P0131

Test 1 - 5:

Test 6 - 8:

SYMPTOM
P0131-O2 SENSOR 1/1 CIRCUIT LOW VOLTAGE

WHEN MONITORED
Engine running for less than 30 seconds and the O2 Sensor Heater Temperature is less than 251 °C (484 °F) with battery voltage greater 10.99 volts.

SET CONDITION
The oxygen sensor signal voltage is below 2.5196 volts for 3 seconds after starting engine. One Trip Fault.

POSSIBLE CAUSES
- O2 sensor below 2.52 volts
- O2 sensor
- O2 return circuit shorted to ground
- O2 signal circuit shorted to ground
- O2 signal circuit shorted to sensor return circuit
- O2 signal shorted to the heater ground circuit
- PCM