Volkswagen Cars 2000-05

Heated Oxygen Sensor

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Testing



Heater Circuit

To check the heated circuit of the O 2 S sensor:

  1. With the ignition OFF, check the resistance between terminal Nos. 1 and 2 of the O 2 S sensor connector. At room temperature the resistance should be 0.0-24.2 ohms.
  2.  
  3. With the ignition OFF and the O 2 S sensor disconnected, use a suitable DMM to check the voltage between terminal Nos. 1 (+) and 2 (-). Start the engine and allow the engine to idle. The reading should be about 12-14 volts. If the voltage is not present, check the fuses and electrical wiring.
  4.  



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Fig. The Heated Oxygen sensor electrical connector and terminal positions



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Fig. The ECM harness Heated Oxygen sensor electrical connector and terminal positions

 
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