Ford P0503 OBD-II Trouble Code Definition: P0503 Vehicle Speed Sensor A Intermittent/Erratic/High P0503 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0503 Vehicle Speed Sensor “A” Intermittent/Erratic/High What does the code mean? OBD-ii Code P0503 definition: The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the […]