As a vehicle diagnosis tool designed for America and Europe car models, US&Euro Car APP obtains vehicle information and data to diagnose cars by connecting the mobile phone with diag connector through Bluetooth. Together with gold EasydDiag+ App, it provides functions of diagnosis, IM, and car cloud platform and connects to Internet to remotely diagnose cars, query maintenance cases, and exchange maintenance info, thus building a maintenance platform with technicians, workshops, and car owners involved.