GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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


    Object Number: 1839013  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Remove the connector position assurance (CPA) retainer (4) from the HO2S electrical connection.
  3. Disconnect the heated oxygen sensor (HO2S) electrical connector (3) from the engine wiring harness electrical connector (2).

  4. Object Number: 1839022  Size: SH
  5. Remove the bank 2 sensor 2 HO2S (1) from the catalytic converter.

Installation Procedure

Note: A special anti-seize compound is used in 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 reinstalled, the threads must have anti-seize compound applied before the reinstallation.


    Object Number: 1839022  Size: SH
  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the bank 2 sensor 2 HO2S (1) to the catalytic converter and tighten the sensor to 42 N·m (31 lb ft).

  4. Object Number: 1839013  Size: SH
  5. Connect the HO2S electrical connector (3) to the engine wiring harness electrical connector (2).
  6. Install the CPA retainer (4) to the HO2S electrical connection.
  7. Lower the vehicle.