Join Date: Nov 2010
Location: South Fayette/Pittsburgh PA
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your pcm looks at inputs like MAF, IAT2 and EBP to detect EGR flow. you need to look at things like biased sensors, your EGR valve being stuck shut, cooler plugged or (if you are not the original owner) an EGR cooler bypass/blockoff. obviously if p0401 is the only code then the valve is still intact and plugged in
an insufficient flow code by itself makes me suspicious. what year is the truck? how long have you owned it?
Ford Senior Master Tech
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2015 F-250 XLT 6.7L
2006 F-250 6.0L SOLD