Possible causes – Downstream O2 sensor harness is open or shorted– Downstream O2 sensor circuit poor electrical connection– Exhaust leak near O2 sensor– Faulty O2 sensor– Fuel contamination When is the code detected? The Engine Control Module (ECM) has detected
Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector
Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector
Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector
Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector
Possible causes – Large vacuum leak– Fuel system malfunction– Faulty Mass Air Flow (MAF) sensor– Ignition system malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Pre cat or downstream post cat o2 sensor harness is open or shorted– Pre cat or downstream post cat o2 sensor circuit poor electrical connection– Exhaust system leak– Faulty pre cat or downstream post cat o2 sensor