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For 1990-2009 cars only

Heated Oxygen Sensor Replacement - Sensor 2 FWD

Removal Procedure

    Notice: The heated oxygen sensors each use a permanently attached pigtail and connector. Do not remove the pigtail from the heated oxygen sensor. Damage or removal of the pigtail or the connector affects proper operation of the heated oxygen sensor. Handle the oxygen sensor carefully. Do not drop the oxygen sensor. Keep the in-line connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, the connector, or the terminals. Replace the oxygen sensor if the pigtail wiring, the terminals, or the connector is damaged. Proper oxygen sensor operation requires an external air reference. This external air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, the connectors, or the terminals results in the obstruction of the air reference and degrades the oxygen sensor performance. A dropped oxygen sensor is a bad oxygen sensor.

    Important: The HO2S may be difficult to remove at temperatures exceeding 48°C (120°F). Allow the engine to cool down before attempting to remove the HO2S. Use care in order to prevent any damage to the threads in the exhaust pipe.


    Object Number: 851369  Size: SH
  1. Remove the carpet retaining pin (1) from the front floor console (3).
  2. Pull back the carpet (2) from the area near the front floor console (3).

  3. Object Number: 851375  Size: SH
  4. Disconnect the HO2S 2 electrical connector (1).
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  6. Object Number: 851412  Size: SH
  7. Remove the HO2S 2 wiring pigtail and body plug from the floor pan.
  8. Remove the HO2S 2 (1) from the exhaust pipe.

Installation Procedure

Important: The HO2S 2 comes with an anti-seize coating on the new sensor. Take precautions in order to prevent removal of any of this coating prior to installation.


    Object Number: 851412  Size: SH
  1. Install the HO2S 2 (1) into the exhaust pipe.
  2. Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

  3. Tighten the HO2S 2.
  4. Tighten
    Tighten the HO2S 2 to 44 N·m (32 lb ft).

  5. Install the HO2S 2 wiring pigtail and body plug into the floor pan.
  6. Lower the vehicle.

  7. Object Number: 851369  Size: SH
  8. Connect the HO2S 2 electrical connector.
  9. Install the carpet (2) around the front floor console (3).
  10. Secure the carpet to the front floor console with the retaining pin (1).

Heated Oxygen Sensor Replacement - Sensor 2 AWD

Removal Procedure

    Notice: The heated oxygen sensors each use a permanently attached pigtail and connector. Do not remove the pigtail from the heated oxygen sensor. Damage or removal of the pigtail or the connector affects proper operation of the heated oxygen sensor. Handle the oxygen sensor carefully. Do not drop the oxygen sensor. Keep the in-line connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, the connector, or the terminals. Replace the oxygen sensor if the pigtail wiring, the terminals, or the connector is damaged. Proper oxygen sensor operation requires an external air reference. This external air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, the connectors, or the terminals results in the obstruction of the air reference and degrades the oxygen sensor performance. A dropped oxygen sensor is a bad oxygen sensor.

    Important: The HO2S may be difficult to remove at temperatures exceeding 48°C (120°F). Allow the engine to cool down before attempting to remove the HO2S. Use care in order to prevent any damage to the threads in the exhaust pipe.

  1. Remove the right side front seat assembly. Refer to Front Seat Replacement - Bucket in Seats.
  2. Remove the right door sill plate and carpet trim.
  3. Pull back the carpet under the seat and sill plate area.

  4. Object Number: 851408  Size: SH
  5. Disconnect the HO2S 2 electrical connector (1).
  6. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  7. Object Number: 851409  Size: SH
  8. Remove the HO2S 2 wiring pigtail and body plug (2) from the floor pan.
  9. Remove the HO2S 2 (1) from the exhaust pipe.

Installation Procedure

Important: The HO2S 2 comes with an anti-seize coating on the new sensor. Take precautions in order to prevent removal of any of this coating prior to installation.


    Object Number: 851409  Size: SH
  1. Install the HO2S 2 (1) into the exhaust pipe.
  2. Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

  3. Tighten the HO2S 2.
  4. Tighten
    Tighten the HO2S 2 to 44 N·m (32 lb ft).

  5. Install the HO2S 2 wiring pigtail and body plug (2) into the floor pan.
  6. Lower the vehicle.

  7. Object Number: 851408  Size: SH
  8. Connect the HO2S 2 wiring pigtail (2) to the HO2S harness connector (1).
  9. Relocate the carpet under the seat and the left sill plate area.
  10. Install the door sill plate and carpet trim.
  11. Install the front seat assembly. Refer to Front Seat Replacement - Bucket in Seats.