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HEATED OXYGEN SENSOR CHECK
1. Disconnect the heated oxygen sensor connector.
2. Check that there is continuity between terminal 1 and terminal 3 on the heated oxygen sensor connector.
3. If there is no continuity, replace the heated oxygen sensor.
4. Warm up the engine until engine coolant is 80°C (176°F) or higher.
5. Use the jumper wires to connect terminal 3 of the heated oxygen sensor connector to the battery (+) terminal and terminal 1 to the battery (-) terminal.

CAUTION: Be very careful when connecting the jumper wires, or the heated oxygen sensor can be damaged.

6. Connect a digital voltmeter between terminal 2 and terminal 4.
7. While repeatedly racing the engine, measure the heated oxygen sensor output voltage.




Standard value

8. If the sensor is defective, replace the heated oxygen sensor