What are the possible causes of a rough engine idle on the Audi A1?

I've been experiencing a rough idle on my Audi A1 lately. It's been quite noticeable and I'm concerned about the health of my engine. What could be causing this and how can I fix it?

One possible cause could be a dirty or clogged fuel injector. This can cause the engine to idle roughly and may even trigger the check engine light. Have a mechanic clean or replace the fuel injector if necessary.

Another common cause of rough idle is a faulty oxygen sensor. This sensor helps regulate the air-fuel mixture in the engine and a malfunction can affect engine performance. Have a professional check and replace the sensor if needed.