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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System & Fuel System - 5.3L - Introduction (2 Of 2)) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 >> Installation Procedure

Installation Procedure

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IMPORTANT: A special anti-seize compound is use on the heated oxygen sensor (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: Identifying HO2S
    GM1553063Courtesy 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. NOTE: Refer to Fastener Notice .
  2. Install the bank 2 sensor 2 to the catalytic converter.

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

    3. Fig 2: Identifying Bank 2 Sensor 2 Electrical Harness Connector
    GM1553099Courtesy of GENERAL MOTORS CORP.
  3. Connect the bank 2 sensor 2 electrical connector.
  4. Install the CPA retainer.
  5. Lower the vehicle.
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