Question about 1999 Audi A4

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When I cold start my car there's a fan that kicks in for a couple min. Well it has got louder lately so I looked under the hood and there is a part about the size of a grapefruit at the bottom front part of the engine. It has a fan inside of it that's is making all the noise. Today I took my son to school and it had trouble starting and now wont start at all. I have gas and the battery is turning the car over. What should I do

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That noise is the secondary air pump (an emissions device) and it appears to be failing. If you have emissions checks in your state inspection, when it fails completely you'll end up with two codes and a check engine light and will not pass inspection. I assume you hear this only on cold start, correct? If so, then it's your secondary air pump.

Posted on Jul 02, 2011

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