P0103: Mass airflow sensor circuit signal too high
Drive carefully. Get it checked within a week or two.
Can I drive with P0103?
Yes, but drive carefully and get it checked soon. The computer receives an implausibly high airflow reading, causing lean hesitation or sudden stalling.
What does P0103 mean?
P0103 stands for Mass or Volume Air Flow Circuit High Input.
Symptoms you may notice
- Engine hesitates or jerks when stepping on the gas
- Rough, unsteady idle at stoplights
- Reduced engine power and delayed gear shifts
How much does it cost to fix?
Repair costs for code P0103 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Short to power in MAF sensor wiring
- Internal short inside the MAF sensor
- Corroded ground wire connection
- ECU ground pin oxidation
What to do next
- Inspect the wiring harness for chafing against metal brackets.
- Check ground continuity on the sensor connector pins.
- Test sensor signal voltage with a scan tool or digital voltmeter.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
A P0103 code registers when MAF sensor voltage stays near 5 volts continuously. The engine computer assumes maximum air volume is rushing in, commanding massive fuel injections that can produce black smoke and rough running. Check the harness first, as rodent damage or rubbing against the serpentine belt is a frequent culprit.