Removal Procedure

Servicing of the catalytic converter, resonator or pipe requires the replacement of the exhaust system as a complete one-piece unit.

1. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
2. Remove the oxygen sensor wiring harness heat shield. Refer to OXYGEN SENSOR WIRING HARNESS HEAT SHIELD REPLACEMENT  .
   Fig 1: Removing Catalytic Converter From Exhaust Manifold Pipe - Exhaust System Replacement

   Courtesy of GENERAL MOTORS CORP.
3. Disconnect the heated oxygen sensor at the pigtail.
4. Remove the heated oxygen sensor if replacement is necessary. Refer to DOWNSTREAM HEATED OXYGEN SENSOR in Engine Controls - 4.0 L.
5. Remove the four nuts securing the catalytic converter to the exhaust manifold pipe.
6. Remove the catalytic converter gasket. Do not reuse the gasket.
7. Suitably support the exhaust system.
8. Remove the two bolts securing the center exhaust hangers to the rear suspension support brackets.
   Fig 2: Removing Center Exhaust Hangers From Rear Suspension Support Brackets - Exhaust System Replacement

   Courtesy of GENERAL MOTORS CORP.
9. Remove the two bolts securing the rear exhaust hanger brackets to the rear compartment rails.
10. With the aid of an assistant, Lower the exhaust system.
    Fig 3: Lowering Exhaust System - Exhaust System Replacement

    Courtesy of GENERAL MOTORS CORP.
11. Remove the two nuts securing the rear exhaust hangers to the rear exhaust hanger brackets.
12. Remove the rear exhaust hanger brackets from the rear exhaust hangers.
    Fig 4: Removing Rear Exhaust Hanger Brackets From Rear Exhaust Hangers - Exhaust System Replacement

    Courtesy of GENERAL MOTORS CORP.