GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Use a utility stand to support the catalytic converter.
  3. Disconnect the oxygen sensor electrical connector.

  4. Object Number: 372621  Size: SH

    Notice: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.

  5. Remove the catalytic converter nuts from the exhaust manifold.
  6. Disconnect the catalytic converter from the catalytic converter hangers.
  7. Reposition the exhaust system in order to access the exhaust seal.

  8. Object Number: 107855  Size: SH
  9. Remove the catalytic converter seal.

Installation Procedure


    Object Number: 107855  Size: SH
  1. Install the catalytic converter seal.

  2. Object Number: 372621  Size: SH
  3. Install the catalytic converter to the exhaust manifold.
  4. Connect the catalytic converter to the catalytic converter hangers.
  5. Remove the utility stand.
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the catalytic converter nuts.
  8. Tighten
    Tighten the catalytic converter nuts to 34 N·m (25 lb ft).

  9. Install the oxygen sensor electrical connector.
  10. Lower the vehicle.