A system for diagnosing and repairing vehicles is provided. An example apparatus includes a vehicle interface configured to transmit one or more instructions to an adaptor connected to a vehicle and retrieve an indication of one or more diagnostic trouble codes from the adaptor. The apparatus includes a communication module configured to transmit the diagnostic trouble codes to a remote server along with a user identifier or a vehicle identification number, and receive repair information from the remote server. The apparatus further includes a user interface configured to receive user requests for information and to display information regarding the adaptor, the vehicle information, the one or more diagnostic trouble codes, and/or the repair information. Finally, the apparatus includes a memory and a processor configured to control the vehicle interface, the communication module, the user interface, and the memory.