Catalytic Converter Replacement Gasoline

1. Raise the vehicle and support with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
2. Disconnect the oxygen sensor connectors.
3. Remove the flange nuts at the front of the converter assembly.



4. Remove the clamps at the rear of the converter.
5. Support the manifold/exhaust pipe, in front of the converter, before removing the converter.
6. Remove the converter from the exhaust hangers.
7. Remove the converter from the exhaust pipe.

1. Apply sealer GM P/N 9984226 or equivalent at the slip-joint connections.



2. Install a new gaskets between the flat flange joints at the front of the converter.
3. Install the new catalytic converter into the exhaust pipe.
4. Install the converter in the exhaust hangers.
5. Install new U-bolts and clamps at the rear of the converter.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

6. Install new nuts at the front of the converter.

Tighten

•	U-bolt nuts to 52 N·m (38 lb ft)

•	Converter nuts to 48 N·m (35 lb ft)

7. Connect the oxygen sensor connectors.
8. Check for proper clearance and alignment.
9. Lower the vehicle.

Catalytic Converter Replacement Diesel

1. Raise the vehicle and support with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the clamps at the front and rear of the converter.
3. Support the manifold/exhaust pipe, in front of the converter, before removing the converter.
4. Remove the exhaust pipe from the exhaust hangers.
5. Remove the converter from the exhaust pipe.

1. Apply sealer GM P/N 9984226 or equivalent at the slip-joint connections.
2. Install the new catalytic converter into the exhaust pipe.
3. Install the exhaust pipe in the exhaust hangers.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install new U-bolts and clamps at the front and rear of the converter.

Tighten
U-bolt nuts to 52 N·m (38 lb ft)

5. Check for proper clearance and alignment.
6. Lower the vehicle.