That's just a look up table sheet. This is how MS access works. I have another link that might shed light on a very BASIC programming structure that is not encrypted. At the bottom of this page you will see a file named database. download it and open it if you can find away. http://www.theblattners.com/projects...r/Default.html it is in Access and before I had Access I could view the content, but I am old and can not remember how I did it way back then. DHP's PowerTuner is similar if I remember correctly. Now put all of this together and think about why EFILive uses a code for every parameter and why the code is the same for every alike parameter.