P0103: Mass or Volume Air Flow Circuit High Input
2 vehicles · 2 makes · $150-$900 repair
Most Reported On
P0103 is an OBD-II diagnostic trouble code meaning “Mass or Volume Air Flow Circuit High Input.” This generic code means the PCM detected a higher-than-expected signal voltage or airflow reading from the mass air flow (MAF) sensor circuit. Because the MAF reading directly affects fuel delivery, an abnormally high signal can cause the engine to run rich or behave erratically, with symptoms like rough running, hesitation, or poor fuel economy. It typically points to a sensor or wiring problem, or unmetered conditions confusing the sensor. This code is most commonly reported on 2000-2003 BMW M5, and 1996-1998 Audi A8 (2.8), with repair costs ranging from $150 to $900.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0103, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does P0103 mean?
P0103 stands for "Mass or Volume Air Flow Circuit High Input." This generic code means the PCM detected a higher-than-expected signal voltage or airflow reading from the mass air flow (MAF) sensor circuit. Because the MAF reading directly affects fuel delivery, an abnormally high signal can cause the engine to run rich or behave erratically, with symptoms like rough running, hesitation, or poor fuel economy. It typically points to a sensor or wiring problem, or unmetered conditions confusing the sensor.
What are the most common causes of P0103?
The most common causes of P0103 are: Faulty or contaminated mass air flow sensor, Short to voltage in the MAF signal wiring, Damaged connector or corroded terminals at the MAF, Intake/vacuum leak affecting the signal, Dirty MAF sensor element, Poor sensor ground, Faulty PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0103?
Repair costs for P0103 range from $150 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0103?
Au7o has documented P0103 across 2 vehicle models from 2 manufacturers: Audi, BMW.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.