P0138

Tests 185 - 189:

Tests 190 - 194:

SYMPTOM
P-0138 1/2 O2 SENSOR SHORTED TO VOLTAGE

WHEN MONITORED
With the engine running for more than 4 minutes after coolant temperature reaches 180 degrees F.

SET CONDITION
The oxygen sensor voltage is above 1.5 volts.

POSSIBLE CAUSES
- DTC(HEX) not equal to freeze frame DTC(HEX)
- Good trips not displayed
- Circuit open from O2S connector to PCM connector
- O2 sensor signal short to voltage (engine off)
- O2 sensor signal short to voltage (engine running)
- O2S signal intermittent short to voltage (eng off)
- O2S signal intermittent short to voltage (eng run)
- Powertrain control module defective