Why does my Audi A2's engine rev up when I start the car?

Every time I start my Audi A2, the engine revs up to about 3,000 rpm. What could be causing this and is it something I need to worry about?

This is a common issue and is usually due to a dirty or faulty idle air control valve. It's a relatively simple fix and nothing to worry about.

It could also be caused by a vacuum leak in the intake system. Have a mechanic check for any leaks and fix them if necessary.