P0137

Tests 178 - 182:

SYMPTOM
P-0137 O2 SENSOR 1/2 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 within 27 degrees F of engine coolant.

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

POSSIBLE CAUSES
- O2 sensor 1/2 defective
- O2 sensor 1/2 signal circuit short to ground
- O2 sensor 1/2 signal ckt short to ground circuit
- PCM defective