Problem: check engine light staying on? on 2002 Ford Explorer

Diagnostic code: po4o1

2 answers
Google " p0401 Ford Explorer 4.6" there is a youtube video and the two links below that as well have good information.
Hello it seems as if you have a fault in the differrential pressure feedback egr sensor that is causing the fault code p0401.I say change the DPFE sensor and then recheck the sensor voltage ref.HAVE A BLESS DAY from DR.RECO.