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What are the symptoms of a faulty rear oxygen sensor?

1 Answers

DiGianna

07/29/25 2:40pm

Symptoms of a faulty rear oxygen sensor: 1. Increased engine fuel consumption and exhaust pollution; 2. The engine may experience unstable idling, misfiring, or surging. Solutions: 1. Correctly select and install rubber gaskets, and avoid applying solvents or anti-adhesive agents not specified by the manufacturer on the sensor; 2. Replace the oxygen sensor. The oxygen sensor is an essential component in engines using a three-way catalytic converter to reduce exhaust pollution. For example, the ECU determines whether the air-fuel ratio is low or high based on the electromotive force difference from the oxygen sensor and controls the fuel injection duration accordingly. If the oxygen sensor malfunctions and outputs abnormal electromotive force, the computer cannot accurately control the air-fuel ratio.

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