Installation Procedure

NOTE: When inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to prevent overheating of the floor pan and possible damage to the passenger compartment insulation and trim materials.

Fig 1: View Of Rear Exhaust Hanger To Hanger Bracket Nuts

Courtesy of GENERAL MOTORS CORP.

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

Fig 2: Installing 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: View Of Rear Exhaust Hanger Bracket To Rear Compartment Side Rail Bolts

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: View Of Exhaust Hanger To Rear Suspension Support Bracket Bolts

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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: Identifying 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: Identifying HO2S Electrical Connector

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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 .