Quote:
Originally Posted by 96greengt
You are actually over thinking the situation. The #1 failure from the P0401 code is normally the DPFE sensor, once 50+k miles happens, then the carbon becomes a factor, unless the owner really used shitty gas from mom and pop gas stations or ran fuel conditioners of all brands in the gas.
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Well, I won't argue any of that. Everything that I found (internet) on this issue said DPFE. Regardless of the clog though, shouldn't the EVR get the signal to open if the PCM is reading the DPFE as it should? Why do I not see any vacuum from the EVR during test drives when the EGR curve rises? I may be over thinking as you said, but shouldn't the EVR at least open?