fuel mixture to an optimal level. As the name implies, the Oxygen Sensor is designed to detect and measure the amount of oxygen that is being expelled in the exhaust gas and send this information to the computer control unit.

Too much oxygen in the exhaust gas indicates a lean mixture which can cause performance problems, including misfires that lead to engine component damage. Too little oxygen indicates a rich mixture, which wastes fuel and results in excess exhaust emissions and potential damage to the Catalytic Converter.


Due to its location in the exhaust manifold, the sensor is exposed to extremely harsh conditions and carbon, soot, harmful gases, anti-freeze, chemicals and thermal shock all combine to shorten the life of an Oxygen Sensor. An Oxygen Sensor in poor condition results in poor engine performance.

The need for replacement will depend on the type of sensor on the vehicle. Certain sensors have a service life of 50,000kms, whilst others may last up to 100,000kms. Repco Authorised Service mechanics can check the operation of the Oxygen Sensor as part of a routine service.

Repco Authorised Service use and recommend high quality BOSCH Oxygen Sensors.

Check the Auto Facts Videos for more great information here.

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