P0137

Tests 1 - 2:

Tests 3 - 7:

Test 8:

SYMPTOM
P0137 1/2 O2S 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 volts for 28 seconds after starting engine.

POSSIBLE CAUSES
- Harness or wiring intermittent short to ground
- PCM connector
- O2 sensor connector
- 1/2 O2 sensor
- O2 sensor signal circuit intermittent short to ground
- O2 sensor signal circuit shorted to ground
- PCM