GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1681413  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector (front wheel drive (FWD) shown, all wheel drive (AWD) similar).
  3. Position the jackstand under the muffler for support.

  4. Object Number: 260064  Size: SH
  5. Remove the exhaust manifold to catalytic converter nuts.

  6. Object Number: 1681430  Size: SH
  7. Remove the catalytic converter to muffler nuts.
  8. Disengage the converter from the hanger.

  9. Object Number: 1681406  Size: SH
  10. Remove the catalytic converter, if equipped with FWD.

  11. Object Number: 1681407  Size: SH
  12. Remove the catalytic converter, if equipped with AWD.

Installation 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: 1681407  Size: SH
  1. Install a NEW gasket onto the muffler studs.
  2. Install a NEW gasket onto the exhaust manifold studs.
  3. Position and install the catalytic converter, if equipped with AWD.

  4. Object Number: 1681406  Size: SH
  5. Position and install the catalytic converter, if equipped with FWD.
  6. Install the converter to the hanger.

  7. Object Number: 1681430  Size: SH
  8. Install the catalytic converter onto the muffler studs.

  9. Object Number: 260064  Size: SH
  10. Gently pull back the catalytic converter and muffler assembly until the converter can be installed onto the exhaust manifold studs.
  11. Install the catalytic converter onto the exhaust manifold studs.
  12. Install the catalytic converter to muffler nuts until snug.
  13. Notice: Refer to Fastener Notice in the Preface section.

  14. Install the catalytic converter to exhaust manifold nuts until snug.
  15. Tighten

        • Tighten the catalytic converter to exhaust manifold nuts to 35 N·m (26 lb ft).
        •  Tighten the catalytic converter to muffler nuts to 34 N·m (25 lb ft).
  16. Remove the jackstand from under the muffler.

  17. Object Number: 1681413  Size: SH
  18. Connect the H02S electrical connector. (FWD shown, AWD similar).
  19. Lower the vehicle.