Why does my Audi 80's engine make a ticking noise at idle?

I have noticed that my Audi 80's engine makes a ticking noise when the car is at idle. It seems to go away once I start driving. What could be causing this and is it something I should be concerned about?

The ticking noise at idle is most likely caused by a faulty lifter or valve. This can be a common issue in older Audi 80s and should be addressed by a mechanic as soon as possible to avoid further damage to the engine.

If the ticking noise only occurs when the engine is cold, it could be due to a lack of lubrication in the valve train. Make sure you regularly change your oil according to the manufacturer's recommendations to prevent this issue.

Another possible cause of the ticking noise could be a loose or worn belt in the engine. Check the condition of all belts and replace any that appear damaged or worn.