GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 Preface 🢒 Cautions and Notices 🢒 Heated Oxygen Sensor Replacement - Bank 1 Sensor 1

Removal Procedure

    Caution: Refer to Exhaust Service Caution in the Preface section.

    Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

  1. Ignition OFF.

    2. Caution: Refer to Battery Disconnect Caution in the Preface section.

  2. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Remove the engine cover. Refer to Engine Cover Replacement.

    4. Object Number: 2173129 Size: SH
  4. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).

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

  5. Remove the HO2S (2) from the exhaust manifold.

Installation Procedure

    Notice: Refer to Component Fastener Tightening Notice in the Preface section.


    Object Number: 2173129 Size: SH

    Important: New oxygen sensors should have a special anti-seize compound already applied to the sensor threads. If you are installing the original sensor, apply an approved anti-seize compound to the sensor threads.

  1. Install the HO2S (2) into the exhaust manifold.

    2. Tighten
    Tighten the HO2S to 42 N·m (31 lb ft).

  2. Connect the HO2S electrical connector (1).
  3. Install the engine cover. Refer to Engine Cover Replacement.
  4. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .