P0103: How to Diagnose & Fix — Mass or Volume Air Flow Circuit High Input
3 vehicles · 3 makes · $100-$900 repair
How to diagnose and fix P0103: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Audi A8 · 1996–1998
On 2.8 V6 A8 models fitted with the AGA and ACK engines, engine misfiring may result in damage to the air grid in the air mass meter which could cause the grid to detach and jam the throttle valve. A jammed throttle can cause sudden loss of power control or a stuck-open throttle, presenting a serious drivability and safety risk. The MAF itself also commonly degrades, causing stalling, hesitation and limp mode with codes such as 16487 / P0103 (G70 signal too high).
Common Symptoms
- stalling
- engine misfire
- hesitation under acceleration
- throttle stuck or unresponsive
- check engine light
- limp mode
How to Fix
This was addressed under Australian recall PRA 1998/3629 (August 1998); affected VINs received an updated MAF/air-grid assembly free of charge through Audi dealers. Out-of-recall vehicles should have the MAF (G70) sensor inspected and replaced if the screen is damaged — a Bosch/Hitachi OE-spec MAF runs roughly $150–$300 plus labor. Always clear adaptation values with VCDS after replacement and address any underlying misfire (coils, plugs) to prevent recurrence.
Sources for this issue (1)
BMW M5 · 2000–2003
The S62 uses dual mass-airflow sensors, and aging or contaminated MAFs are a recurring E39 M5 issue. Owners commonly report rough idle, hesitation, poor throttle response, reduced power, and check-engine lights with mixture adaptation faults. BMW service literature and independent repair databases frequently reference diagnosis of intake leaks versus faulty MAF readings on E39 V8 applications.
Common Symptoms
- Check engine light
- Rough idle
- Hesitation on acceleration
- Reduced engine power
- Poor fuel economy
- Lean mixture faults
How to Fix
Scan for fuel-trim and MAF-related faults, inspect for intake leaks first, then compare live airflow values bank-to-bank. If readings are implausible or one bank differs significantly, replace the affected MAF sensor(s) with OE-quality parts and clear adaptations; also inspect intake boots and air filter condition.
Sources for this issue (1)
Pontiac Bonneville · 1996–2005
The MAF sensor on OBD-II 3800-powered Bonnevilles is a frequent failure point: its hot-wire element becomes contaminated with dirt or oil (often from over-oiled aftermarket filters) or the sensor electronics fail outright, sending a low or erratic frequency signal to the PCM and setting codes P0101/P0102. The result is hesitation, stumbling, rough idle, lack of power, and stalling. A classic 3800 diagnostic trick — the engine running noticeably better with the MAF unplugged — confirms the sensor as the culprit.
Common Symptoms
- Hesitation or stumble on acceleration
- Stalling at idle or when coming to a stop
- Check engine light with P0101/P0102
- Rough idle and lack of power
- Engine runs better with the MAF sensor unplugged
How to Fix
Clean the sensor element with dedicated MAF cleaner as a first step; if symptoms or codes return, replace the MAF sensor, a common and straightforward repair on these cars. Also verify the intake tube is sealed and check the MAF/O2 fuse, which feeds the sensor's 12V supply.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- CRC 05110 Mass Air Flow Sensor Cleaner, 11 oz
Cleaning chemical, not a vehicle-specific sensor. Use only per label and service procedure; replace the sensor only if testing still proves it faulty.
- GM 19112534 remanufactured mass-airflow sensor
1996 Pontiac Bonneville SE/SSE 3.8L as listed; confirm VIN/design and core-return terms.
- GM 19179716 mass-airflow sensor
1997-1998 Pontiac Bonneville SE/SSE 3.8L as listed; confirm VIN and connector.
- GM 19179715 mass-airflow sensor
1999-2005 Pontiac Bonneville 3.8L V6 as listed. Excludes 2004-2005 GXP 4.6L even if a trim label appears in a catalog result.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (5)
- Engine Stalling Due to Mass Air Flow/Crankshaft Position Sensor Failure: Pontiac Bonneville (149 reports)article
- Pontiac Bonneville: Bad Mass Airflow Sensor — Symptoms + P0101/P0102 (Drivetrain Resource)article
- How To Test The MAF Sensor (GM 3.8L V6 1996-2005, incl. Pontiac Bonneville) — P0101/P0102article
- Supercharged 3800 Series II with code P0102 (2001 Bonneville SSEi) — GM Inside News Forumforum
- Driving me CRAZY — P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency — 3800Pro Forumsforum
Find P0103 by make
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P0103 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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 $100 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0103?
Au7o has documented P0103 across 3 vehicle models from 3 manufacturers: Audi, BMW, Pontiac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.