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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 503 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support the vehicle.
  2. Disconnect the heated oxygen sensor (HO2S) wiring harness connector.
    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: HO2S Wiring Harness Connector
    G01759740Courtesy of GENERAL MOTORS CORP.
  6. Remove the right exhaust manifold pipe stud nuts.
  7. Remove the 3-way catalytic converter pipe.
  8. Remove the exhaust manifold pipe gasket.
    Fig 2: Right Exhaust Manifold Pipe Stud Nuts
    G01759741Courtesy of GENERAL MOTORS CORP.
  9. Remove the heated oxygen sensor (HO2S).
    Fig 3: HO2S
    G01759742Courtesy of GENERAL MOTORS CORP.
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