Just thought it would be good to have a thread on those annoying noises we've all had once or twice in our Audi-owning life time, and the pure joy of trying to chase it down (if you were lucky enough to resolve).

Issue
Driver Side Rattle Noise - Can be heard going over mildly uneven/rough road at about 20 mph. Really pronounced in any garage, lol. Couldn't hear it at normal street/highway speed.

Resolution
1st visit - inspected suspension bits. Found EC rear end links (with no dust boots) may be rusted out, causing loose play and rattle. Recommended swapping back to oem. Didn't have part with me. Had to come back.

2nd visit - swapped rear oem. Noise still there. Tech recommended bringing back to take stuff off one by one to id the noise.

Between visits - I was able to isolate and replicate the noise at any time by pushing up and down the driver side hood area directly above the wheel well. Couldn't make the same sound on any other side.

3rd visit - Tech removed front sway bar and zip tied front end links to secure in place. Road test seemed to support the front end links. It was beginning to snow hard that day, so it really was not the best of tests. Tried to find a garage during the test along the way, and couldn't (ha). Drove home (with zip ties in place) to get the oem front links. Swapped out. Noise gone.