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Removal Procedure

    WARNING:

    Refer to Exhaust Service Warning .

    WARNING:

    Refer to Protective Goggles and Glove Warning .

  1. Ignition OFF.
    2. WARNING:

    Refer to Battery Disconnect Warning .

  2. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection (Primary) , Battery Negative Cable Disconnection and Connection (Auxiliary) .
    3. Fig 1: Identifying Left Catalytic Converter To Exhaust Manifold Retaining Nuts
    GM1949706Courtesy of GENERAL MOTORS CORP.
    NOTE:

    The left catalytic converter to exhaust manifold retaining nuts (1) are single use parts. They must be discarded after removal.

  3. Remove the left catalytic converter to exhaust manifold retaining nuts (1).

    Discard the nuts.

  4. Disconnect the left catalytic converter (2) from the exhaust manifold (3).
    5. Fig 2: Identifying Right Catalytic Converter To Exhaust Manifold Retaining Nuts
    GM1949711Courtesy of GENERAL MOTORS CORP.
    NOTE:

    The right catalytic converter to exhaust manifold retaining nuts (3) are single use parts. They must be discarded after removal.

  5. Remove the right catalytic converter to exhaust manifold retaining nuts (3).

    Discard the nuts.

  6. Disconnect the right catalytic converter (2) from the exhaust manifold (1).
    7. WARNING:

    To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

  7. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    8. Fig 3: Identifying Left Pre-Catalytic Converter Heated Oxygen Sensor (HO2S) Electrical Connector
    GM1950735Courtesy of GENERAL MOTORS CORP.
    CAUTION:

    Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution

  8. Disconnect the left pre-catalytic converter HO2S electrical connector (1).
    9. Fig 4: Identifying Right Pre-Catalytic Converter Heated Oxygen Sensor (HO2S) Electrical Connector
    GM1950736Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the right pre-catalytic converter HO2S electrical connector (1).
    10. Fig 5: Identifying HO2S Electrical Connector
    GM1949882Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the left post-catalytic converter HO2S electrical connector (1).
    11. Fig 6: Identifying Oxygen Sensor & Wiring Harness Connector
    GM1949877Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the right post-catalytic converter HO2S electrical connector (1).
    12. Fig 7: Exhaust System And Insulator Hangers
    GM2543500Courtesy of GENERAL MOTORS CORP.
  12. Detach the exhaust system (2) by removing the front insulator hangers (1).
  13. Support the exhaust system with a suitable jack.
    14. Fig 8: Transmission Tunnel Cross-Brace To Body Retaining Bolts
    GM1949712Courtesy of GENERAL MOTORS CORP.
  14. Remove the transmission tunnel cross-brace to body retaining bolts (2).
  15. Remove the transmission tunnel cross-brace (1).
    16. Fig 9: Left Rear Insulator Hanger And Body Retaining Bolts
    GM2543504Courtesy of GENERAL MOTORS CORP.
  16. Remove the left rear insulator hanger to body retaining bolts (1).
    17. Fig 10: Right Rear Insulator Hanger And Body Retaining Bolts
    GM2543503Courtesy of GENERAL MOTORS CORP.
  17. Remove the right rear insulator hanger to body retaining bolts (1).
    18. Fig 11: Identifying Center Insulator Hanger Bracket To Differential Retaining Bolts
    GM1947047Courtesy of GENERAL MOTORS CORP.
  18. Remove the center insulator hanger bracket to differential retaining nut (1).
  19. Detach the exhaust system assembly from the center insulator hanger bracket to differential retaining stud (1).
  20. With the aid of an assistant or using a suitable jack; carefully lower the exhaust system from the vehicle.
  21. Remove the left pre-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 .
  22. Remove the left post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
  23. Remove the right pre-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
  24. Remove the right post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 .
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