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Troubleshooting: Why is my Audi A4 making a rattling noise while idling?

I recently noticed that my Audi A4 is making a strange rattling noise when it is idling. It seems to be coming from the engine area. What could be causing this and how can I fix it?

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There are a few potential reasons for this rattling noise. First, check your engine oil level and make sure it is sufficient. Low oil levels can cause engine components to rub against each other and create a rattling noise. If your oil level is fine, it could be a loose or worn serpentine belt or a faulty pulley. It's best to take your car to a mechanic to diagnose and fix the issue.

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