Got a 2012 FX4 SCREW 5.0L 4 weeks ago w/ 58K mi. This past week it was shuttering when it was idling, so i read up on the forums and did an "italian tune up" the shuttering stopped (this was about 2 days ago). Got in the truck this morning and it is spitting out a P0175 code. Couldn't find much info on this code for a 2012, i saw a lot of posts for older trucks but nothing for a 11-14. My bronco had this code and i remember it was a beast diagnosing. Does anyone have any guesses as to where i should start? My guess was O2 sensor based on what i saw for the older model posts.

 

You should still be (just) under the 5 year 60k mile power train warranty. I'd take it in to ford for them diagnose. I had a code in mine, can't remember which, that was a bad catalytic converter.