P0131

Tests 1 - 4:

Tests 5 - 7:

SYMPTOM
P0131-1/1 O2 SENSOR SHORTED TO GROUND

WHEN MONITORED
At a cold start, engine coolant below 98 °F, Ambient/Battery 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 of a volt for 28 seconds after starting engine.

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 heater ground circuit
- PCM