LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 2007 >> Relay 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - Introduction (2 Of 2) >> Repair Instructions >> Heated Oxygen Sensor 2 Replacement >> Installation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 burn 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: Removing/Installing HO2S From Catalytic Converter (FWD)
    GM1681800Courtesy of GENERAL MOTORS CORP.
  1. If re-installing the old sensor, coat the threads with anti-seize compound P/N 12377953 or equivalent.
    2. NOTE: Refer to Fastener Notice .
  2. Install the HO2S to the catalytic converter.

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

    3. Fig 2: Disconnecting/Connecting HO2S Electrical Connector
    GM1681413Courtesy of GENERAL MOTORS CORP.
  3. Connect the engine harness electrical connector to the HO2S connector.
  4. Install the CPA retainer.
  5. Lower the vehicle.
scientia non olet · About LEMON Manuals