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Oxygen Sensors

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

Oxygen Sensors

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 it’s location in the exhaust manifold, the sensor is exposed to extremely harsh conditions.

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.

Old Oxygen Sensor (Photo credit: lumachrome)

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.

Our Bosch Auto Service NDM Labrador & Biggera Waters, QLD service mechanics can check the operation of the Oxygen Sensor as part of a routine service.

We use and recommend high quality BOSCH Oxygen Sensors.

You can refer to your vehicle owner’s manual for recommended intervals or your Bosch Auto Service NDM Labrador & Biggera Waters, QLD auto repair mechanic will be happy to advise you.

REMEMBER: Money spent on maintenance can save costly repairs and reduce running costs.

We are happy to answer any more questions you may have regarding Oxygen Sensors.

Bosch Auto Service
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