Installation Procedure

NOTE:

A special anti-seize compound is used on the heated oxygen sensor (HO2S) threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an engine and if for any reason the sensors are to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

If reusing the old HO2S sensors, coat the threads with special ant-seize compound. Refer to Adhesives, Fluids, Lubricants, and Sealers .

Fig 1: View Of HO2S Electrical Connector

Courtesy of GENERAL MOTORS COMPANY

Install the oxygen sensors to the catalytic converter. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
Install NEW seals to the exhaust manifolds.
Position the catalytic converter to the exhaust manifolds and the muffler.
Install the catalytic converter to muffler nuts, but do not completely tighten.

Fig 2: View Catalytic Converter

Courtesy of GENERAL MOTORS COMPANY

CAUTION:

Refer to Fastener Caution .

Install the catalytic converter nuts (1) to the exhaust manifold studs and tighten to 65 N.m (48 lb ft).

Fig 3: View Of Catalytic Converter Pipe And Muffler Nuts

Courtesy of GENERAL MOTORS COMPANY

Tighten the catalytic converter to muffler nuts to 48 N.m (35 lb ft).

Fig 4: View Of HO2S Electrical Connector

Courtesy of GENERAL MOTORS COMPANY

Connect the HO2S electrical connections to the main harness connectors.

CAUTION:

Refer to Exhaust System Inspection Caution .

Lower the vehicle and inspect for exhaust leaks.