P0131

Test 1 - Test 5:

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 10.4 volts.

SET CONDITION
The oxygen sensor signal voltage is below 2.411 volts for 10.24 seconds after starting engine. One Trip Fault.

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