P0138 – O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- System
- Emissions
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Description
- O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- Detection / symptoms
- 1.Check engine light on 2.Fuel pressure can over rich the system
- Possible causes
- 1.Faulty O2 sensor 2.Short to battery voltage in O2 sensor signal circuit 3.High fuel pressure (not as likely)
- What to check
- 1.Read the code and live data with an OBD-II scanner 2.Look for exhaust or vacuum leaks and check the wiring of the sensor or valve 3.Test the part before replacing it 4.Fix the cause, clear the code and test-drive
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights