What causes the Audi A2 to have a high idling speed in cold weather?

I recently purchased an Audi A2 and noticed that the idle speed is extremely high when driving in cold weather. What could be causing this issue and how can I fix it?

One possible cause could be a faulty idle control valve. This valve regulates the amount of air entering the engine when the throttle is closed. In cold weather, the valve may get stuck in the open position, causing a high idle speed. You may need to replace the valve to fix this issue.