Heated Oxygen Sensor 2 (HO2S-2)

REMOVAL

CAUTION: Make sure the vehicle is centered and properly positioned prior to lifting.




1. Raise vehicle.

NOTE: Do not apply grease or silicon products to the HO2S-2. Do not alter the wiring in anyway. The wires carry reference air to the sensor.

2. Remove HO2S-2 wiring harness from cradle by pushing up on retaining clip tab.




3. Remove Connector Position Assurance (CPA) device and disconnect HO2S-2 harness connector.




4. Remove HO2S-2 wiring harness from trough in converter heat shield by gently pulling wiring harness from its retaining clips.
5. Remove HO2S-2 using Saturn tool SA9603E. If necessary, use a liquid penetrate before removing sensor.

IMPORTANT: The HO2S-2 uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

INSTALLATION

NOTE: When reinstalling an existing sensor, always use an anti-seize compound (Saturn P/N 21485279 or equivalent) on the threads of the oxygen sensor. Never use silicone products; silicone products will contaminate the sensor. A new Saturn service replacement sensor already has a sufficient amount of anti-seize compound and does not require any additional compound to be added.

Rear Oxygen Sensor:

1. Install HO2S-2 using Saturn tool SA9603E.

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

NOTE: Make sure the marker tape is centered with the edge of the trough to ensure enough slack in the harness.




2. Install HO2S-2 harness into the retaining clips in the trough in the converter heat shield.




3. Connect HO2S-2 harness connector.
4. Install Connector Position Assurance (CPA) device in harness connector.




5. Install HO2S-2 wiring harness retaining clip into cradle.
6. Lower vehicle to start engine.
7. Check for leaks.