In a method and apparatus for testing vehicle emissions and engine control components using a self-service on-board diagnostics (OBD) kiosk, a stand-alone kiosk includes a computing device capable of gathering VIN information and OBD information from a vehicle using a VIN reader and OBD reader. The kiosk generates a readable display or printed report for the kiosk operator indicating any detected diagnostic trouble codes found during the OBD test. By networking a plurality of kiosks together in a secure network and accessible to the Internet, an OBD kiosk network maintains a centrally located vehicle interface database for storing and retrieving pertinent vehicle-related information during OBD testing.