Catalytic Converter Replacement 2.2 L

Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.



2. Disconnect the heated oxygen sensor (HO2S) electrical connector.



3. Remove the catalytic converter to exhaust manifold pipe flange nuts.



4. Remove the muffler to the catalytic converter flange nuts.
5. Remove the catalytic converter from the muffler.



6. Remove the catalytic converter from the catalytic converter hanger.
7. Remove the catalytic converter from the vehicle.
8. Remove the heated oxygen sensor (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement in Engine Controls-2.2 L (L43).

1. Install the heated oxygen sensor (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement in Engine Controls-2.2 L (L43).
2. Install the catalytic converter and new gasket to the vehicle.
3. Install catalytic converter to the catalytic converter hanger.



4. Install a new gasket and the catalytic converter to the muffler.

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.

5. Install the catalytic converter to the muffler flange nuts.

Tighten
Tighten the catalytic converter to muffler flange nuts to 35 N·m (26 lb ft).




6. Install the catalytic converter to the exhaust manifold pipe flange nuts.

Tighten
Tighten the catalytic converter to the exhaust manifold pipe flange nuts to 35 N·m (26 lb ft).




7. Connect the heated oxygen sensor (HO2S) electrical connector.
8. Lower the vehicle.

Catalytic Converter Replacement 4.3 L Pickup

Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.



3. Disconnect the LH pre-converter heated oxygen sensor (HO2S) electrical connector.



4. Disconnect the RH pre-converter heated oxygen sensor (HO2S) electrical connector.



5. Disconnect the post-converter heated oxygen sensor (HO2S) connector.



6. Remove the muffler to the catalytic converter flange nuts.
7. Remove the catalytic converter from the muffler.



8. Remove the catalytic converter to exhaust manifold flange nuts.



9. Remove the catalytic converter from the rubber catalytic converter hanger.
10. Remove the catalytic converter and gaskets from the vehicle.
11. Remove the heated oxygen sensors (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 in Engine Controls-4.3 L.

1. Install the heated oxygen sensor (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 in Engine Controls-4.3 L.
2. Install a new gasket and the catalytic converter to the vehicle.
3. Install the catalytic converter to the rubber catalytic converter hanger.




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 the catalytic converter to exhaust manifold flange nuts.

Tighten
Tighten the catalytic converter to exhaust manifold nuts to 53 N·m (39 lb ft).




5. Install the new gasket and the catalytic converter to the muffler.
6. Install the catalytic converter to muffler flange nuts.

Tighten
Tighten the catalytic converter to muffler flange nuts to 40 N·m (30 lb ft).




7. Connect the post-converter heated oxygen sensor (HO2S) electrical connector.



8. Connect the RH pre-converter heated oxygen sensor (HO2S) electrical connector.



9. Connect the LH pre-converter heated oxygen sensor (HO2S) electrical connector.
10. Install the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
11. Lower the vehicle.

Catalytic Converter Replacement 4.3 L Utility

Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.



3. Disconnect the LH pre-converter heated oxygen sensor (HO2S) electrical connector.



4. Disconnect the RH pre-converter heated oxygen sensor (HO2S) electrical connector.



5. Disconnect the post-converter heated oxygen sensor (HO2S) electrical connector.



6. Remove the catalytic converter to muffler flange nuts.
7. Remove the catalytic converter from the muffler.



8. Remove the catalytic converter to exhaust manifold flange nuts.



9. Remove the catalytic converter from the rubber catalytic converter hangers.
10. Remove the catalytic converter and gasket from the vehicle.
11. Remove the heated oxygen sensors (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 in Engine Controls-4.3 L.

1. Install the heated oxygen sensors (HO2S) as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 in Engine Controls-4.3 L.
2. Install a new gasket and the catalytic converter to the vehicle.
3. Install the catalytic converter to the catalytic converter rubber 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 the catalytic converter to exhaust manifold flange nuts.

Tighten
Tighten the catalytic converter to exhaust manifold nuts to 53 N·m (39 lb ft).




5. Install a new gasket and the catalytic converter to the muffler.
6. Install the catalytic converter to the muffler flange nuts.

Tighten
Tighten the catalytic converter to muffler flange nuts to 40 N·m (30 lb ft).




7. Connect the post-converter heated oxygen sensor (HO2S) electrical connector.



8. Connect the RH pre-converter heated oxygen sensor (HO2S) electrical connector.



9. Connect the LH pre-converter heated oxygen sensor (HO2S) electrical connector.
10. Install the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
11. Lower the vehicle.