Vue 2006-2007

Heated Oxygen Sensor

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Operation



Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by the ignition 1 voltage circuit through a fuse. With the engine running, a ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Powertrain Control Module (PCM). The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM monitors the voltage on the HO2S heater low control circuit for heater fault diagnosis. If the PCM detects that the HO2S heater low control circuit voltage is not within a specified range, a DTC is set.

Removal & Installation



2.2L Engines
Sensor 1

Tool Required:



J 39194-C O2 Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    WARNING
    The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the HO2S. Damage to, or removal of, the pigtail or connector could affect proper operation of the sensor.

  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the HO2S-1 harness connector.
  6.  
  7. Remove the sensor harness and connector from the attachment clip.
  8.  
  9. Use a liquid penetrate before removing the sensor.
    NOTE
    Removal of the sensor is easier if the exhaust system is slightly warmed up. Be careful that the exhaust is not too hot to work on safely. Moving the sensor back and forth while applying penetrating oil to the threads will aid in removal and will decrease the chance of exhaust pipe thread damage.

  10.  
  11. Remove the H02S-1 using the J 39194-C, or equivalent.
  12.  

To install:


WARNING
Silicone based products will contaminate the HO2S. Use only a nickel based anti-seize compound that does not contain silicone.

  1. Apply a small amount of anti-seize compound Saturn P/N 21485279, or equivalent, to the threads of the HO2S-1.
  2.  
  3. Install the HO2S-1 using the J 39194-C, or equivalent. Tighten the oxygen sensor-to-exhaust manifold pipe to 33 ft. lbs. (45 Nm).
  4.  
  5. Install the sensor harness and connector to the attachment clip.
  6.  
  7. Connect the HO2S-1 harness connector. Push in the connector until a click is heard and pull back to confirm a positive engagement.
  8.  

Sensor 2

Tool Required:



J 39194-C O2 Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    WARNING
    The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the HO2S. Damage to, or removal of, the pigtail or connector could affect proper operation of the sensor.

  2.  
  3. Turn the ignition OFF.
    CAUTION
    Ensure that the vehicle is properly supported and squarely positioned. To help avoid personal injury when a vehicle is on a hoist, provide additional support for the vehicle on the opposite end from which the components are being removed.

  4.  
  5. Raise the vehicle.
  6.  
  7. Disconnect the HO2S-2 harness connector.
  8.  
  9. Remove the HO2S-2 harness clip from the heat shield attachment.
  10.  
  11. Use a liquid penetrate before removing the sensor.
  12.  
  13. Remove the HO2S-2 using the J 39194-C, or equivalent.
  14.  

To install:


WARNING
Silicone based products will contaminate the HO2S. Use only a nickel based anti-seize compound that does not contain silicone.

  1. Apply a small amount of anti-seize compound Saturn P/N 21485279, or equivalent, to the threads of the HO2S-2.
  2.  
  3. Install the HO2S-2 using the J 39194-C, or equivalent. Tighten the HO2S-2 sensor-to-exhaust pipe to 33 ft. lbs. (45 Nm).
    NOTE
    Do Not apply any material in the HO2S-2 harness connector such as grease or dielectric compound. The wires carry air reference to the sensor in order for the sensor to operate properly.

  4.  
  5. Install the HO2S-2 harness clip to the heat shield attachment bolt. Tighten the bolt to 35 inch lbs. (4 Nm).
  6.  
  7. Connect the HO2S-2 harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
  8.  
  9. Ensure the HO2S-2 harness pigtail connector is secure to the chassis.
  10.  

2.4L Engine
Sensor 1

Tool Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    WARNING
    The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the HO2S. Damage to, or removal of, the pigtail or connector could affect proper operation of the sensor.


    WARNING
    The use of excessive force may damage the threads in the exhaust manifold/pipe.


    NOTE
    The in-line connector and louvered end must be kept clear of grease, dirt, or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the Heated Oxygen Sensor (HO2S).


    NOTE
    The HO2S may be difficult to remove when the engine temperature is less than 120°F (48°C).

  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the Connector Position Assurance (CPA) retainer.
  6.  
  7. Disconnect the engine wiring harness electrical connector from the HO2S.
  8.  
  9. Remove the HO2S connector clip from the thermostat housing.
  10.  
  11. Remove the HO2S using the J 39194-C.
  12.  

To install:


NOTE
A special anti-seize compound is used on the heated oxygen sensor threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service replacement sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied prior to installation.

