I have a 2002 F-150 with the 5.4 and i am getting code P0405, it said EGR flow sensor A circuit low input. Now from talking with the dealership, they said there is 2 different flow sensors one before and one after the EGR . I dont know which one it is and the dealer wants to charg me 85$ just to tell me....can any one help me figure this out...any help would be apreciated.

 

https://www.f150online.com/forums/li...ebodyclean.php

try this first... it could jsut be clogged with crap mine was