P0103 — Mass Air Flow Sensor Circuit High Input
Drive with caution — fix soon.
What P0103 means
P0103 means the engine computer is reading a higher-than-expected voltage signal from the Mass Air Flow (MAF) sensor, which measures how much air is entering the engine. This can be caused by a dirty or failing sensor, a wiring problem, or unmetered air leaks that confuse the readings. When the MAF signal is wrong, the computer miscalculates the fuel mixture, leading to drivability problems and higher emissions.
Common symptoms
- Check Engine light is on
- Hesitation or stumbling on acceleration
- Rough idle or stalling
- Noticeable loss of power
- Poor fuel economy
Common causes
- Dirty or contaminated mass air flow sensor
- Failed MAF sensor
- Short to voltage in the sensor wiring
- Loose or damaged sensor connector
- Air intake leak after the MAF sensor
Typical repair cost
$120 – $380
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0103 code?
For short trips, usually yes, but you shouldn't rely on it. Hesitation or stalling from a bad MAF reading can be unsafe in traffic, so it's best to get it diagnosed quickly and avoid long drives until then.
How much does it cost to fix a P0103?
Repairs typically run from $120 to $380. Sometimes cleaning the sensor solves it cheaply, but a full MAF sensor replacement on certain vehicles can be pricier.
Is a P0103 code serious?
It's a moderate concern that can affect how the car drives. It won't usually cause immediate damage, but the drivability issues and poor fuel economy make it worth fixing soon.
Can a dirty air filter cause a P0103?
Indirectly, yes. A clogged filter or contamination can leave residue on the MAF sensor and throw off its readings, so cleaning the sensor and replacing the air filter is often part of the fix.