Don't know if I can help or not. I hear a noise coming from mine (C5 V6 Auto) also when I turn the car off. It's done it everytime since I've had it, so I'm thinking it's normal. I have but only 230 miles on mine since Dec. 5th purchase. I don't think there is any cause for concern but if in doubt, take it to another dealer and see what they say.
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