Abstract: This application describes and discloses diagnostic systems, methods, and associated devices for repairing vehicles. A hand-held interface device configured to wirelessly communicate with a wireless OBD device in a vehicle to be repaired with bi-directional control. A network access point and other wireless devices may be used to access vehicle information, repair instruction, diagnostic information, research information, remote expert guidance, remote databases and applications, and other repair and diagnosis information from the interface device, allowing a technician to efficiently and effectively repair a vehicle.