How do I troubleshoot a check engine light on my Audi A2?

I recently noticed that my check engine light has come on in my Audi A2. What could be the possible causes for this and how can I go about fixing it? I want to be able to avoid any potential costly repairs, so any advice would be greatly appreciated.

Julie, the first step in troubleshooting a check engine light is to check for any error codes using a scan tool. This will give you a better understanding of the issue and allow you to make an informed decision on how to proceed.