Removal Procedure

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Important: The 3-way catalytic converter is serviced by replacing the entire assembly. Always replace the gaskets at the front and rear flanges when servicing the 3-way catalytic converter. Never reinstall the original gasket.

Fig 1: Catalytic Converter Gaskets

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Raise and support the vehicle.
Disconnect the heated oxygen sensor (HO2S) electrical connector and retainers. Refer to HEATED OXYGEN SENSOR .
Support the exhaust system.
Remove the catalytic converter hangers.
Remove the catalytic converter bolts.
Remove the catalytic converter gasket.

Fig 2: Catalytic Converter Bolts And Gasket
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Remove the exhaust manifold pipe stud nuts.
Remove the 3-way catalytic converter.

Fig 3: Exhaust Manifold Pipe Stud Nuts
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Remove the exhaust manifold pipe gasket.

Fig 4: Exhaust Manifold Pipe Gasket
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Remove the heated oxygen sensor (HO2S). Refer to HEATED OXYGEN SENSOR

Fig 5: Heated Oxygen Sensor (HO2S)
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