What is the fault diagnosis method for oxygen sensors?
2 Answers
The fault diagnosis method for oxygen sensors is: 1. Warm up the engine to normal operating temperature; 2. Connect the negative probe of the multimeter's voltage range to the E1 terminal in the fault detection socket or the negative terminal of the battery, and connect the positive probe to the OX1 or OX2 terminal in the fault detection socket or the output wire on the oxygen sensor harness connector; 3. Maintain the engine speed at 2500 rpm and check whether the voltmeter needle swings between 0 and 1V, recording the number of swings within 10 seconds; 4. Check if the oxygen sensor is damaged; 5. Inspect the appearance and color of the oxygen sensor.
Diagnosing oxygen sensor issues is actually quite interesting. As a car enthusiast who enjoys tinkering with vehicles, I often encounter this problem. The first step is to observe symptoms, such as whether the check engine light is on. If it's illuminated, there's an 80% chance the sensor is faulty. Next, plug in an OBD scanner to read the trouble codes—common ones like P0131 or P0141 will directly indicate the issue. Then, test the sensor voltage by measuring the connector near the exhaust pipe with a multimeter. Normal readings should fluctuate between 0.1 and 0.9 volts. If the voltage doesn't change or remains fixed, the sensor is likely dead. Finally, check for loose or dirty wiring and use compressed air to blow out carbon buildup. Regular maintenance can reduce failures—I usually replace mine every five years. Remember these tips, and you can handle it like a pro at home, saving money and hassle while avoiding roadside breakdowns.
