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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: With the engine running for at least 2 minutes and in Closed Loop or Fuel Enrichment mode, engine coolant temp greater than 80°C (176°F), battery voltage at Set Condition: The 1/1 Oxygen Sensor Signal circuit voltage is below 0.025 volt for more than 5 seconds. P0137-1/2 O2 SENSOR SHORTED TO GROUND When Monitored: With the engine running for at least 2 minutes, engine coolant temp greater than 80°C (176°F), battery voltage at least 10 volts, engine speed <6000 RPM but Set Condition: The 1/2 Oxygen Sensor Signal circuit voltage is below 0.05 volt for more than 10 seconds. POSSIBLE CAUSES INTERMITTENT CONDITION 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 GROUND CIRCUIT PCM TEST ACTION APPLICABILITY 1 Start the engine. t, read the O2 Sensor voltage. Is the voltage below 0.05? All Yes → Go To 2 No → Go To 7 74 DRIVEABILITY - 1.6L GAS |