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Symptom List: P0131-1/1 O2 SENSOR SHORTED TO GROUND Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0131-1/1 O2 SENSOR SHORTED When Monitored and Set Condition: P0131-1/1 O2 SENSOR SHORTED TO GROUND When Monitored: At engine shutdown O2 Heater Diagnostics test. Then at subsequent cold start. Cold start is defined as engine coolant below 37°C (100°F), ambient/battery Set Condition: The oxygen sensor signal voltage is below 0.078 volts for 5 seconds after starting engine. P0137-1/2 O2 SENSOR SHORTED TO GROUND When Monitored: Engine running for 119 seconds. Coolant temperature above 80°C (176°F). Vehicle speed greater than 40 mph. Two trip fault. Set Condition: The oxygen sensor signal voltage is below 0.078 volts for 61 seconds after starting engine. POSSIBLE CAUSES O2 SENSOR BELOW 0.08 VOLTS O2 SENSOR OPERATION O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND O2 SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT O2 SENSOR SIGNAL SHORTED TO HEATER CONTROL/GROUND CIRCUIT PCM TEST ACTION APPLICABILITY 1 Start the engine. t, read the O2 Sensor voltage. Is the voltage below 0.08? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 63 DRIVEABILITY - SBEC |