The Functions of the Front and Rear Oxygen Sensors

1 Answers
JanelleMarie
07/30/25 4:29am
The functions of the front and rear oxygen sensors: 1. The front oxygen sensor detects the oxygen concentration in the engine exhaust and provides this information to the ECU in the form of an electrical signal. The ECU then uses the oxygen concentration data to perform closed-loop control of the fuel injection amount. 2. The rear oxygen sensor detects the oxygen concentration in the exhaust after it has been treated by the three-way catalytic converter. If the data detected by the front and rear oxygen sensors are the same, it indicates that the three-way catalytic converter has failed. In engines equipped with a three-way catalytic converter to reduce exhaust pollution, the oxygen sensor is an essential component. Oxygen sensor models include the AutoO2 series, CiTicel series, 4 series, 7 series, and MICROcel series.
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