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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - Introduction >> Repair Instructions >> Heated Oxygen Sensor Replacement - Sensor 1 >> Special Tools >> Removal Procedure
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Removal Procedure

    Fig 1: View Of ECT Sensor, Fuel Injector, Ignition Coil & HO2S Engine Wiring Harness Electrical Connectors
    GM1350694Courtesy of GENERAL MOTORS CORP.
  1. Remove the right front fender wheelhouse panel. Refer to Front Wheelhouse Liner Replacement .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector (5) from the following:
    • The engine wiring harness electrical connector
    • The camshaft cover
    3. Fig 2: View Of HO2S - Position 1
    GM1352009Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Excessive Force and Oxygen Sensor Caution .
  3. Using the J-39194-B:  wrench remove the HO2S from the exhaust manifold.
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