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Removal Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Right Exhaust Manifold & Catalytic Converter Pipe
    GM911163Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The catalytic converter is serviced by replacing the entire assembly. Always replace the gaskets at the front and rear flanges when servicing the catalytic converter. Never install the original gasket.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  3. Remove the exhaust manifold pipe stud nuts (2).
  4. Remove the exhaust manifold pipe gasket (1).
  5. Support the exhaust system.
    6. Fig 2: View Of Catalytic Converter Mounting Nuts
    GM212193Courtesy of GENERAL MOTORS CORP.
  6. Remove the catalytic converter nuts.
    7. Fig 3: View Of Catalytic Converter Hangers
    GM289493Courtesy of GENERAL MOTORS CORP.
  7. Remove the catalytic converter hangers.
  8. Remove the catalytic converter.
  9. Remove the catalytic converter gasket.
  10. Clean and inspect the exhaust manifold and the exhaust pipe gasket mating surfaces.
  11. Remove the HO2S. Refer to Heated Oxygen Sensor 2 Replacement .
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