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VAG 16621Turbocharger/supercharger boost sensor A circuit low
16621 is the VW Group 5-digit number VCDS (and older VAG-COM versions) shows for P0237. P0237 means “Turbocharger/supercharger boost sensor A circuit low”. It's a generic powertrain code (fuel and air metering (injectors, turbo/supercharger)), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.
- Fix soon
- SystemBoost
- TypeGeneric (same on all makes)
- VCDS number16621
How urgent is it?
Worth fixing soon; usually drivable meanwhile, but watch for symptoms.
Which system and module
Scanline files it under Boost. The first letter, P, means powertrain (engine, transmission, emissions).
Usually stored by the engine control unit (VCDS address 01, Engine).
What usually causes it
- Boost pressure sensor
- wiring
Typical causes are a starting point, not a diagnosis of your car.
Related codes
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Open ScanlineScanline 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.