The Quick Answer above is the generic definition. What follows is what is documented for the BMW models that log P0103, checked against manufacturer data and owner reports.
DTC/P0103·BMW
P0103 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)BMW
P0103 on a BMW means the mass air flow sensor is reporting a voltage or frequency above the expected maximum. The ECU thinks too much air is entering the engine and adds extra fuel, causing a rich condition. Common causes are an internally failing MAF sensor, a wiring short to power, or a sensor mounted backwards after recent service.
Repair cost on BMW€8 - €330
Connect any standard Bluetooth OBD2 adapter to your BMW and Skanyx tells you what P0103 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
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BMW 3 Series
2006–2024BMW N52, N54, and N55 MAF sensors can fail high (P0103) after roughly 120,000 km, often presenting alongside rich-running fuel trim codes. The Bosch hot-film element degrades and outputs an inflated reading. INPA or Carly shows live g/s values for verification. Aftermarket cone intakes are a notorious cause of high MAF readings on these cars because they disrupt the laminar flow profile the OEM calibration expects.
What causes P0103 on a BMW?
Beyond the generic causes listed on the main P0103 page, these are the documented BMW-specific patterns:
BMW 3 SeriesN52/N54/N55 hot-film MAF degradation outputting inflated readings
BMW 3 SeriesAftermarket cone intakes disrupting MAF airflow profile
How to diagnose P0103 on a BMW with OBD2
Follow these steps to pinpoint the root cause of P0103:
- Read live MAF values at idle. A 4-cylinder above 10 g/s at idle is abnormally high. A V6 above 20 g/s at idle is high
- Verify the MAF sensor is installed in the correct orientation (arrow points toward the engine)
- Confirm no aftermarket air intake or filter is disrupting laminar airflow at the MAF housing
- Inspect the signal wire for damage or shorts to a 5V or 12V circuit
- If readings stay high with correct orientation and intact wiring, replace the MAF sensor and clear codes
How much does P0103 cost to fix on a BMW? (EUR)
Estimated repair costs for P0103 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0103 on BMW
These codes commonly cluster with P0103 on BMW vehicles:
Looking for the full P0103 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0103 guideSkanyx · BMW
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