Power steering assist warning light comes on, warning to get off the road and take to a dealer. each time i have been driving when the light came on. could not drive it had to have the car towed to my mechanic. two weeks later the power assist light has come on. not safe to drive will have it towed to a ford dealership. is is very hard to turn and the (epas) electronic power assist steering needs to be replaced or fix the whole system.