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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1957 (Engine Controls And Fuel - 3.5L - Introduction) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution .
    Fig 1: Engine Wiring Harness Electrical Connector
    GM1883804Courtesy of GENERAL MOTORS CORP.
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Remove the connector position assurance (CPA) retainer.
  3. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensor (HO2S) electrical connector (2).
  4. Remove the HO2S electrical connector rosebud clip from the engine wiring harness retaining strap (6).
    5. Fig 2: Heated Oxygen Sensors
    GM1883810Courtesy of GENERAL MOTORS CORP.
    CAUTION: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.
  5. Remove the HO2S (4). Use the J 39194-B  , if necessary. See Special Tools .
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