What should I do if my Audi A4's check engine light comes on?

I recently noticed that the check engine light in my Audi A4 has come on. What could be the possible causes and how should I address this issue?

The check engine light can come on due to various reasons such as a faulty sensor, oxygen sensor, or a loose gas cap. The best thing to do in this situation is to get your car's diagnostic codes checked with an OBD scanner or take it to a mechanic.

If the check engine light is flashing, it means that there is a serious issue and you should not continue driving the car. Get it checked by a professional as soon as possible.

In some cases, a simple solution like tightening the gas cap can fix the issue. So before going to a mechanic, make sure to check your gas cap.