When I first bought my Focus, it had a problem with wandering on the highway. When I would be going around a curve, seemed I had to fight the steering wheel to keep it going in the direction I want. Seemed to me that what was happening was that the steering wheel was trying to "return to center" too aggressively. Here's a post I made a while ago. See if what I described is what you are experiencing.I just purchased a 2014 Focus and there is a noticeable steering problem.... I am so disappointed! The car pulls left, then right and when I drive I am in constant correction mode. This is especially noticeable when on the highway but I can definitely feel it at slower speeds as well. I saw a news show with the Chairman of Ford saying that Ford is a great product... I guess I got duped. If I could return the car I would. Back to Honda and Hyundai for me.[bigcry][bigcry]
They didn't replace my steering rack, just some bolts and such. Haven't had a problem since. Coming up on 42k now on my Focus.