Catalytic Converter: Service and Repair

Catalytic Converter Replacement

Removal Procedure

Caution: Refer to Exhaust Service Caution in Service Precautions.

Caution: Refer to Protective Goggles and Gloves Caution in Service Precautions.

1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.





2. Remove the Connector Position Assurance (CPA) locks.
3. Disconnect the oxygen sensor electrical connectors.
4. Remove the oxygen sensor clips to the heat shields.

Notice: Refer to Oxygen Sensor Notice in Service Precautions.

5. Remove the oxygen sensors.





6. Remove the exhaust manifold nuts.
7. Install adjustable jack stands under the front and rear of the catalytic converter.





8. Remove the exhaust pipe hanger lower bolts.





9. Remove the exhaust pipe brace lower bolts.





10. Remove the exhaust muffler bolts.
11. Remove the exhaust muffler gaskets.
12. Lower the jack stands.





13. With the aid of an assistant remove the catalytic converter from the jack stands.

Installation Procedure

Notice: Refer to Exhaust System Inspection Notice in Service Precautions.





1. With the aid of an assistant install the catalytic converter to the jack stands.
2. Raise the jack stands in order to position the catalytic converter.
3. Install NEW exhaust muffler gaskets.
4. Install ALL exhaust bolts until snug to ensure correct alignment of the catalytic converter.
5. Remove the adjustable jack stands.

Notice: Refer to Fastener Notice in Service Precautions.





6. Tighten the exhaust muffler bolts in the following sequence:
6.1. Left inboard
6.2. Left outboard
6.3. Right inboard
6.4. Right outboard
Tighten the exhaust muffler bolts to 50 Nm (37 ft. lbs.).





7. Tighten the exhaust manifold nuts.
Tighten the exhaust manifold nuts to 20 Nm (15 ft. lbs.).





8. Tighten the exhaust pipe brace lower bolts.
Tighten the exhaust pipe brace bolts to 50 Nm (37 ft. lbs.).





9. Tighten the exhaust pipe hanger lower bolts.
Tighten the exhaust pipe hanger bolts to 50 Nm (37 ft. lbs.).
10. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the oxygen sensor.

Notice: Refer to Oxygen Sensor Notice in Service Precautions.





11. Install the oxygen sensors.
Tighten the oxygen sensors to 42 Nm (30 ft. lbs.).
12. Install the oxygen sensor clips to the heat shields.
13. Connect the oxygen sensor electrical connectors.
14. Install the CPA locks.
15. Lower the vehicle.