Oxygen Sensor: Service and Repair

Left Catalytic Converter And Oxygen Sensor Location:

Right Catalytic Converter And Oxygen Sensor Location:

The oxygen sensor has a permanently attached pig-tail and connector. This pig-tail should not be removed, since removal will affect proper operation of the oxygen sensor.

1. Disconnect electrical connector from oxygen sensor.
2. Using a suitable wrench, carefully remove sensor. The oxygen sensor may be difficult to remove when the engine temperature is below 120°F. Use caution, since excessive force may damage threads in exhaust manifold.
3. If a new sensor is being used, install the sensor into the manifold or pipe. New sensor threads will be pre-lubricated with anti-seize compound.
4. If the old sensor is being reused, coat the threads with anti-seize compound GM part #5613695 or equivalent, then install it into the manifold or pipe. Coat the threads only, avoid getting any compound on the sensor tip.
5. Torque oxygen sensor to 42 Nm (31 ft.lbs), then reconnect electrical connector.