Steering became very difficult and fault on dash for “power assist failure attention needed”. Also had a warning for the AWS saying there was a failure and attention needed. Luckily happened at low speed in parking lot but became almost impossible to steer. Had towed to nearest Ford dealer where repairs were performed. Safety recall for 2011-2013 MKS but not 2015. Sounds like the same problem. Ford needs to do something about this as it is very dangerous. They should also cover the expense for their faulty part!