ACZL wrote:
Ford I believe had Nox sensor issues thus extended warranty for years '11-'14 (I could be wrong). My '15 F350 was problem free when I traded it w/ 30K miles. My '17 F350 DRW also had the block heater cord replaced along w/ the DEF heater. Now I have a Nox sensor issue which Ford is trying to deny it's bad because their data says "That use of aftermarket fuel treatment can cause problems". It's been back to dealer 2x w/ same problem, going back for 3rd time tmrw. Funny thing here is, had DW take it to a dealer near her workplace and they said they couldn't fix it because they wouldn't get paid for it due to another dealer already having diagnosed it. Some warranty thing.
Dealers will try anything to get out of warranty work and will also makeup “problems” that you can’t live without fixing.
How they’d know whatever fuel treatment you used is either because they did some sort of fuel sampling and analysis and have data to back it up ( not likely at all). Or the service guy/mgr picked up on unnecessary info you provided and is attempting to use it against you to make some money off of you and your truck (far more likely).
Lesson learned, not just with vehicles, but one has to watch how much “info” they divulge.