GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39194-C Oxygen Sensor Wrench

Removal Procedure


    Object Number: 1228627  Size: SH

    Important: Bank 1 are cylinders 1, 3, and 5 which are closest to the front of the dash.

  1. Turn the ignition OFF.
  2. Disconnect the bank 1 heated oxygen sensor 1 harness connector (1).

  3. Object Number: 1226398  Size: SH

    Caution: Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.

  4. Remove the oxygen sensor using the J 39194-C .

Installation Procedure


    Object Number: 1226398  Size: SH
  1. Apply a small amount of the anti-seize compound SA P/N 21485279, or equivalent, to the threads of the heated oxygen sensor 1.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the heated oxygen sensor 1 using the J 39194-C .
  4. Tighten
    Tighten the oxygen sensor to 44 N·m (33 lb ft).


    Object Number: 1228627  Size: SH
  5. Connect the bank 1 heated oxygen sensor 1 harness connector (1). Make sure the locking tab is in the full closed position.
  6. Start the engine and make sure no exhaust leaks exist.