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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System - 4.8L, 5.3L & 6.0L (Introduction)) >> Repair Instructions >> Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: A special anti-seize compound is used on the 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 exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
    Fig 1: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Component Fastener Tightening Notice in Cautions and Notices.
  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S.

    Tighten:  Tighten the sensor to 42 N.m (31 lb ft).

    3. Fig 2: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  3. If equipped with a 6.0L engine, connect the HO2S electrical connector (1).
    4. Fig 3: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
  4. If equipped with a 4.8L or 5.3L engine, connect the HO2S electrical connector (1).
  5. Install the HO2S electrical connector to the fuel line clip.
  6. Disconnect the CPA retainer.
  7. If necessary, bolt the front propeller shaft to the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
  8. Lower the vehicle.
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