This product scans VAG vehicles for problems, clear any existing fault codes. The app can detect and clear faults of airbags, heaters & air conditioner, abs, engine etc. Even if the check engine doesn't indicates any trouble this app can detect old stored and permanent faults. You MUST have an OBD ELM adapter that plugs into your vehicle's diagnostic OBD2 port in order to use the app. No more paying dealers an hour's rate! Diagnose: Carman checks your vehicle's health and report any faults stored its modules. You can also clear any fault codes and reset your "check engine","airbag" lights. This app developed specially for VAG vehicles Volkswagen, Audi, Seat, Skoda (VAG 2001+ cars) Hardware Requirement: In order to use Carman, you need an OBD adapter - a separate piece of hardware that you plug into the vehicle's diagnostic port. The app is compatible with generic WiFi ELM327 (cheap Chinese dongles also work) adapters (note that Bluetooth adapters are NOT supported).