My upstream o2 sensor has no power I have a fault p0031 and p0037

Asked by GuruCMMJH Mar 10, 2019 at 07:29 PM about the 2004 Chrysler PT Cruiser

Question type: Maintenance & Repair

Have not checked down stream sensor

4 Answers
2,570

Sirkut_Interrupted answered 5 years ago

Not true ^^ chrysler uses a 5 volt bias to their o2 sensors and as they heat up this 5 volts gets pulled down to your typically o2 voltage ranges.. this can be a great diagnostic aid in looking for o2 heater functionality

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Sirkut_Interrupted answered 5 years ago

These o2 sensors are ground side switched by the pcm and its expecting to see 12 volts but the computer is seeing low volts on both upstream heater circuits, id check for a blown o2 heater fuse

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