How to troubleshoot a check engine light in an Audi?

I've noticed that my check engine light has come on in my Audi. How do I troubleshoot this issue and determine the cause? Is it something I should be concerned about?

The check engine light can come on for a variety of reasons, from a loose gas cap to a more serious engine issue. The best thing to do is to use an OBD2 scanner to read the codes and determine the cause. If the code is something simple like a loose gas cap, you can fix it yourself. Otherwise, it's best to take your Audi to a mechanic for further diagnosis and repair.