Abstract: A method and apparatus are disclosed for facilitating the diagnosis and servicing of automotive vehicles wherein a communicating network computer interfaces between a plurality of service agencies and a vehicle data base plus a record storage system. The service agencies have diagnostic test equipment that are provided with unique vehicle specifications and diagnostic information from the vehicle data base through the network computer. Measured diagnostic data from the diagnostic test equipment is supplied to the record storage system through the network computer as well as to display and printing equipment at the service agency. The data stored and displayed and the unique vehicle specifications are sorted by the unique identification of the vehicle. The apparatus permits data base access for improvements and changes to the data base. The storage permits retrieval of data by vehicle, type of service, and summary records to provide improved service agency operation.