If your 2009 Ford Fusion is flashing a P0400 code, it means your Exhaust Gas Recirculation (EGR) system isn’t flowing as it should. This can lead to rough idling, reduced fuel efficiency, and higher ...

Modern cars speak in codes when something’s wrong, and P0400 or P0720 can be their way of crying for help. These trouble codes point to issues in emissions or transmission systems that affect ...