Tools Required

J 29533-A Oxygen Sensor Wrench

Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

When the engine temperature is below 48°C (120°F), the Oxygen Sensor (HO2S) may be difficult to remove. Excessive force may damage the threads in the exhaust manifold or the exhaust pipe.

1. Turn OFF the ignition.



2. Remove the electrical connector.



3. Carefully back out the oxygen sensor and seal using the J 29533-A oxygen sensor wrench.

Important: A special anti-seize compound is used on the Oxygen Sensor (O2S) threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an engine and if for any reason it is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. Coat the threads of the oxygen sensor with the anti-seize compound GM P/N 5613695 or the equivalent if necessary.
2. Install the sensor and seal.

Tighten
Tighten the sensor to 41 N·m (30 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.




3. Install the electrical connector.