For 1990-2009 cars

#### Tools Required

J 39194-C Oxygen Sensor Wrench

### Removal Procedure

Notice: The oxygen sensor uses a permanently attached pigtail and connector. Do not remove the pigtail from the oxygen sensor. Damage to or removal of the pigtail connector could affect proper operation of the oxygen sensor.

Notice: The use of excessive force may damage the threads in the exhaust manifold/pipe.

Important: The in-line connector and louvered end must be kept clear of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the oxygen sensor.

Important: The oxygen sensor may be difficult to remove when the engine temperature is less than 48°C (120°F).

1. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Replacement .
2. Disconnect the oxygen sensor harness connector.
3. Remove the oxygen sensor using J 39194-C .

### Installation Procedure

Important: A special anti-seize compound is used on the oxygen sensor threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied before installation.

1. Coat the threads of the oxygen sensor with anti-seize compound GM P/N 12377953 or Saturn P/N 21485279, if necessary.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the oxygen sensor.

Tighten
Tighten the oxygen sensor to 30 N·m (22 lb ft).

3. Connect the oxygen sensor harness connector.
4. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Replacement .