Installation Procedure

NOTE: Refer to EXHAUST SYSTEM INSPECTION NOTICE in Cautions and Notices.

Fig 1: Exhaust System

Courtesy of GENERAL MOTORS CORP.

With the aid of an assistant, raise the exhaust system.
Install the rear exhaust hanger to hanger bracket studs.
Install the rear exhaust hanger to hanger bracket nuts.
Tighten: Tighten the nuts to 30 N.m (22 lb ft).

Fig 2: Catalytic Converter

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Install a NEW catalytic converter gasket onto the studs.
Install the catalytic converter to the rear exhaust manifold pipe.
Install and snug the catalytic converter to the rear exhaust manifold pipe nuts.

Fig 3: Exhaust Hanger Bracket

Courtesy of GENERAL MOTORS CORP.

Install the rear exhaust hanger bracket to the rear compartment side rail bolts.
Tighten: Tighten the bolts to 50 N.m (37 lb ft).

Fig 4: Exhaust Hanger

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Install the exhaust hanger to the rear suspension support bracket bolts.
Tighten: Tighten the bolts to 30 N.m (22 lb ft).
Tighten the catalytic converter to the rear exhaust manifold pipe nuts previously installed.
Tighten: Tighten the nuts to 25 N.m (18 lb ft).

Fig 5: HO2S

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If reusing the old HO2S, coat the threads with anti-seize compound, GM P/N 12377953 or equivalent.
Install the HO2S.
Tighten: Tighten the sensor to 41 N.m (30 lb ft).

Fig 6: HO2S Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the HO2S electrical connector.
Install the CPA retainer.
Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .