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How to Test an Oxygen Sensor?

1 Answers

VanEvangeline

07/29/25 11:29pm

Methods for testing an oxygen sensor: 1. Use a decoder to test: If the oxygen sensor malfunctions, a fault code will be stored in the vehicle's ECU; 2. Check the resistance of the oxygen sensor's heating element: Under normal conditions, the resistance of the oxygen sensor's heating element is between 1 and 5 ohms. A multimeter can be used to measure the resistance between the two ends of the oxygen sensor's wiring harness connector to determine if it is faulty; 3. Test the power supply of the oxygen sensor's heating element: When using a multimeter to test the oxygen sensor's heating element, start the engine and measure the voltage at both ends of the oxygen sensor's wiring harness connector. The normal voltage should be above 11V; 4. Check the signal voltage of the oxygen sensor: Use a multimeter to measure the voltage of the oxygen sensor. When the mixture is rich, the voltage should be between 0.7 and 1.0V, and when the mixture is lean, the voltage should be between 0.1 and 0.3V.

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