All,

Does anyone have a good youtube link or other tutorial showing the best way to fix these codes? I know it is an Evap System Leak (Large Leak) and I have already cleaned my capless gas tank inlet and it seems to have helped for some time (3 months or so) but I am getting the reading again. I have seen conflicting messages on what to replace to resolve this. I may try cleaning the cap again but I figured the parts to replace under the hood aren't too expensive so I could replace them as well.

I have a 2017 F150 3.5L V6. Another recommended forum would be great too.

Thanks!

 

Do that first. If the problem is "back there", it makes zero sense to replace anything under the hood.

YT has a SEARCH feature....

 

Same as any code: DIAGNOSE the circuit &/or system indicated by the code definition. Learn how the circuit/system works, and then find out why it's NOT working that way. Then decide how to repair it (which does NOT always involve replacing parts).

Cost of parts is irrelevant to diagnosis - the tire valve caps are cheap, but that doesn't mean you should replace them. And replacement parts are RARELY as good as originals, so you should try to KEEP the original parts until 1) they're due on the published maintenance schedule, or 2) they fail a published test.