Interesting, I had this same issue on mine right after buying it. When I bought it I had no issues of this whatsoever, but being a GDI engine, I did a 4 part fuel system and top engine cleaning, as well as a restoration kit (all products of Valvoline). It wasn't until shortly after that I started getting this message. After doing a lot of research, I was nervous because it seemed to be a known issue, with not so good or known fixes. I decided I wanted to start with the simple/obvious thing, and replaced the switch and crossed my fingers. Still did it for about a week after. Then noticed after doing more research, it could be something as simple as a dirty throttle body causing this issue. Thinking back, this made complete sense, as part of the fuel system cleaning is shooting the vapor cleaner into the intake system. I let it ride for a few more days thinking that may have been the issue, and it stopped giving me the warning, and all is well once again. That was a frustrating time though, I will admit that.
Mine has 202k on it (2013 FX4) and is running like a champ! Bought it for $10,900, and I sold my 2011 XLT 5.0 that had 160k for $14,200. For me, I won't go back to the 5.0. My buddies EB is at or close to 200k and still running strong as well.
