How to troubleshoot a check engine light on an Audi?

My check engine light came on while driving my Audi. I'm not sure what could be causing it. What steps can I take to troubleshoot this issue?

First, you should check the gas cap to make sure it is tight. A loose gas cap is a common cause of a check engine light. If that doesn't solve the issue, you can take your car to a trusted mechanic or Audi dealership for a diagnostic test.

Another possible cause of the check engine light is a faulty oxygen sensor. This can affect the performance of your engine and decrease fuel efficiency. It's best to have this issue addressed as soon as possible.