I know this has been discussed many times and is not new but after talking with a Management representative at AOA this week, I thought I'd provide an update and perhaps consolidate the many previous discussions with his confirmations.
There are two Audi recognized vibration issues with 2009 B8 A4s (U.S.) and neither is software or tire related (unless, of course, there is actually a wheel out of balance or damaged). One is the low speed "shuddering" that occurs on certain surfaces at very low speeds. The second is the 65-70 mph high speed vibration noticed in the steering wheel that many have experienced to varying degrees and mileages. In my case, the first has been observable from about 5000 miles and the second has become progressively more noticeable and is now reproducible at all times at 65-70 mph.
This week, the AOA corporate rep informed me that Audi factory engineers have been working on the problem and they are focused on the design of a steering system hose. He told me they will eventually have a TSB fix for this once they are certain they have fully tested it and are certain they have solved the problem. He said it could be 1-2 months before a TSB would be issued.
The high speed vibration is also an Audi recognized issue and they now have a TSB out that addresses this. After the dealer has force balanced the wheels and if the problem persists, they are to contact AOA for approval to change out the lower control arms. Apparently, Audi has changed the control arms with stiffer bushings <nobr style="font-weight: normal; font-size: 100%; color: darkgreen;" id="itxt_nobr_3_0"></nobr>
in the new arms to alleviate this issue. (He confirmed The 2010 A4s have deployed these new control arms at the build). The only drawback is they are back-ordered on the new arms due to the demand and I was told it could take a few weeks for the dealer to obtain them for your car.
All will be covered under warranty.
I too, have experienced both of these issues and after speaking to the AOA Management rep this week, I'm hoping to have these resolved at my next service (assuming the low speed shudder issue has finally been resolved and they can get the arms in stock).
He said that all Audi service centers should have this information. If you get any pushback from the dealer, contact Audi of America directly.