Truck has been running great. I get in last night and the check engine light is on. And stays on. It recently has gotten very cold where I live. If that matters. Any ideas to what it could be without using a code reader? 2015 F-150 King Ranch

 

Do you have any mods to the truck at all?

 

No way to tell without pulling code's It is a 15 let the dealr fix it that is why you have a warranty.

 

Generic overview;

Amber light= emissions fault

Red light= critical fault, don't drive the truck

most auto parts chains will read the code for free, without the code being read, no way to know.

 

Just had my 2016 in for hat same thing, they found the ambient air temperature sensor was bad.