Removal Procedure

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Use a utility stand to support the catalytic converter.
Disconnect the oxygen sensor electrical connector.

Fig 1: Identifying Catalytic Converter Nuts

Courtesy of GENERAL MOTORS CORP.

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.

Remove the catalytic converter nuts from the exhaust manifold.
Disconnect the catalytic converter from the catalytic converter hangers.
Reposition the exhaust system in order to access the exhaust seal.

Fig 2: Exhaust Manifold Pipe Gasket

Courtesy of GENERAL MOTORS CORP.

Remove the catalytic converter seal.