What goes bad on control arm?
Is a bad control arm a safety issue?
They can be had cheap on ebay, about $100 each for both the lower curved and straight one. Just replace the whole arm, they are the same for the A4, A6, A8 and Passat.
<img src="http://pictureposter.audiworld.com/24433/new_parts_installed_right_side.jpg">
<img src="http://pictureposter.audiworld.com/24433/old_parts_removed.jpg">








