Code p0401 is not the pressure sensor ?

The P0401 code on a 2001 Ford Explorer indicates "Insufficient EGR Flow."

Yep! Pull the egr off, clean the port under it all the way to the throttle plate, I use a length of steel coat hanger...put it all back together, reset the codes, if light comes on again, replace the EGR position sensor, that's the one the two small hoses from the exhaust plug into!

Here is a video to help test the EGR and the location in the image's below

https://youtu.be/DqUCbbKdWf4?si=EtixUFFIB5jdETwM


Check out the images (below). Let us know how it goes

if i just buy a new that i need to still clean it up ?

do not replace parts until you clear the port out. Y out might not need parts.