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Symptom List: P0131-O2 SENSOR 1/1 VOLTAGE LOW Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0131-O2 SENSOR 1/1 VOLTAGE When Monitored and Set Condition: P0131-O2 SENSOR 1/1 VOLTAGE LOW When Monitored: Engine Running. Set Condition: The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two trip Fault. P0137-O2 SENSOR 1/2 VOLTAGE LOW When Monitored: Engine Running. Set Condition: The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two trip Fault. POSSIBLE CAUSES O2 SENSOR BELOW 1.5 VOLTS O2 SENSOR O2 RETURN CIRCUIT SHORTED TO GROUND O2 SIGNAL CIRCUIT SHORTED TO GROUND O2 SIGNAL CIRCUIT SHORTED TO O2 RETURN CIRCUIT O2 SIGNAL SHORTED TO HEATER GROUND CIRCUIT PCM RETURN CIRCUIT PCM SIGNAL CIRCUIT 89 DRIVEABILITY - NGC |