Trouble codes › P0103
P0103 Mass or Volume Air Flow "A" Circuit High
Fuel and air
P0103 means the mass airflow (MAF) sensor's signal is too high, usually a failed sensor or a wiring fault.
The mass airflow (MAF) sensor signal is higher than the engine could really be drawing, which usually points to a wiring fault or a failed sensor.
Usually drivable, but the engine may run rich, hesitate or stall. Get it checked soon.
Common causes
- A failed MAF sensor
- A short in the signal wire to power
- A poor ground at the sensor
- Electrical interference from aftermarket wiring nearby
Symptoms
- Rough idle or stalling
- Black smoke or poor fuel economy
- Hesitation
What to check first
- Inspect the connector and wiring for damage or corrosion.
- Check the sensor's ground and signal with a meter as your service information describes.
- Look for aftermarket wiring (lights, alarms) routed along the MAF harness.
- Replace the sensor if the wiring is good.
What does P0103 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0103No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0103 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.