Installation Procedure

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

Apply a small amount of anti-seize compound Saturn P/N 21485279, or equivalent, to the threads of the HO2S-2.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Fig 1: Removing & Installing Heated Oxygen Sensor-2

Courtesy of GENERAL MOTORS CORP.

Install the HO2S-2 using the J 39194-C , or equivalent. See Special Tools .
Tighten: Tighten the HO2S-2 sensor-to-exhaust pipe to 45 N.m (33 lb. ft.).

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.

Install the HO2S-2 harness clip to the heat shield attachment bolt.
Tighten: Tighten the bolt to 4 N.m (35 lb. in.).
Connect the HO2S-2 harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
Ensure the HO2S-2 harness pigtail connector is secure to the chassis.