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 ...

Your car’s EGR valve plays a huge role in reducing harmful emissions, but when it fails, it can cause rough idling, poor acceleration, and higher fuel consumption. Understanding how it works and ...