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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 229 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - Introduction (2 Of 2)) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
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 Exhaust Sensors
    GM1960379Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Component Fastener Tightening Notice .
  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (1).

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

    3. Fig 2: Locating HO2S & Components
    GM1960351Courtesy of GENERAL MOTORS CORP.
  3. Connect the engine wiring harness electrical connector (7) to the HO2S.
  4. Install the engine wiring harness electrical connector clip (6) to the fuel line clip.
  5. Install the CPA retainer (4).
  6. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to Front Propeller Shaft Replacement .
  7. Lower the vehicle.
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