How to Determine if the Engine Oxygen Sensor is Faulty?

1 Answers
GiaFitz
07/23/25 8:42pm
Methods to determine if the engine oxygen sensor is faulty: 1. Ceramic breakage: The ceramic in the oxygen sensor is hard and brittle. Striking it with a hard object or washing it with strong airflow may cause it to break, preventing the oxygen sensor from maintaining normal working conditions; 2. Heater wire burnout: For heated oxygen sensors, if the heater wire is burned out, it becomes difficult for the sensor to reach normal operating temperature and thus loses functionality; 3. Internal wire disconnection: If the internal wires of the oxygen sensor become disconnected. Once the oxygen sensor fails, the electronic fuel injection system's computer cannot obtain accurate information about the oxygen concentration in the exhaust pipe, thus failing to provide feedback control for the air-fuel ratio.
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