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What are the methods for testing automotive oxygen sensors?

1 Answers

MacRiver

07/29/25 9:14am

Automotive oxygen sensor testing methods are as follows: 1. Consult the vehicle circuit diagram: Based on the circuit diagram, identify the wire colors corresponding to the oxygen sensor for the specific vehicle model to facilitate on-vehicle measurements, using a four-wire oxygen sensor as an example here. 2. Measure the oxygen sensor heating power supply wire: The heating power supply wire provides 12V. Unplug the sensor connector on the vehicle and measure whether there is a 12V power supply in the wiring harness. If present, it indicates the wiring harness is normal. 3. Measure the oxygen sensor heating control wire: The heating control wire is controlled by the vehicle's computer module, and the actual measured voltage is approximately 5V.

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