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2011
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300 C, 4WD
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Repair and Diagnosis
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Section 950 (5.7L CNG - DTCS P000B To P0202 - 2500 Hd)
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Diagnosis And Testing
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P0031-O2 Sensor 1/1 Heater Circuit Low
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Set Condition
Set Condition
WARNING:
This page is about a different car, the 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The O2 Sensor heater element input is below the minimum acceptable voltage.