POWER STEERING NOT WORKING. TOOK THE VEHICLE TO A MECHANIC WHO REPLACED THE RIGHT FRONT KNEE AND ELECTRIC POWER STEERING RACK AND RESET FAULT CODES FOR STEERING ANGLE AND ABS. POWER STEERING WORKED FOR APPROXIMATELY 40 MILES. DROVE TO SUPERMARKET. CAME OUT OF MARKET TO FIND POWER STEERING NOT WORKING (STATIONARY). TOOK DIRECTLY TO FORD DEALER. FORD DEALER UPDATED SOFTWARE, PERFORMED STEERING ANGLE RESET, AND CLEARED ALL CODES AFTER REPROGRAMMING. POWER STEERING WORKED FOR APPROXIMATELY 50 MILES. LEAVING WORK I FOUND THE POWER STEERING NOT WORKING AGAIN (STATIONARY). *TR