GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section.


    Object Number: 1960377  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the connector position assurance (CPA) retainer (3).
  3. Disconnect the engine wiring harness electrical connector (2) from the HO2S electrical connector (1).
  4. Remove the HO2S clip from the engine wiring harness clip (4).
  5. Notice: Refer to Excessive Force and Oxygen Sensor Notice in the Preface section.


    Object Number: 1960379  Size: SH
  6. Remove the HO2S (2).

Installation Procedure

Important: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.


    Object Number: 1960379  Size: SH
  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Notice: Refer to Component Fastener Tightening Notice in the Preface section.

  3. Install the HO2S (2).
  4. Tighten
    Tighten the sensor to 42 N·m (31 lb ft).


    Object Number: 1960377  Size: SH
  5. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (1).
  6. Install the CPA retainer (3).
  7. Install the HO2S clip to the engine wiring harness clip (4).
  8. Lower the vehicle.