If you're finding that your car's MyKey system is limiting the volume of your audio system, there are a few ways that you can bypass it. One way is to simply disconnect the battery for a minute or two, which will reset the system and allow you to enter a new code. Another way is to use a special tool called the MyKey Relearn Tool, which can be found online or at your local Ford dealership. Once you have this tool, simply follow the instructions to bypass the limited volume setting.