What usually causes P242F?

DPF at end of life (ash can't be burned off).

P242FDiesel particulate filter restriction: ash accumulation

P242F means “Diesel particulate filter restriction: ash accumulation”. It's a generic powertrain code (auxiliary emission controls), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.

Fix soon
SystemEmissions
TypeGeneric (same on all makes)

How urgent is it?

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

Which system and module

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

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

What usually causes it

DPF at end of life (ash can't be burned off)

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

What a shop would usually check first

The driving pattern (short trips stop regeneration) and the DPF pressure sensor and its hoses.

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.