What are the common causes of check engine light in Audi A6?

I recently noticed that my check engine light came on in my Audi A6. I'm not sure what could be causing it, can someone help?

One common cause of the check engine light in Audi A6 is a loose gas cap. Make sure to tighten it properly and see if the light goes off.

Another possible cause could be a faulty oxygen sensor. It's best to have a professional mechanic check it and replace it if necessary.

A dirty air filter or bad spark plugs can also trigger the check engine light. Try cleaning your air filter and replacing your spark plugs to see if that helps.