Breeze, Cirrus, Sebring Convertible and Sedan, Stratus Sedan, 1999-2005

Heated Oxygen Sensor

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Testing




WARNING
Be very careful when connecting the jumper wires; incorrect connection can damage the HO2S.

  1. Disconnect the heated oxygen sensor connector and connect special tool MB991658 to the connector on the heated oxygen sensor side.
  2.  
  3. Make sure that there is continuity of 11 - 18 Ohms at 20C (68F) between terminal 3 and terminal 4 on the heated oxygen sensor connector
  4.  
  5. If there is no continuity, replace the heated oxygen sensor.
  6.  
  7. Warm up the engine until engine coolant is 80C (176F).
  8.  
  9. Use the jumper wires to connect terminal 3 of the heated oxygen sensor connector to the positive battery terminal and terminal 4 to the negative battery terminal.
  10.  
  11. Connect a digital voltage meter between terminal 1 and terminal 2.
  12.  
  13. While repeatedly revving the engine, measure the heated oxygen sensor output voltage. If the sensor is defective, replace the heated oxygen sensor.
  14.  

Engine ConditionO2 Sensor Output VoltageRemarks
When revving engine0.6-1.0vNormal voltage response to richer a/f mixture caused by revving engine

Heated Oxygen Sensor Voltage Chart

Click image to see an enlarged view

Fig.



Click image to see an enlarged view

Fig.


WARNING
Be very careful when connecting the jumper wires; incorrect connection can damage the HO2S.

  1. Disconnect the heated oxygen sensor connector and connect special tool MB991658 to the connector on the heated oxygen sensor side.
  2.  
  3. Make sure that there is continuity of 11 - 18 Ohms at 20C (68F) between terminal 3 and terminal 4 on the heated oxygen sensor connector
  4.  
  5. If there is no continuity, replace the heated oxygen sensor.
  6.  
  7. Warm up the engine until engine coolant is 80C (176F).
  8.  
  9. Use the jumper wires to connect terminal 3 of the heated oxygen sensor connector to the positive battery terminal and terminal 4 to the negative battery terminal.
  10.  
  11. Connect a digital voltage meter between terminal 1 and terminal 2.
  12.  
  13. While repeatedly revving the engine, measure the heated oxygen sensor output voltage. If the sensor is defective, replace the heated oxygen sensor.
  14.  

Engine ConditionO2 Sensor Output VoltageRemarks
When revving engine0.6-1.0vNormal voltage response to richer a/f mixture caused by revving engine

Heated Oxygen Sensor Voltage Chart

Click image to see an enlarged view

Fig.



Click image to see an enlarged view

Fig.

 
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