Originally Posted by Dragoneye
See, and forgive the laymen's terms, I know it's not called the "change code". BUT...the computer detects tampering. Be it tuning, or return to stock. It's sort of like that little white square on your cell phones that detect water penetration. The phone might dry, but that square will be purple forever....
Gotcha. I guess I'll just be purchasing a handheld for data logging, codes, etc.