P0151

Tests 321 - 326:

Tests 327 - 328:

SYMPTOM
P-0151 2/1 O2S SHORTED TO GROUND

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

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

POSSIBLE CAUSES
- O2 sen 2/1 conn term corrode, damage, P/O, miswire
- O2 sensor 2/1 def
- O2 sensor 2/1 wiring harness intermittent def
- PCM conn term corrode, damage, push out, miswired
- O2 sensor 2/1 intermittent shorted to ground
- O2 sensor 2/1 signal circuit shorted to ground
- PCM def (2/1 O2 sensor)