Question about 1999 Audi A4
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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Posted on Jan 02, 2017
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