P0137

Tests 1 - 3:

Tests 4 - 5:

SYMPTOM
P0137 - 1/2 O2 SENSOR VOLTS 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 sensor reading within 27 °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 shorted to ground
- O2 sensor 1/2 signal circuit shorted to ground circuit
- PCM defective