At any speed, moving the steering wheel through center presents a "notchy" feel, where resistance is felt and then the wheel jumps to another position. these "notches" are felt through about 10-20 degrees off center. at highway speeds, the car is difficult to keep in a straight line as the steering fights the driver to remain on-center. the dealer, when contacted, replaced the "steering rack", which made the problem go away. i have read a dozen or more reports from other 2013 audi a4/a5/s4/s5/allroad owners reporting the same issue, and at least one reported that the problem returned after a steering rack replacement. my concern is that this is just a temporary fix and that the problem will recur. *tr
There are two issues which occur without warning, usually when the car is cold or while driving on the freeway. the first issue occurs when traveling in a straight line and is a "slip" in the steering wheel when crossing the 12 o'clock position where it feels like it's holding fine and then suddenly "slips" and then grabs again when you turn the wheel off center. this happens with no change in road conditions, acceleration, or vehicle speed. when this occurs it is unsettling and has caused drivers to inadvertently drift into the adjacent lane. the second issue is a "notchy" feel which happens at any speed, any steering mode and any wheel position. like the first steering issue, this also feels unsafe as the driver often over or under corrects steering input. i have taken the vehicle to audi dealers numerous times, they even changed the power steering system in jan 2013 however the problem returned after approximately 45 days. i took the car back to the audi dealership in june at which point they acknowledged that audi is aware of the problem and they are working on a fix, however neither the dealer nor audi has called with a real fix for this issue yet. *tr