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Why is the Audi A4 engine making a loud rattling noise?

I recently noticed that my Audi A4 engine is making a loud rattling noise when I start it up in the morning. It goes away after a few minutes of driving, but it's still concerning. What could be causing this and how can I fix it?

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The most likely cause of the rattling noise is a loose or worn out timing chain. This can be fixed by replacing the timing chain or tensioner.

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