WHILE DRIVING APPROX. 30-35 MPH TRIED TO ROUND A BEND IN THE ROAD AND THE STEERING FAILED, THE STEERING WHEEL LOCKED AND I WAS UNABLE TO TURN THE VEHICLE AND CROSSED THE CENTER LANE OF THE ROAD AND CRASHED HEAD-ON INTO A SCHOOL BUS. THE VEHICLES WERE TOWED FROM THE SCENE AND MY VEHICLE WAS LATER INSPECTED BY AN ENGINEERING FIRM TO DETERMINE THE CAUSE OF FAILURE WHICH WAS TIE-ROD DEFECT/PITARM FAILURE. THE REPORT INDICATED THAT THIS AREA DOES NOT HAVE GREASE FITTINGS. THE FAILURE OF THE PART WAS DUE TO IMPROPER MANUFACTURING. *TR