Question about 2004 Mazda 6
P0401 is a low egr flow code. It is rarely the EGR valve and more often than not the DPFE sensor that has failed. To find the DPFE sensor follow the metal tube from the EGR valve to the exhaust pipe. There will be two rubber hoses attached to that tube. The DPFE sensor will be on the other end of those hoses.
Make sure there are no holes in the rubber hoses. This can cause false codes as well.
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
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