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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1318 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (3.1L) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
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 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.
  3. Support the exhaust system.
  4. Remove the catalytic converter bolts.
  5. Remove the catalytic converter gasket.
    Fig 1: Catalytic Converter Gasket & Bolts
    G01704091Courtesy of GENERAL MOTORS CORP.
  6. Remove the exhaust manifold pipe stud nuts.
  7. Remove the three way catalytic converter.
    Fig 2: Exhaust Manifold Pipe Stud Nuts
    G01704092Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust manifold pipe gasket.
    Fig 3: Exhaust Manifold Pipe Gasket
    G01704093Courtesy of GENERAL MOTORS CORP.
  9. Remove the heated oxygen (HO2S) sensor. Refer to HEATED OXYGEN SENSOR .
    Fig 4: Heated Oxygen (HO2S) Sensor
    G01704094Courtesy of GENERAL MOTORS CORP.
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