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Home >> Chevrolet >> 2009 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - Introduction >> Repair Instructions >> Heated Oxygen Sensor 2 Replacement >> Installation Procedure
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Installation Procedure

NOTE: A special anti-seize compound is use on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burns away, but the glass beads remain, making the sensor easier to remove. New or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.
    Fig 1: Locating HO2S
    GM1618528Courtesy of GENERAL MOTORS CORP.
  1. If re-installing the old sensor, coat the threads with the anti-seize compound P/N 12377953, or equivalent.
    2. CAUTION: Refer to Fastener Caution .
  2. Install the HO2S to the catalytic converter.

    Tighten:  Tighten the sensor to 42 N.m (31 lb ft).

    3. Fig 2: View Of HO2S Electrical Connector
    GM1618526Courtesy of GENERAL MOTORS CORP.
  3. Connect the HO2S electrical connector (3).
  4. Install the CPA retainer (1).
  5. Install the HO2S electrical connector clip to the heat shield.
  6. Lower the vehicle.
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