If the Check Engine Light comes on on your car, then you know something is wrong. An OBD2 car scanner tool can help you to diagnose the problem and figure out what to do about it. Most tools can even shut the light off if there are no serious problems. The best OBD2 scan tools will read all nine diagnostic scan tools readings put out by your cars system. There is even an Car Code Readers which you can use to connect to your iPhone to diagnose your cars problems on the go. Your car is important to you, so get the right tools to keep it running.