P0138

Tests 1 - 6:

Test 7:

SYMPTOM
P0138 - 1/2 O2 SENSOR SHORTED TO VOLTAGE

TEST NOTE
This symptom is diagnosed using the test P0132 - 1/1 O2 SENSOR SHORTED TO VOLTAGE.

WHEN MONITORED
With battery voltage greater than 10.4 volts, engine running for more than 4 minutes and engine coolant temperature above 180 °F.

SET CONDITION
The oxygen sensor voltage is above 1.5 volts.

POSSIBLE CAUSES
- O2S sensor ground circuit open
- O2S signal circuit open
- O2S signal circuit short to voltage
- Wiring harness intermittent problem
- O2 sensor
- PCM