GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement 2.4L

Removal Procedure


    Object Number: 1774817  Size: SH
  1. Remove the nuts and gasket from the exhaust front pipe-to-underbody catalytic converter (UCC).

  2. Object Number: 1774819  Size: SH
  3. Remove the nuts and gasket from the UCC-to-front muffler pipe.
  4. Remove the UCC assembly.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1774819  Size: SH
  1. Install the nuts and gasket to the UCC-to-front muffler pipe.
  2. Tighten
    Tighten the underbody catalytic converter-to-front muffler nuts to 30 N·m (22 lb ft).


    Object Number: 1774817  Size: SH
  3. Install the nuts and gasket to the exhaust front pipe-to-UCC.
  4. Tighten
    Tighten the exhaust front pipe-to-underbody catalytic converter nuts to 30 N·m (22 lb ft).

Catalytic Converter Replacement 2.0L Diesel

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1820482  Size: SH

    Caution: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

    Notice: When inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to prevent overheating of the floor pan and possible damage to the passenger compartment insulation and trim materials.

  1. Disconnect the negative battery cable.
  2. Remove the exhaust manifold heat shield.

  3. Object Number: 1820483  Size: SH
  4. Remove the exhaust front pipe. Refer to Front Pipe Replacement .
  5. Remove the pre-catalyst clamp.
  6. Remove the pre-catalyst bracket bolt from the engine block.
  7. Remove the pre-catalyst with the seal ring.

Installation Procedure


    Object Number: 1820483  Size: SH
  1. Install the pre-catalyst with the seal ring. If damaged, replace the new seal ring.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the pre-catalyst clamp and the bracket bolt.
  4. Tighten
    Tighten the pre-catalyst bracket bolt to 40 N·m (29.5 lb ft).


    Object Number: 1820482  Size: SH
  5. Install the exhaust manifold heat shield.
  6. Tighten
    Tighten the exhaust manifold heat shield bolt and nut to 20 N·m (14.8 lb ft).

Catalytic Converter Replacement 3.2L

Removal Procedure


    Object Number: 1860114  Size: SH
  1. Remove the 3 nuts and gasket from the exhaust front pipe-to-underbody catalytic convertor (UCC).

  2. Object Number: 1774819  Size: SH
  3. Remove the nuts and gasket from the UCC-to-front muffler pipe.
  4. Remove the UCC assembly.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1774819  Size: SH
  1. Install the nuts and gasket to the UCC-to-front muffler pipe.
  2. Tighten
    Tighten the underbody catalytic converter-to-front muffler nuts to 30 N·m (22 lb ft).


    Object Number: 1860114  Size: SH
  3. Install the 3 nuts and gasket to the exhaust front pipe-to-UCC.
  4. Tighten
    Tighten the exhaust front pipe-to-underbody catalytic converter nuts to 30 N·m (22 lb ft).