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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 978 (Engine Controls - 4.3L (Introduction)) >> Repair Instructions >> Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the heated oxygen sensor (HO2S) connector from the crossmember, if equipped with a manual transmission and 2-wheel drive (2WD).
  3. Disconnect the connector position assurance (CPA) retainer.
    NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.
  4. Disconnect the HO2S electrical connector from the harness (2).
    5. Fig 1: Locating HO2S Electrical Connector At Harness (Manual 2WD)
    GM772343Courtesy of GENERAL MOTORS CORP.
  5. Remove the HO2S connector from the crossmember, if equipped with a automatic transmission and 2WD.
  6. Disconnect the CPA retainer.
  7. Disconnect the HO2S electrical connector from the harness.
    8. Fig 2: View Of HO2S Electrical Connector At Harness (Automatic 2WD)
    GM815070Courtesy of GENERAL MOTORS CORP.
  8. Remove the HO2S connector from the crossmember, if equipped with 4-wheel drive (4WD).
  9. Disconnect the CPA retainer.
  10. Disconnect the HO2S electrical connector from the harness.
    11. Fig 3: View Of HO2S Electrical Connector At Harness (4WD)
    GM815068Courtesy of GENERAL MOTORS CORP.
  11. Remove the bank 2 HO2S (2).
    12. Fig 4: View Of Bank 1 & 2 HO2S
    GM815044Courtesy of GENERAL MOTORS CORP.
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