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Why does my Audi A6's engine make a rattling noise on startup?

I recently noticed that my Audi A6's engine makes a loud rattling noise when I start it up. What could be the cause of this and how can it be fixed?

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The most common cause of a rattling noise on startup in an Audi A6 is a faulty timing chain tensioner. It is recommended to have this repaired by a certified mechanic as soon as possible to prevent further damage to the engine.

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