The app needs a Bluetooth OBD2 adapter to work.
Some vehicle ECUs may support more/less features than others Works on vehicles made by Ford, VW, GM/Vauxhall/Opel, Chrysler, Mercedes, Volkswagen, Audi, Jaguar, Citroen, Peugoet, Skoda, Kia, Mazda, Lexus, Subaru, Renault, Mitsubishi, Nissan, Honda, Hyundai, BMW, Toyota, Seat, Dodge, Jeep, Pontiac and many more vehicle makes, European, US, Far East, etc.
Works on any vehicle that uses the OBD 2 standard (most vehicles built after 2000, but can work for vehicles as far back as 1996) if in doubt check with your manufacturer first or look for 'OBD2' on written on a big white label in your engine bay