How to Fix the Check Engine Light in an Audi?

My Audi's check engine light has been on for a few days now. What could be the issue and how can I fix it?

First, it's important to get the car diagnosed by a professional to determine the specific issue. It could be something as simple as a loose gas cap or a more serious engine problem. Once the issue is identified, it's recommended to get it fixed as soon as possible to avoid any further damage. As for the check engine light, it's important to not ignore it and get it fixed as soon as you can.