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The Functions of the Front Oxygen Sensor and Rear Oxygen Sensor

1 Answers

DeMaverick

07/29/25 8:23pm

The functions of the front oxygen sensor and rear oxygen sensor are as follows: 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 volume. If the detected oxygen concentration in the exhaust is too high, it indicates that the engine's air-fuel mixture is too lean; conversely, if the oxygen concentration is low, it means the mixture is too rich. The ECU adjusts the fuel injection accordingly to achieve the optimal air-fuel ratio. 2. The rear oxygen sensor primarily measures 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 identical, it indicates that the three-way catalytic converter has failed.

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