Removal Procedure

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 assembly. Never reinstall the original gasket.

1. Raise and support the vehicle. Refer to LIFTING & JACKING THE VEHICLE .
2. Disconnect the heated oxygen (HO2S) sensor wiring harness connector and retainers.
   NOTE: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.
3. Support the exhaust system.
4. Remove the catalytic converter bolts.
5. Remove the catalytic converter gasket.
Fig 1: Catalytic Converter Gasket & Bolts
Courtesy of GENERAL MOTORS CORP.
6. Remove the exhaust manifold pipe stud nuts.
7. Remove the three way catalytic converter.
8. Remove the exhaust manifold pipe gasket at the exhaust manifold pipe studs.
   Fig 2: Exhaust Manifold Pipe Stud Nuts

   Courtesy of GENERAL MOTORS CORP.
9. Remove the heated oxygen (HO2S) sensor. Refer to HEATED OXYGEN SENSOR .
   Fig 3: Heated Oxygen (HO2S) Sensor

   Courtesy of GENERAL MOTORS CORP.