What causes the engine malfunction indicator light to come on in an Audi A2?

I recently noticed that the engine malfunction indicator light has turned on in my Audi A2. What could be causing this and how can I fix it?

The engine malfunction indicator light can turn on due to a variety of reasons such as a faulty oxygen sensor, a loose gas cap, or an issue with the spark plugs. It is recommended to get the car checked by a mechanic to diagnose the exact issue.

One simple solution could be to check the gas cap and make sure it is tightly closed. A loose gas cap can sometimes trigger the engine malfunction indicator light. If the light stays on after tightening the gas cap, then it's best to get the car checked by a professional.