Hey everyone, I have a code P219a and b showing up. Originally came up as oxygen sensors, replaced those and now its the new code. I can't find any air leaks anywhere (neither could the dealership) and the truck runs great, no rough idle, no stalls, and good gas mileage. So I think I can rule out fuel issues. Looking for some guidance on what to check next. Dealership said maybe the intake manifold gasket or fuel injector o rings. Is that the right way to go? Thanks for any help!

 

welcome to this site, please make a new user intro post
as to your code, google it up, as one thing that pops up is a dirty mass air flow sensor another is vac leaks

 

Im having the exact same issue. I had po151 true code then a 131 pending that went away. Replaced both anyway. Reset computer and in the drive cycle p219b showed up as pending but I pulled over and reset anyway was thinking it was just a fluke. Then 219a showed up as pending then went to true code. I was wondering what were you able to find out? I got mass sensor cleaning and was gonna start there. I have 2017 3.5 ecoboost in an expedition.

 

I am having the same issues. I replaced both upstream oxygen sensors and not i am getting P219A & B. I did a log on Forscan and fuel is reading good and O2 sensors seem to be inline with each other. off less then .2. Purge valve is good.
Did either one of you find the fix?