What usually causes P0404?

EGR valve sticking, position sensor.

P0404EGR control circuit range/performance

P0404 means “EGR control circuit range/performance”. 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)
VCDS number16788

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

EGR valve sticking
position sensor

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.