my 2.7 threw the code P051b , From what little info I could find it sounds like a crankcase pressure sensor, the code hasn't came back, but I'm concerned that is this something that needs to be looked at by the dealer or just a sensor with a hiccup. anyone have knowledge of this code?

 

Mine seems to be comin from the airbox..2017 3.5 ecoboost..Installed duals from cat back..Everything fine..Installed AFE dryflow and it set off the light.Replaced stock cleaner, light off..Have to see how long..