P0131

Tests 167 - 172:

SYMPTOM
P0131 - 1/1 O2 SENSOR SHORTED TO GROUND

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

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

POSSIBLE CAUSES
- O2S signal circuit short to ground
- O2S signal circuit short to sensor ground circuit
- Wiring harness intermittent defect
- O2 sensor defective
- PCM defective