Symptoms of Oxygen Sensor Failure?

[DeEllie]

Once the oxygen sensor fails, the computer of the electronic fuel injection system will not be able to obtain information about the oxygen concentration in the exhaust pipe, thus failing to perform feedback control on the air-fuel ratio. This will lead to increased engine fuel consumption and exhaust pollution, as well as engine issues such as unstable idling, misfiring, and surging. Typically, there are two oxygen sensors, described as follows: 1. Front Oxygen Sensor: The front oxygen sensor is used to adjust the mixture concentration, while the rear oxygen sensor monitors the working condition of the three-way catalytic converter. Failure of the front oxygen sensor will result in the inability to correct the mixture, leading to increased vehicle fuel consumption and reduced power. 2. Rear Oxygen Sensor: Failure of the rear oxygen sensor means the working condition of the three-way catalytic converter cannot be determined. If the three-way catalytic converter fails, timely maintenance will not be possible, ultimately affecting the engine's operating condition.