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if you have a MAF its the reason for a insufficient flow code. thats the only purpose of that sensor on these engines. proper egr flow means less room for incoming air and less air that the maf senses
what i want to know is with the latest calibration is anyone experiencing derated power due to p0401? or is that a myth..
Hum...I may have to look into this. I got a new OEM "tune"/flash last Dec or Jan, and it was/is definitely detuned, but I keep my EGR unplugged and do get the 0401 code, but no CEL. I may have to plug in the EGR, clear the codes and see how she runs on the way home tonight. I never put the two together, ie 0401 and less power.
2006 built 05/05 XLT CC DRW PSD. Captain chairs, sunroof, polished aluminum wheels, 6speed, manual 4x4. 285K miles with 130K problem free miles on new engine.