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Home › Isuzu › 2008 › Ascender LS, RWD › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 4.2L - Introduction (2 Of 2) › Repair Instructions › Heated Oxygen Sensor 1 Replacement › Installation Procedure

Installation Procedure

IMPORTANT: A special anti-seize compound is used 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: View Of HO2S Electrical Connector
    GM1923757Courtesy of GENERAL MOTORS CORP.
  1. If reinstalling the old sensor, coat the threads with the anti-seize compound P/N 12377953, or equivalent.
    2. NOTE: Refer to Component Fastener Tightening Notice .
  2. Install the HO2S (1). Use the J 39194-B  , if required. See Special Tools .

    Tighten:  Tighten the HO2S to 42 N.m (31 lb ft).

    3. Fig 2: View Of Electrical Connectors
    GM1923753Courtesy of GENERAL MOTORS CORP.
  3. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (1).
  4. Install the HO2S electrical connector (1) clip to the transmission fluid fill tube bracket.
  5. Install the CPA retainer to the HO2S connection.
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