Lost all assist to the steering a while back. No clunking just intermittent lost of assist on start up. You could turn it off and restart and the assist would be normal. Finally lost all assist. Decided to bite the bullet and replace the column. I had to wait about three weeks for the part to be available in the USA. $1100 to my door. Replacement was pretty straight forward but there were some strange things that happened. There was assist all the time, key on, key off, key out. Now it is normal sometimes with no assist until the engine starts and sometimes all the time. I tried a work around to recalibrate the steering angle sensor but finally had to take it to a repair shop. And the steering lock is now at 90 degrees right.