I too have brought my 2012 Focus back for the 'steering assist failure'. I have brought it back three times now. The first two times they claimed they had to clear and reset some codes. (????) and then this time around they had to replace a module (on a brand new car???? really????)...if the problem happens again, I will file a Lemon Law claim in NY State against Ford and see if I can get a replacement vehicle.
I dont blame the people at the dealership or Ford for that matter.....I was just unlucky enough to get that one defective car out of a hundred thousand. I love my Focus and do not want to flip brands...