What usually causes P0101?

Dirty or failing MAF sensor, intake leak after the sensor, clogged air filter.

P0101Mass air flow sensor range/performance

P0101 means “Mass air flow sensor range/performance”. It's a generic powertrain code (fuel and air metering), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.

Fix soon
SystemAir metering
TypeGeneric (same on all makes)
VCDS number16485

How urgent is it?

Worth fixing soon; usually drivable meanwhile, but watch for symptoms.

Which system and module

Scanline files it under Air metering. The first letter, P, means powertrain (engine, transmission, emissions).

Usually stored by the engine control unit (VCDS address 01, Engine).

What usually causes it

Dirty or failing MAF sensor
intake leak after the sensor
clogged air filter

Typical causes are a starting point, not a diagnosis of your car.

What a shop would usually check first

The sensor and its wiring; implausible signals often come from a connector or a damaged sensor.

Related codes

Got this code on your car?

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Scanline explains fault codes; it isn't a repair authority. This page explains what the code means; it can't tell you what is wrong with your car. Ross-Tech's wiki has their own notes on VW Group faults.