Removal Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. 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 when servicing the 3-way catalytic converter assembly. Never install the original gaskets.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Disconnect the heated oxygen sensor (HO2S) electrical connector.
Remove the exhaust manifold pipe stud nuts.

Fig 1: View Of Catalytic Converter & Exhaust Manifold Pipe Stud Nuts

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Remove the catalytic converter nuts.

Fig 2: View Of Catalytic Converter Mounting Nuts

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Remove the catalytic converter hangers.

Fig 3: View Of Catalytic Converter Hangers

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Remove the 3-way catalytic converter.
Remove the gasket from the exhaust pipe.
Remove the gasket from the exhaust manifold.
Clean and inspect the exhaust manifold and the exhaust pipe gasket mating surfaces.
Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Position 2 in Engine Controls - 3.8L.

Fig 4: Removing HO2S From Catalytic Converter (3.8L)

Courtesy of GENERAL MOTORS CORP.