did you step on it? if not, try these fixes -
steering wire bent? open steering mechanism and bend it back.
steering magnet came loose? open steering mechanism and glue the magnet back in its "C" shaped holder.
did you adjust the trim? the little white (usually white) tab ont he bottom of the car used the adjust the steering from one side to another. try centering it and see what happens. move it around until the steering is just right.
if you get it fixed you can do mods on it
here's a list of mods.
gl!