Oxygen Sensor: Service and Repair

Oxygen Sensor Location:

Oxygen Sensor Socket:

Warning: Exhaust manifold becomes very hot during engine operation.
Caution: The oxygen sensor has a permanently attached wire and connector. This should not be removed or pulled on, as any change in circuit resistance will affect engine performance and emissions.
Caution: Excessive force may damage threads in exhaust manifold or pipe.

1. Disconnect oxygen sensor electrical connector.
2. Using a suitable tool (tool # C-4907 or equivalent), carefully remove the sensor from exhaust manifold or pipe. The oxygen sensor may be easier to remove when engine temperature is above 120°F.
3. Clean threads in exhaust manifold with an 18 mm X 1.5 + 6E tap.
4. If a new sensor is being used, verify that the threads are coated with anti-seize compound, before installing in manifold or pipe.
4. If a used sensor is being installed, coat sensor threads with a nickel based anti-seize compound (Loctite 771-64 or equivalent), then install sensor in manifold or pipe. Do not use graphite or other anti-seize compounds.
5. Torque the oxygen sensor to 20 ft-lbs (27 Nm), connect wiring.