P0137 1/2 O2 Sensor Volts Shorted to Ground

SYMPTOM
P-0137 1/2 O2S VOLTS 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
- Harness or wiring intermittent short to ground
- PCM conn term damgd, corrd, pshd out, or msw
- Sensor conn term corrd, dmgd, pshd out or msw
- 1/2 O2 sensor def
- Signal circuit intermittent short to ground
- Signal circuit shorted from PCM to ground
- PCM def