What usually causes P2187?

Vacuum leak, crankcase breather (PCV), MAF.

P2187System too lean at idle (bank 1)

P2187 means “System too lean at idle (bank 1)”. It's a generic powertrain code (fuel, air metering and emission controls), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.

Fix soon
SystemFuel mixture
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 Fuel mixture. The first letter, P, means powertrain (engine, transmission, emissions).

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

What usually causes it

Vacuum leak
crankcase breather (PCV)
MAF

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

What a shop would usually check first

For air leaks after the air-flow sensor (vacuum and breather hoses, intake gaskets) and fuel pressure.

Related codes

Got this code on your car?

Paste your whole scan into Scanline to see which faults are current and which are old news. It runs in your browser; nothing is uploaded.

Open Scanline

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.