The number one complaint vehicle owners have is bringing their car or truck to a repair shop with the fear of being taken advantage of. CodeKey is the solution to this fear. CodeKey is a sophisticated but simple, easy to use device designed to unlock the mystery of why your vehicles "Check Engine" light is illuminated. With CodeKey, you can be your own "vehicle doctor" and diagnose what is wrong with it. You may not always be able to fix it yourself, but you will know what part or system of your vehicle is not working properly, allowing you to make a more educated decision on who should repair it- potentially saving money by being more informed. CodeKey is designed to work on all '96 and newer model vehicles.