A system, method, and apparatus for retrieving trouble codes from an equipment under diagnosis and retrieving only relevant diagnostic information relative to the returned codes from one or more remote diagnostic libraries. An electronic diagnostic library contains diagnostic vehicle information tagged with trouble code identification ID's at a first location, and a diagnostic tool at a second location requests only relevant diagnostic information from the electronic library that is tagged with trouble code identification ID's corresponding to the retrieved trouble codes and information identifying the equipment under diagnosis. The diagnostic tool receives the specific diagnostic vehicle information at the first location and may store the specific vehicle information locally prior to displaying an index to the information to a repair technician.