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Posts Tagged: Insufficient EGR Flow

P0401 Ford Vehicles

Fix code P0401 Ford Vehicles If you haven’t’ already done so, read the full explanation of the DPFE system posted here. This is a very common code of Ford vehicles and can drive people absolutely crazy. Don’t get sucked into throwing parts at this problem. It’s really a fairly simple system. The computer wants to know if the EGR valve is recirculating the amount of exhaust gas that it instructed it to. In order to check that, the DPFE checks for a pressure change above and below a port. It … Read More


P0401 Insufficient EGR Flow If you have a P0401 Insufficient EGR Flow trouble code, read this to understand what it means EGR stands for Exhaust Gas Recirculation. At high combustion temperatures, the Nitrogen in the air can combine with the air fuel mixture to produce Oxides of Nitrogen–a key component of smog. To reduce combustion chamber temperatures, the EGR valve opens and sends in a ballast charge of exhaust. Because sending exhaust into the mixture at idle would choke the engine, this is usually done when the engine is running … Read More

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