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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
sounds like wheel bearing to me,may be fuel pump struggling because of plugged fuel filter,and the secondary air injection pump is for smog purposes and all 6's have 'em.
I'm pretty sure its the wheel bearing, I don't think its the fuel pump or the secondary air injection pump. I will just buy some new bearing tomorrow and see what happens.