  1. If necessary, coat the threads of the HO2S with anti-seize compound Saturn P/N 21485279 or equivalent.
  2.  
  3. Install the HO2S using the J 39194-C. Tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. Install the HO2S connector clip to the thermostat housing.
  6.  
  7. Connect the engine wiring harness electrical connector to the HO2S.
  8.  
  9. Install the CPA retainer.
  10.  

Sensor 2

Tool Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    WARNING
    The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the HO2S. Damage to, or removal of, the pigtail or connector could affect proper operation of the sensor.


    WARNING
    The use of excessive force may damage the threads in the exhaust manifold/pipe.


    NOTE
    The in-line connector and louvered end must be kept clear of grease, dirt, or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the Heated Oxygen Sensor (HO2S).


    NOTE
    The HO2S may be difficult to remove when the engine temperature is less than 120°F (48°C).

  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the Connector Position Assurance (CPA) retainer.
  6.  
  7. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector.
  8.  
  9. Remove the HO2S wiring pigtail from the heat shield crimp.
  10.  
  11. Remove the HO2S using the J 39194.
  12.  

To install:


NOTE
A special anti-seize compound is used on the heated oxygen sensor threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service replacement sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied prior to installation.

  1. If necessary, coat the threads of the HO2S with anti-seize compound Saturn P/N 21485279 or equivalent.
  2.  
  3. Install the HO2S using the J 39194-C. Tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. Install the HO2S wiring pigtail to the heat shield crimp.
  6.  
  7. Connect the HO2S electrical connector to the engine wiring harness electrical connector.
  8.  
  9. Install the CPA retainer.
  10.  
  11. Lower the vehicle.
  12.  

3.5L Engine
Bank 1 Sensor 1

Tools Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Bank 1 includes cylinders 1, 3, and 5 which are closest to the front of the dash.

  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the bank 1 heated oxygen sensor 1 harness connector.
    NOTE
    Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.

  6.  
  7. Remove the oxygen sensor using the J 39194-C.
  8.  

To install:

  1. Apply a small amount of the anti-seize compound SA P/N 21485279, or equivalent, to the threads of the heated oxygen sensor 1.
  2.  
  3. Install the heated oxygen sensor 1 using the J 39194-C. Tighten the oxygen sensor to 33 ft. lbs. (44 Nm).
  4.  
  5. Attach the bank 1 heated oxygen sensor 1 harness connector. Make sure the locking tab is in the full closed position.
  6.  
  7. Start the engine and make sure no exhaust leaks exist.
  8.  

Bank 1 Sensor 2

Tools Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Bank 1 includes cylinders 1, 3, and 5 which are the closest to the front of the dash.

  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the bank 1 heated oxygen sensor 2 harness connector.
  6.  
  7. Disconnect the connectors from the retaining bracket.
  8.  
  9. Remove the heated oxygen sensor connector retaining bracket and bolt.
  10.  
  11. Raise and support the vehicle.
  12.  
  13. Remove the heated oxygen sensor wiring harness bracket and bolt.
    NOTE
    Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.

  14.  
  15. Remove the bank 1 heated oxygen sensor 2 using the J 39194-C.
  16.  

To install:

  1. Apply a small amount of anti-seize compound SA P/N 21485279, or equivalent, to the threads of the heated sensor 2.
  2.  
  3. Install the bank 1 heated oxygen sensor 2 using the J 39194-C. Tighten the oxygen sensor to 33 ft. lbs. (44 Nm).
  4.  
  5. Install the heated oxygen sensor wiring harness bracket and bolt. Tighten the bolt to 89 inch lbs. (10 Nm).
  6.  
  7. Lower the vehicle.
  8.  
  9. Install the heated oxygen sensor connector retaining bracket and bolt. Tighten the bolt to 89 inch lbs. (10 Nm).
  10.  
  11. Connect the bank 1 heated oxygen sensor 2 harness connector. Make sure the locking tab is in the full closed position.
  12.  
  13. Connect the connectors to the retaining bracket.
  14.  
  15. Start the engine and make sure no exhaust leaks exist.
  16.  

Bank 2 Sensor 1

Tools Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Bank 2 includes cylinders 2, 4, and 6 which are closest to the front of the vehicle.

  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the bank 2 heated oxygen sensor 1 harness connector.
    NOTE
    Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.

  6.  
  7. Remove the bank 2 heated oxygen sensor 1 using the J 39194-C.
  8.  

