my 00 ranger 2.5l has a check engine light on and i was told the error codes are p0401, p1401 and p0302 does anyone know how i can fix them thanks

I looked them up for you. here is the link i used http://codekeyunlock.com/ They are all egr( exhaust gas recirculation) related. you can start by cleaning out the system. it could be a lot of things, however it does seem like I read alot about how the DPFE sensor goes bad often. Rockauto has them satrting at $35 http://www.rockauto.com/catalog/raframecatalog.php lets see what other people have to say about your issue

*obviously first thing you should do is look for cracked hoses or leaks on the egr system

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).