SOURCE: I have a nisssan sentra
this obd2 trouble code table can help you understand the menaing of code, and for p0031, try: check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement). check the ground circuit for continuity. measure the resistance of the heater circuit (done on the sensor itself). measure the resistance and voltage of the wiring.
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