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VAG 16515O2 sensor circuit low voltage (bank 1 sensor 1)
16515 is the VW Group 5-digit number VCDS (and older VAG-COM versions) shows for P0131. P0131 means “O2 sensor circuit low voltage (bank 1 sensor 1)”. 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
- SystemExhaust sensors
- TypeGeneric (same on all makes)
- VCDS number16515
How urgent is it?
Worth fixing soon; usually drivable meanwhile, but watch for symptoms.
Which system and module
Scanline files it under Exhaust sensors. The first letter, P, means powertrain (engine, transmission, emissions).
Usually stored by the engine control unit (VCDS address 01, Engine).
What usually causes it
- Oxygen sensor upstream (before the catalyst)
- wiring
- exhaust leak
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.