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Home >> Chevrolet >> 2009 >> TrailBlazer 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - Introduction >> Repair Instructions >> Heated Oxygen Sensor Replacement - Sensor 2 >> Removal Procedure
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Removal Procedure

CAUTION: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution .
CAUTION: Refer to Heated Oxygen and Oxygen Sensor Caution .
    Fig 1: View Of (HO2S) Electrical Connector & Engine Wiring Harness Electrical Connector
    GM1923755Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector (2) from the engine wiring harness electrical connector (1).
    3. Fig 2: View Of HO2S
    GM1923757Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Excessive Force and Oxygen Sensor Caution .
  3. Remove the HO2S (2). Use the J 39194-B  , if required. See Special Tools .
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