GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2009 🢒 Astra 🢒 Engine 🢒 Engine Exhaust 🢒 Auxiliary Catalytic Converter Replacement

Removal Procedure
  1. Open the hood.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.

    3. Object Number: 1998455 Size: LH
  3. Disconnect the wiring harness for the oxygen sensor  (2).

    4. Disconnect the wiring harness plug (1).

  4. See the assembly instruction on the shipping or moving fastening. Refer to Exhaust System Flex Pipe Shipping Protector Removal and Installation.

    5. Object Number: 1937693 Size: SH
  5. Remove the front exhaust pipe/auxiliary catalytic converter from the catalytic converter.

    6. Remove the 3 nuts (1).


    Object Number: 1998459 Size: SH
  6. Remove the front exhaust pipe/auxiliary catalytic converter (1).
    7. • Support the center muffler to the underbody with wire.
    • Release the clamp fitting (2) and remove the wiring plug connection.

    Object Number: 1936899 Size: SH
  7. Remove the oxygen sensor (1).

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.

  1. Install the oxygen sensor.

    2. Coat the threads of the oxygen sensor with anti-sieze mounting paste.

    Tighten
    Tighten the oxygen sensor to 30 N·m (22 lb ft).

  2. Install the front exhaust pipe/auxiliary catalytic converter.
    3. • Install the front exhaust pipe/auxiliary catalytic converter to the catalytic converter with the new gasket.

    Tighten
    Tighten the 3 new nuts to 20 N·m (15 lb ft).

    • Install the front exhaust pipe/auxiliary catalytic converter to the center muffler.

    Tighten
    Tighten the clamp fitting to 50 N·m (37 lb ft).

  3. Connect the wiring harness for the oxygen sensor.

    4. Connect the wiring harness plug.

  4. Lower the vehicle.
  5. Close the hood.