Subaru Car 1998-05

Heated Oxygen Sensor 2

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Testing



3.0L Engine
Front Sensor
  1. Turn the ignition switch OFF.
  2.  
  3. Measure the resistance between the sensor connector terminals (terminals 1 and 2).
  4.  
  5. If resistance is more than 10 ohm, replace the sensor.
  6.  

  1. Measure the resistance between the sensor connector terminals (terminals 1 and 2).
  2.  
  3. If resistance is more than 5 ohm, replace the sensor.

    Click image to see an enlarged view

    Fig. Front oxygen sensor connector location-Legacy and Outback 2002-2004 3.0L engine



    Click image to see an enlarged view

    Fig. Front oxygen sensor connector location-Legacy and Outback 2005 3.0L engine

  4.  

Rear Sensor

Perform a visual inspection of the sensor as follows:

  1. If the sensor tip has a black/sooty deposit, this may indicate a rich fuel mixture.
  2.  
  3. If the sensor tip has a white, gritty deposit, this may indicate an internal coolant leak.
  4.  
  5. If the sensor tip has a brown deposit, this could indicate oil consumption.
  6.  
  7. Turn the ignition switch OFF.
  8.  
  9. Measure the resistance of the harness between the sensor connector terminals (terminals 1 and 2).
  10.  
  11. If measured value is more than 30ohm, replace the sensor.

    Click image to see an enlarged view

    Fig. Rear oxygen sensor connector location-Legacy and Outback 2002-2004 3.0L engine



    Click image to see an enlarged view

    Fig. Rear oxygen sensor connector location-Legacy and Outback 2005 3.0L engine

  12.  

 
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