P0131

Tests 1 - 2:

Tests 3 - 5:

SYMPTOM
P0131 - 1/1 O2 SENSOR VOLTAGE SHORTED TO GROUND

WHEN MONITORED
With engine coolant temperature above 170 °F on the previous key ON, after a cold start, engine coolant temperature below 98 °F, and ambient/battery temperature sensor reading within 27 °F of engine coolant temperature.

SET CONDITION
The oxygen sensor signal voltage is below 0.156 volts for 28 seconds after starting engine.

POSSIBLE CAUSES
- 1/1 O2 sensor defective
- 1/1 O2 sensor signal circuit shorted to ground circuit
- 1/1 O2 sensor signal circuit shorted to ground
- PCM defective