THIS IS A MINI DIOGNOSTIC ,JUST PLUG IN TO UNDER DRIVERS SIDE ,AND IT WILL TELL YOU ANY PROBLEMS YOU ARE HAVEING WITH YOUR MINI ,WHY PAY $100 PLUS EVERY TIME A LIGHT GOES ON ,WILL PAY FOR ITSELF AFTER ONE USE ,PLEASE PHONE IF SERIOUS INTREST .COMES WITH C.D INSTRUCTIONS AND BOOK ,PLEASE PHONE FOR FULL ADDRESS,THANKS