What Are Key Programmers? Most modern cars come with ignition and key systems which require a reprogramming at some time. Key programmers are useful in this situation. There are three scenarios in which a shop might require key programming capabilities. The shop might need to program keys in three scenarios: https://g28carkeys42733.p2blogs.com/28780351/the-history-of-car-key-reprogramming-in-10-milestones