Rick's Free Auto Repair Advice

Posts Tagged: How to fix P0401

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


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