GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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.


    Object Number: 260064  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. If the vehicle is equipped with All-Wheel-Drive (AWD), remove the propeller shaft. Refer to Propeller Shaft Replacement .
  3. Remove the catalytic converter to exhaust manifold nuts.
  4. Remove the connector position assurance (CPA) retainer.
  5. Disconnect the heated oxygen sensor (HO2S) electrical connector.

  6. Object Number: 1645182  Size: SH
  7. Remove the catalytic converter to muffler bolts.
  8. Remove and discard the catalytic converter to muffler gasket.

  9. Object Number: 1645185  Size: SH
  10. If equipped with regular production option (RPO) LX9 and front wheel drive (FWD), remove the catalytic converter (1).
  11. If equipped with RPO LX9 and AWD, remove the catalytic converter (2).

  12. Object Number: 1645186  Size: SH
  13. If equipped with RPO LY7 and FWD, remove the catalytic converter (1).
  14. If equipped with RPO LY7 and AWD, remove the catalytic converter (2).
  15. Remove the HO2S . Refer to Heated Oxygen Sensor 2 Replacement for the 3.5L engine or Heated Oxygen Sensor 2 Replacement for the 3.6L engine.

Installation Procedure


    Object Number: 1645186  Size: SH
  1. Install the HO2S . Refer to Heated Oxygen Sensor 2 Replacement for the 3.5L engine or Heated Oxygen Sensor 2 Replacement for the 3.6L engine.
  2. If equipped with RPO LY7 and FWD, install the catalytic converter (1).
  3. If equipped with RPO LY7 and AWD, install the catalytic converter (2).

  4. Object Number: 1645185  Size: SH
  5. If equipped with RPO LX9 and FWD, install the catalytic converter (1).
  6. If equipped with RPO LX9 and AWD, install the catalytic converter (2).

  7. Object Number: 1645182  Size: SH
  8. Install a NEW catalytic converter to muffler gasket.
  9. Notice: Refer to Fastener Notice in the Preface section.

  10. Install the catalytic converter to muffler bolts.
  11. Tighten
    Tighten the bolts to 45 N·m (33 lb ft).


    Object Number: 260064  Size: SH
  12. Install the catalytic converter to exhaust manifold nuts.
  13. Tighten
    Tighten the nut to 34 N·m (25 lb ft).

  14. Connect the HO2S electrical connector.
  15. Install the CPA retainer.
  16. If the vehicle is equipped with AWD, install the propeller shaft. Refer to Propeller Shaft Replacement .
  17. Lower the vehicle.