Exhaust Gas Oxygen (O2) Sensor
- Warm engine to operating temperature. Run engine at fast idle. Disconnect O2 sensor. Connect a high impedance voltmeter between O2 sensor and ground.
- Observe voltmeter while rapidly accelerating and decelerating engine speed. If voltage is not .5-1.0 volt while accelerating and 0-.4 volt while decelerating, replace O2 sensor. Ensure new O2 sensor has anti-seize compound applied to threads. Tighten sensor to 22-36 ft. lbs. (29-49 N.m).