P0151

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
P0151 - 2/1 O2 SENSOR SHORTED TO GROUND

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

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

POSSIBLE CAUSES
- 2/1 O2 sensor connector terminals
- 2/1 O2 sensor
- 2/1 O2 sensor wiring harness
- PCM connector terminals
- 2/1 O2 sensor intermittent short to ground
- 2/1 O2 sensor signal circuit shorted to ground
- PCM (2/1 O2 sensor shorted to ground)