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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - Introduction (2 Of 2)) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) >> Installation Procedure

Installation Procedure

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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 Catalytic Converter Assembly HO2S's
    GM1704008Courtesy 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 or 2).

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

    3. Fig 2: View Of Left Front HO2S Electrical Connector Clip & Engine Wiring Harness Electrical Connector
    GM1704004Courtesy of GENERAL MOTORS CORP.
  3. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step  7.
  4. Install the HO2S electrical connector clip (1) to the fuel line clip.
  5. Connect the engine wiring harness electrical connector (2) to the HO2S.
  6. Install the CPA retainer.
    7. Fig 3: View Of Engine Wiring Harness Electrical Connector Clip & Electrical Connector
    GM1704002Courtesy of GENERAL MOTORS CORP.
  7. Connect the engine wiring harness electrical connector (3) to the HO2S.
  8. Install the engine wiring harness electrical connector clip (1) to the fuel line clip.
  9. Install the CPA retainer (2).
  10. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to Front Propeller Shaft Replacement .
  11. Lower the vehicle.
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