Abstract: A vehicle diagnostic system and related method comprises an interface component connected to a vehicle's On-Board Diagnostics (OBD) port, interface elements comprising: a short range communication module; and a vehicle network protocol interface; short range communication module designed to automatically constitute a data link with a mobile communication device running a gateway module; vehicle network protocol interface configured to intercommunicate bi-directionally with short range communication module to obtain requests from gateway module and to send vehicle data to gateway module: said vehicle network protocol interface further configured to communicate bi-directionally with OBD port to send requests to the vehicle's networks and to derive vehicle data therefrom.