What Are Key Programmers? Modern vehicles have key/ignition systems that need to be reprogrammed at some time. This is the reason key programmers can be useful. There are three scenarios where shops may need to have key programming capabilities. The shop may have to program keys in three different situations: https://g28carkeys39791.isblog.net/car-key-reprogramming-101-it-s-the-complete-guide-for-beginners-46631009