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Installation Procedure

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  1. If the catalytic converter was replaced, perform the following:
    1. Apply anti-seize compound

      1.1. GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.

    2. 1.2. Install the oxygen sensors.
      NOTE: 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.

      Tighten 

      Tighten the oxygen sensors to 42 N.m (31 lb ft).

      3. Fig 1: Installing Catalytic Converter Oxygen Sensors
      G02119438Courtesy of GENERAL MOTORS CORP.
  2. Install the catalytic convertor.
  3. Install NEW exhaust manifold pipe seals to the exhaust manifolds.
  4. Install the right exhaust manifold pipe nuts until sung.
    5. Fig 2: Installing Right Exhaust Manifold Pipe Nuts
    G02119439Courtesy of GENERAL MOTORS CORP.
  5. Install the left exhaust manifold pipe nuts until snug.
    6. Fig 3: Installing Left Exhaust Manifold Pipe Nuts
    G02119440Courtesy of GENERAL MOTORS CORP.
  6. Tighten the right and left exhaust manifold pipe nuts.

    Tighten 

    Tighten the nuts to 50 N.m (39 lb ft).

  7. Install the exhaust muffler nuts.

    Tighten 

    Tighten the nuts to 40 N.m (30 lb ft).

    8. Fig 4: Installing Exhaust Muffler Nuts
    G02119441Courtesy of GENERAL MOTORS CORP.
  8. Connect the oxygen sensor electrical connectors (1, 2).
    9. Fig 5: Installing Oxygen Sensor Electrical Connectors
    G02119442Courtesy of GENERAL MOTORS CORP.
  9. Connect the CPA retainers.
  10. Clip the oxygen sensors electrical connectors to the following:
    • Hose clip
    • Transmission crossmember
  11. Connect the oxygen sensor electrical connectors.
  12. Connect the CPA retainers.
  13. Install the clip around the engine harness and the oxygen sensor pigtail.
    14. Fig 6: Installing Clip Around Engine Harness And Oxygen Sensor Pigtail
    G02119443Courtesy of GENERAL MOTORS CORP.
  14. Install the transmission support crossmember.
    15. Fig 7: Installing Transmission Support Crossmember
    G02119444Courtesy of GENERAL MOTORS CORP.
  15. Install the transmission support crossmember bolts and nuts.

    Tighten 

    Tighten the bolts to 95 N.m (70 lb ft).

  16. lower the transmission onto the transmission support.
  17. Install the transmission mount to transmission support nuts.

    Tighten 

    Tighten the nuts to 40 N.m (30 lb ft).

    18. Fig 8: Installing Transmission Mount To Transmission Support Nuts
    G02119445Courtesy of GENERAL MOTORS CORP.
  18. Remove the transmission jack.
  19. Lower the vehicle.
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