Ford P0401 OBD-II Trouble Code Definition: P0401 Exhaust Gas Recirculation Flow Insufficient Detected P0401 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0401 Exhaust Gas Recirculation Flow Insufficient Detected What does the code mean? OBD-ii Code P0401 definition: EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce […]