Why does my Audi A4 engine make a ticking noise when idling?

I recently noticed a strange ticking noise coming from my Audi A4's engine when idling. What could be causing this issue and should I be concerned?

The most common cause of a ticking noise in idling engines is a lack of oil or dirty oil. Make sure to check your oil level and change it regularly.

Another possible cause could be a loose or worn out belt in the engine. Check for any visible wear and tear and tighten or replace the belt if necessary.