P0131

Tests 139 - 143:

Tests 144 - 146:

SYMPTOM
P-0131 1/1 O2S VOLTAGE 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 with 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 1/1 con term cor, damage, push out miswire
- O2 sen 1/1 harness or wiring inter short to ground
- PCM conn term corr, push out, damaged, or miswired
- O2 sensor 1/1 def
- O2 sen 1/1 signal ckt intermittent short to ground
- O2 sen 1/1 signal ckt shorted from PCM to ground
- PCM def (O2S sht to gnd)