To install:

  1. Apply a small amount of the anti-seize compound SA P/N 21485279, or equivalent, to the threads of the heated oxygen sensor.
  2.  
  3. Install the bank 2 heated oxygen sensor 1 using the J 39194-C. Tighten the oxygen sensors (exhaust manifold) to 33 ft. lbs. (44 Nm).
  4.  
  5. Connect the heated oxygen sensor harness connector. Make sure the locking tab is in the full closed position.
  6.  
  7. Start the engine and make sure no exhaust leaks exist.
  8.  

Bank 2 Sensor 2

Tools Required:



J 39194-C Oxygen Sensor Wrench
 

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Bank 2 includes cylinders 2, 4, and 6 which are closest to the front of the vehicle.

  2.  
  3. Turn the ignition OFF.
  4.  
  5. Disconnect the bank 2 heated oxygen sensor 2 harness connector and disconnect from the retaining bracket.
  6.  
  7. Raise and support the vehicle.
  8.  
  9. Remove the left transaxle mount just enough to gain access to the heated oxygen sensor.
  10.  
  11. Remove the heated oxygen sensor wiring harness bracket and bolt.
    NOTE
    Removal of the sensor is easier if the exhaust system is warmed up slightly. Be careful that it is not too hot to work on safely. Applying penetrating oil to the threads while moving the sensor back and forth will also aid in removal and will decrease the chance of exhaust pipe thread damage.

  12.  
  13. Remove the bank 2 heated oxygen sensor 2 using the J 39194-C.
  14.  

To install:

  1. Apply a small amount of the anti-seize compound SA P/N 21485279, or equivalent, to the threads of the heated oxygen sensor.
  2.  
  3. Install the bank 2 heated oxygen sensor 2 using the J 39194-C. Tighten the oxygen sensors (exhaust manifold) to 33 ft. lbs. (44 Nm).
  4.  
  5. Install the heated oxygen sensor wiring harness bracket and bolt. Tighten the bolt to 30 ft. lbs. (40 Nm).
  6.  
  7. Install the left transaxle mount.
  8.  
  9. Lower the vehicle.
  10.  
  11. Connect the heated oxygen sensor harness connector. Make sure the locking tab is in the full closed position.
  12.  
  13. Start the engine and make sure no exhaust leaks exist.
  14.  

Testing





Click image to see an enlarged view

Fig. Heated Oxygen (HO2S) connector end view (sensor 1)-2.2L engine



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Fig. Heated Oxygen (HO2S) connector end view (sensor 2)-2.2L engine



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Fig. Heated Oxygen (HO2S) connector end view (sensor 1)-2.4L engine



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Fig. Heated Oxygen (HO2S) connector end view (sensor 2)-2.4L engine



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Fig. Heated Oxygen (HO2S) connector end view (bank 1, sensor 1)-3.5L engine



Click image to see an enlarged view

Fig. Heated Oxygen (HO2S) connector end view (bank 1, sensor 2)-3.5L engine



Click image to see an enlarged view

Fig. Heated Oxygen (HO2S) connector end view (bank 2, sensor 1)-3.5L engine



Click image to see an enlarged view

Fig. Heated Oxygen (HO2S) connector end view (bank 2, sensor 2)-3.5L engine

  1. With an OBD2 scan tool connected to the datalink port:
    1. Start the engine and allow it to reach normal operating temperature.
    2.  
    3. If the engine is at operating temperature when started, wait 15 seconds to allow the Heated Oxygen Sensor (HO2S) heater current to stabilize.
    4.  
    5. Observe the affected HO2S heater parameter with a scan tool.
    6.  
    7. The HO2S heater parameter should be within the specified range: 0.5-2.0 Amps.
    8.  

  2.  
  3. Replace the affected HO2S as necessary.
  4.  
  5. Probe for circuit voltage:
    1. Turn engine OFF.
    2.  
    3. Disconnect the affected HO2S.
    4.  
    5. Turn ON the ignition, with the engine OFF.
    6.  
    7. Probe the ignition 1 voltage circuit of the HO2S harness connector on the engine harness side with a test lamp that is connected to a good ground.
    8.  
    9. The test lamp should illuminate.
    10.  

  6.  
  7. Test the ground circuit:
    1. Turn OFF the ignition.
    2.  
    3. Probe the HO2S heater low control circuit of the HO2S harness connector on the engine harness side with a test lamp connected to battery voltage.
    4.  
    5. With the ignition still OFF, observe the test lamp.
    6.  
    7. The test lamp should illuminate.
    8.  

  8.  
  9. If the ECM and all circuits test normal, replace the appropriate HO2S.
  10.  

 
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