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Symptom List: P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0031-O2 SENSOR 1/1 HEATER When Monitored and Set Condition: P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW When Monitored: Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is on. Set Condition: Desired state does not match Actual state. P0037-O2 SENSOR 1/2 HEATER CIRCUIT LOW When Monitored: Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is on. Set Condition: Desired state does not match Actual state. POSSIBLE CAUSES O2 SENSOR HEATER OPERATION O2 HEATER ELEMENT O2 HEATER CONTROL CIRCUIT O2 HEATER CONTROL SHORTED TO GROUND PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? All Yes → Go To 3 No → Go To 2 227 DRIVEABILITY - NGC |