This one could be a battery issue. Said you had it parked for two weeks. If MikeR's fix doesn't work then I'd check your battery and /or tire pressures. That has been a factor as well. The lock to lock turn of the sterring wheel fix may take a few minutes to reset things. Mine took a bit when I did it. If none of these things fixes it and your battery is good then it could be something called a Steering Angle Sensor. I had the same issue in our Mercedes and after a few trips back, that was replaced and no issue in the past two years.
Pat