Why is the check engine light of my Audi A4 continuously on?

I noticed that the check engine light of my Audi A4 has been on for a while now. There has been no change in the performance of my car and no unusual noises. What could be causing this and what should I do to fix it?

The check engine light can indicate a variety of issues, from simple things like a loose gas cap to more serious engine problems. It is always a good idea to get it checked by a mechanic as soon as possible to prevent any potential damage. My advice would be to take your car to a certified Audi technician to diagnose and fix the issue.

One common cause of the check engine light on Audis is a faulty oxygen sensor. This can affect your car's fuel economy and emissions, so it's important to get it fixed. If your car is still under warranty, take it to an authorized dealership for a free repair.