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Why does my Audi A2 engine make a strange noise when idling?

I recently noticed that my Audi A2's engine makes a strange noise when idling. It almost sounds like a rattling noise. I'm worried it could be a sign of a larger issue. Has anyone else experienced this problem, and how did you fix it?

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It's possible that the noise is coming from the engine's belt tensioner. This is a common issue on older Audi A2s. You may want to have a mechanic check it and see if it needs to be replaced.

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