Oxygen Sensor (O2)
WARNING: This page is about a different car, the 1989 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
- 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. Replace O2 sensor, if voltage is not .5-1.0 volt while accelerating and 0-.4 volt while decelerating. Ensure new oxygen sensor has anti-seize compound applied to threads. Tighten sensor to 22-36 ft. lbs. (29-49 N.m).