Heated Oxygen Sensor 2 (HO2S-2)

TOOLS REQUIRED
^ J 39194C O2 Sensor Wrench

REMOVAL

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




1. Ignition Off.

CAUTION: MAKE SURE VEHICLE IS PROPERLY SUPPORTED AND SQUARELY POSITIONED ON THE HOIST. 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 BEING REMOVED.

2. Raise vehicle.
3. Disconnect HO2S-2 harness connector.
4. Remove HO2S-2 harness clip from heat shield attachment.
5. Use liquid penetrate before removing sensor.

NOTE: Removal of the sensor is easier if the exhaust system is slightly warmed. Be careful that the exhaust is not too hot to work on safely. Moving the sensor back and forth while applying penetrating oil to the threads will aid in removal and will decrease the chance of exhaust pipe thread damage.

6. Remove HO2S-2 using O2 Sensor Wrench J 39194C (or equivalent).

INSTALLATION

NOTE: Silicone based products will contaminate the HO2S-2. Use only a nickel based anti-seize compound that does not contain silicone.

1. Apply a small amount of anti-seize compound Saturn P/N 21485279 (or equivalent) to the threads of the HO2S-2.
2. Install HO2S-2 using O2 sensor wrench J 39194C (or equivalent).

Torque:
HO2S-2 Sensor-to-Exhaust Pipe: 45 N.m (33 ft-lbs)

NOTE: DO NOT apply any material in the HO2S-2 harness connector such as grease or dielectric compound. The wires carry air reference to the sensor in order for the sensor to operate properly.

3. Install HO2S-2 harness clip to heat shield attachment bolt.

Torque:
HO2S-2 Harness Clip-to-Heat Shield Bolt: 4 N.m (35 in-lbs)

4. Connect HO2S-2 harness connector. Push in connector until a click is heard, then pull back to confirm a positive engagement.
5. Make sure HO2S-2 harness pigtail connector is secured to the chassis.