Rear Oxygen Sensor

REMOVAL

IMPORTANT: The rear heated oxygen sensor uses a permanently attached pigtail and connector. This pigtail should not be removed from the oxygen sensor. Damage or removal of pigtail or connector will affect proper operation of sensor.

CAUTION: Make sure the vehicle is properly supported and squarely positioned prior to lifting. To help avoid personal injury when a vehicle is on a hoist provide additional support for the vehicle on the opposite end from which components are removed. Make sure hoist does not contact fuel or brake lines.

1. Raise vehicle on hoist.
2. Remove oxygen sensor harness from heat shield attachment.
3. Disconnect oxygen sensor electrical connector.
4. Remove oxygen sensor from exhaust manifold pipe.

INSTALLATION

NOTE: Always use a nickel-based anti-seized compound (Saturn PIN 21485279 or equivalent) on the threads of the oxygen sensor. If the oxygen sensor is replaced, do not apply anti-seize to the new sensor. New sensors have anti-seized pre-applied. Never use silicon products; silicon products will cause damage to oxygen sensors.

1. Install oxygen sensor to exhaust manifold pipe.

Torque: 45 N.m (33 ft-lbs)

2. Connect oxygen sensor electrical connector.
3. Attach oxygen sensor harness to heat shield.

Torque: 2 N.m (18 in-lbs)

4. Lower vehicle from hoist.