Viecar app connects with the Viecar OBD to diagnose and monitor the vehicle. Viecar perfectly supports Android devices, supports high-speed data transmission, low power consumption and super power saving. Favorable conditions by connecting the computer interface of the automobile ECU, the 360 ° physical examination of the whole vehicle can be realized, the sub-health status of the vehicle can be detected early, and the vehicle fault can be found as soon as possible within the warranty period, so as to deal with relevant interests in time and protect the interests of the owner; Historical fuel consumption and other multi-dimensional fuel consumption analysis and evaluation, so that car owners can save money; It can also record driving behavior, analyze vehicle condition data, put forward improvement suggestions, timely correct bad driving habits, and make drivers use their cars more humanized.