FORD ENGINE CODES P0401 CODE

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The Differential Pressure Feedback Exhaust sensor (DPFE) has a high failure rate. Ford, for example, senses exhaust flow in front of and behind a restriction in the line between the EGR and the intake manifold. Every car maker performs the monitoring using a different method. Then, it monitors how well the EGR actually performed. The computer tells the EGR how much to open, based on engine temperature and RPMs. Because sending exhaust into the mixture at idle would choke the engine, this is usually done when the engine is running at higher RPMs where it can handle the incoming exhaust. To reduce combustion chamber temperatures, the EGR valve opens and sends in a ballast charge of exhaust. 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. If you have a P0401 Insufficient EGR Flow trouble code, read this to understand what it meansĮGR stands for Exhaust Gas Recirculation.

FORD ENGINE CODES P0401 CODE

Trouble Codes > P Code Definitions > Generic non-manufacturer-specific P code definitions > P0401 P0401 P0401 Insufficient EGR Flow

Ford engine codes p0401