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VAG 16519O2 sensor heater circuit (bank 1 sensor 1)
16519 is the VW Group 5-digit number VCDS (and older VAG-COM versions) shows for P0135. P0135 means “O2 sensor heater circuit (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.
- Not urgent
- SystemExhaust sensors
- TypeGeneric (same on all makes)
- VCDS number16519
How urgent is it?
Usually not urgent; often emissions-related.
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 heater
- fuse
- 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.