Ford P0479 OBD-II Trouble Code Definition: P0479 Exhaust Pressure Control Valve Intermittent P0479 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0479 Exhaust Pressure Control Valve Intermittent What does the code mean? OBD-ii Code P0479 definition: Exhaust Back Pressure Regulator – Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase […]