Hi.
I recently bought an A2 (02) 1.6FSI Sport and after a week of driving it I also heard a knocking sound. I called the dealer where I bought it and they suggested I take it to the closest Audi dealer. When I told them about the sound they immediately told me that it sounded like the anti-role had gone and needed to be replaced. They told me this was not rare among A2's. Fortunately I had 2 months of the warrantly left. They told me that the bushings would require replacing as well as the role bar! The dealer where I bought it from called the car in and only replaced the bushings. This apparently was all that was required! Not sure if that's really the case! They did tell me the bushings had to be geniune parts otherwise non-authentic parts could fail. I wonder why the Audi parts failed in the first place! Anyways, the knocking has stopped although due to the low profiles the suspension is fairly nosiy. I have got to used to it now. I didn't find out the cost so unfortunately I can't be of any help in that area. Hope you work it out.
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