P0138

Test 1 - 4:

Test 5 - 6:

SYMPTOM
P0138-O2 SENSOR 1/2 VOLTAGE HIGH

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

WHEN MONITORED
The engine running for 119 seconds. O2 Sensor Heater Temperature is greater than 350° C (662° F). Battery voltage greater than 10.99 volts.

SET CONDITION
The Oxygen Sensor voltage is above 3.99O2 volts for 30 seconds. Two trip fault.

POSSIBLE CAUSES
- O2 sensor voltage above 3.7 volts
- O2 sensor signal circuit shorted to voltage
- O2 sensor return circuit shorted to voltage
- O2 sensor
- O2 sensor signal circuit open
- O2 sensor return circuit open
- PCM