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: 1960351  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Unbolt the front propeller shaft from the front differential, if equipped with four wheel drive (4WD). Refer to Front Propeller Shaft Replacement .
  3. Remove the connector position assurance (CPA) retainer (4).
  4. Disconnect the engine wiring harness electrical connector (7) from the HO2S.
  5. Remove the HO2S electrical connector clip (6) from the fuel line clip.
  6. Notice: Refer to Excessive Force and Oxygen Sensor Notice in the Preface section.


    Object Number: 1960379  Size: SH
  7. Remove the HO2S (1).

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: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

  3. Install the HO2S (1).
  4. Tighten
    Tighten the sensor to 42 Nยทm (31 lb ft).


    Object Number: 1960351  Size: SH
  5. Connect the engine wiring harness electrical connector (7) to the HO2S.
  6. Install the engine wiring harness electrical connector clip (6) to the fuel line clip.
  7. Install the CPA retainer (4).
  8. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to Front Propeller Shaft Replacement .
  9. Lower the vehicle.