Installation Procedure

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Fig 1: View Of Oxygen Sensors

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

If the catalytic converter was replaced, perform the following:
1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.
2. Install the oxygen sensors.
  Tighten: Tighten the oxygen sensors to 42 N.m (31 lb ft).

Fig 2: View of Exhaust Seal At Exhaust Manifold

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Install a NEW exhaust seal to the exhaust manifold.
Install the catalytic converter.
Slide the catalytic converter hanger into the exhaust pipe hanger bracket.

Fig 3: Identifying Left Exhaust Manifold Pipe Nuts

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Install the left exhaust manifold pipe nuts.
Tighten: Tighten the exhaust manifold pipe nuts to 50 N.m (39 lb ft).

Fig 4: View Of Transmission & HO2S Sensor Electrical Connector

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Connect the oxygen sensor electrical connectors (1, 2).
Connect the CPA retainers.
Install the muffler. Refer to Muffler Replacement (4.8L and 5.3L Engines) or Muffler Replacement (6.0L and 8.1L Engines) .

Fig 5: View of Oil Pan Skid Plate & Bolts

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Install the oil pan skid plate and bolts, if necessary.
Tighten: Tighten the bolts to 20 N.m (15 lb ft).

Fig 6: View Of Engine Protection Shield

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Install the engine shield and bolts, if necessary.
Tighten: Tighten the bolts to 20 N.m (15 lb ft).
Lower the vehicle.