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: 1554557  Size: SH
  1. Remove the intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
  2. Remove the connector position assurance (CPA) retainer (1).
  3. Disconnect the bank 1 sensor 1 electrical connector (2).

  4. Object Number: 1554545  Size: SH
  5. Remove the bank 1 sensor 1 from the exhaust manifold.

Installation Procedure

Note: 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 reinstallation.


    Object Number: 1554545  Size: SH
  1. If re-installing the old sensor, coat the threads with anti-seize compound P/N 12377953, or equivalent.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the bank 1 sensor 1 to the exhaust manifold.
  4. Tighten
    Tighten the sensor to 42 N·m (31 lb ft).


    Object Number: 1554557  Size: SH
  5. Connect the bank 1 sensor 1 electrical connector (2).
  6. Install the CPA retainer (1).
  7. Install the intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.