Oxygen Sensor: Description and Operation

Function And Operation Principle

Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed on upstream and downstream of the Manifold Catalyst Converter (MCC). After it compares oxygen consistency of the atmosphere with the exhaust gas, it communicates the oxygen consistency of the exhaust gas to the PCM. The temperature of the sensor's tip normally operates above 370°C (698°F). It uses a heater which is controlled by the PCM duty signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.