GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement - Right Side V8

Removal Procedure

    Warning: Refer to Exhaust Service Warning in the Preface section.

    Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

  1. Ignition OFF.
  2. Warning: Refer to Battery Disconnect Warning in the Preface section.

  3. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.

  4. Object Number: 1949711  Size: SH

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

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

  7. Disconnect the right catalytic converter (2) from the exhaust manifold (1).
  8. Danger: 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.

  9. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  10. Caution: Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution in the Preface section.


    Object Number: 1950736  Size: SH
  11. Disconnect the right pre-catalytic converter heated oxygen sensor (HO2S) electrical connector (1).

  12. Object Number: 1947044  Size: SH

    Note: The exhaust crossover pipe assembly to right catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.

  13. Remove the exhaust crossover pipe assembly to right catalytic converter retaining nuts (3).
  14. Discard the nuts.

  15. Disconnect the exhaust crossover pipe assembly (2) from the right catalytic converter (1).

  16. Object Number: 1949681  Size: SH
  17. Remove the right catalytic converter (1) from the vehicle.
  18. Remove the right pre-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.

Installation Procedure

  1. Install the right pre-catalytic converter heated oxygen sensor (HO2S) to the right catalytic converter. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.

  2. Object Number: 1949681  Size: SH

    Note: Make sure that a NEW sealing ring is fitted prior to installation. Failure to comply may cause the exhaust system to perform poorly.

  3. Install the right catalytic converter (1) to the vehicle.

  4. Object Number: 1947044  Size: SH
  5. Align the exhaust crossover pipe assembly (2) to the right catalytic converter (1).
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install the exhaust crossover pipe assembly to right catalytic converter retaining nuts (3) and tighten to 40 N·m (30 lb ft).

  8. Object Number: 1950736  Size: SH
  9. Connect the right pre-catalytic converter HO2S electrical connector (1).

  10. Object Number: 1949711  Size: SH

    Note: Push up and forward on the right catalytic converter (2) to connect to the exhaust manifold (3).

  11. Connect the right catalytic converter (2) to the exhaust manifold (1).
  12. Note: Do not fully tighten the right catalytic converter to exhaust manifold retaining nuts (3) at this stage.

  13. Install the right catalytic converter to exhaust manifold retaining nuts (3).
  14. Do not fully tighten at this stage.

  15. Lower the vehicle.
  16. Tighten the right catalytic converter to exhaust manifold retaining nuts (1) to 45 N·m (33 lb ft).
  17. Make sure the exhaust system is clear of all other components and chassis. If the exhaust system is not clear of all the other components loosen all retaining nuts and re-align. Refer to Exhaust System Alignment.
  18. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.

Catalytic Converter Replacement - Right Side V6

Removal Procedure

    Warning: Refer to Exhaust Service Warning in the Preface section.

    Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

  1. Ignition OFF.
  2. Warning: Refer to Battery Disconnect Warning in the Preface section.

  3. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.
  4. Remove the engine cover. Refer to Engine Cover Replacement.
  5. Remove the right pre-catalytic convertor heated oxygen sensor (HO2S) sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.
  6. Remove the right exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side .

  7. Object Number: 2041477  Size: SH

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

  8. Remove the right catalytic converter to exhaust manifold retaining nuts (3).
  9. Discard the nuts.

    Danger: 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.

  10. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

  11. Object Number: 2053082  Size: SH

    Note: The exhaust crossover pipe assembly to right catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.

  12. Remove the exhaust crossover pipe assembly to right catalytic converter retaining nuts (3).
  13. Discard the nuts.

  14. Pull down and back on the right catalytic converter (1) to disconnect from the exhaust manifold.
  15. Disconnect the exhaust crossover pipe assembly (2) from the right catalytic converter (1).

  16. Object Number: 2053083  Size: SH
  17. Remove the right catalytic converter (1) from the vehicle.

Installation Procedure


    Object Number: 2053083  Size: SH

    Danger: 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.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Note: Make sure that a NEW sealing ring is fitted prior to installation. Failure to comply may cause the exhaust system to perform poorly.

  3. Install the right catalytic converter (1) to the vehicle.

  4. Object Number: 2053082  Size: SH
  5. Align the exhaust crossover pipe assembly (2) to the right catalytic converter (1).
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install NEW exhaust crossover pipe assembly to right catalytic converter retaining nuts (3) and tighten to 40 N·m (30 lb ft).
  8. Lower the vehicle.

  9. Object Number: 2041477  Size: SH
  10. Install NEW right catalytic converter to exhaust manifold retaining nuts (1) and tighten to 45 N·m (33 lb ft).
  11. Make sure that the exhaust system is clear of all other components and chassis. If the exhaust system is not clear of all the other components loosen all retaining nuts and re-align. Refer to Exhaust System Alignment.
  12. Install the right exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side .
  13. Install the right pre-catalytic convertor HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.
  14. Install the engine cover. Refer to Engine Cover Replacement.
  15. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .