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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1843 (Engine Controls And Fuel - 3.5L (L66) - Introduction (2 Of 2)) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Heated Oxygen Sensor (HO2S)
    GM1228627Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Bank 1 are cylinders 1, 3, and 5 which are the closest to the front of the dash.
  1. Turn the ignition OFF.
  2. Disconnect the bank 1 heated oxygen sensor 2 harness connector (2).
  3. Disconnect the connectors from the retaining bracket.
  4. Remove the heated oxygen sensor connector retaining bracket and bolt.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  6. Remove the heated oxygen sensor wiring harness bracket and bolt.
    7. Fig 2: View Of Heated Oxygen Sensor
    GM1226398Courtesy of GENERAL MOTORS CORP.
    CAUTION: Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.
  7. Remove the bank 1 heated oxygen sensor 2 using the J 39194-C  .
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