A vehicle maintenance system comprising an ECU and a port for interfacing with the ECU, the ECU configured to store diagnostic data related to the vehicle. The system further comprises a dongle configured to interface with the port to send data to the ECU and receive data from the ECU and a local device configured to communicate with the dongle and a remote computer, the local device comprising a display, a memory storing program instructions, and a processor configured to execute the program instructions to establish a communications link with the ECU via the dongle to allow the transfer of diagnostic data from the ECU to the local device, to allow the transfer of the diagnostic data from the local device to the remote computer and to receive data from the remote computer, such that the data received is used to perform a maintenance action on the vehicle.