P0138

Tests 270 - 273:

Tests 274 - 275:

SYMPTOM
P-0138 1/2 O2S SHORTED TO VOLTAGE

WHEN MONITORED
With the engine running for more than 2 minutes and coolant temperature above 170 degrees F.

SET CONDITION
The oxygen sensor voltage is above 1.2 volts.

POSSIBLE CAUSES
- 1/2 O2 sensor signal circuit shorted to voltage
- 1/2 O2 sensor wiring harness observable def
- 1/2 O2 sensor wiring harness or connector intermittent def
- 1/2 O2 sensor connector terminals observable def
- 1/2 O2 sensor defective