The Quick Answer above is the generic definition. What follows is what is documented for the Audi models that log P0102, checked against manufacturer data and owner reports.
DTC/P0102·Audi
P0102 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0102 on a Audi means the mass air flow sensor is reporting a voltage or frequency below the expected idle minimum. The ECU thinks almost no air is entering the engine, so it cuts fuel injection accordingly. The root cause is usually a contaminated MAF element, a major air leak after the sensor, or a wiring fault.
Repair cost on Audi€8 - €350
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Audi A4
2008–2024B8 A4 2.0 TFSI is notorious for MAF failures around 100,000 km. The Bosch hot-film element loses sensitivity from carbon and oil contamination. VCDS shows long-term fuel trims pinned above +20% before the code sets. Always inspect the PCV diaphragm at the same time, since a leaking PCV causes oil contamination that ruins replacement sensors quickly.
What causes P0102 on a Audi?
Beyond the generic causes listed on the main P0102 page, these are the documented Audi-specific patterns:
Audi A4B8 2.0 TFSI MAF sensor failure at 100,000 km from oil contamination
Audi A4PCV diaphragm leak destroys replacement sensors quickly
How to diagnose P0102 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0102:
- Read live data and check MAF reading at idle. A 4-cylinder should show 2–7 g/s. Below 1 g/s is consistent with P0102
- Inspect the air filter and replace if dirty (a clogged filter pushes MAF readings low)
- Inspect the intake tract from the MAF housing to the throttle body or turbo for cracks, loose clamps, or disconnected hoses
- Clean the MAF sensor using a dedicated MAF cleaner spray (never use brake cleaner or carb cleaner)
- If readings remain low after cleaning and the intake is sealed, unplug the MAF and test drive. If the car runs better, replace the sensor
How much does P0102 cost to fix on a Audi? (EUR)
Estimated repair costs for P0102 in EUR, compiled across makes. Expect Audi 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 P0102 on Audi
These codes commonly cluster with P0102 on Audi vehicles:
Looking for the full P0102 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0102 guideSkanyx · Audi
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