Abstract: In a vehicle on-board reporting system for state emissions tests, the vehicle is provided with a removable media storage device 40 and a radio responder device 42 mounted in the vehicle for transmitting data to and from a remote location. A user interface 32 is mounted in the vehicle and connected to a control module 20 which includes a vehicle identification number 29, diagnostic facilities 22 for receiving data from emission related sensing devices on the vehicle and for determining a malfunction from the received data, an erasable/recordable non-volatile memory 26 for storing diagnostic trouble codes and facilities 30 responsive to a user request for reading the vehicle identification number and the stored diagnostic trouble codes and transmitting the vehicle identification number and emissions information to an output of the control module.