Removal Procedure

Important:  The three way catalytic converter is serviced by replacing the entire assembly. Always replace the gaskets at the front and rear flanges when servicing the three way catalytic converter. Never install the original gasket.

1. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
3. Remove the exhaust manifold pipe stud nuts.
4. Remove the exhaust manifold pipe gasket.
5. Support the exhaust system.
   Fig 1: Removing Exhaust Manifold Pipe Stud Nuts

   Courtesy of GENERAL MOTORS CORP.
6. Remove the catalytic converter nuts.
   Fig 2: Removing Catalytic Converter Nuts

   Courtesy of GENERAL MOTORS CORP.
7. Remove the catalytic converter hangers.
8. Remove the 3-way catalytic converter.
9. Remove the catalytic converter gasket.
10. Clean and inspect the exhaust manifold and the exhaust pipe gasket mating surfaces.
    Fig 3: Removing Catalytic Converter Hangers

    Courtesy of GENERAL MOTORS CORP.
11. Remove the heated oxygen sensor (HO2S). Refer to HEATED OXYGEN SENSOR in Engine Performance - Removal & Installation
    Fig 4: Removing Heated Oxygen Sensor

    Courtesy of GENERAL MOTORS CORP.