Delete if not allowed... but I have a 2011 check engine light popped on roughly 100k miles pulled code and it says common fix is MAF sensor. (If I remember correctly it said bank 1 and 2 to lean) Then lists hole/bad piston, head gasket, and filled gas. I'm honestly confused about the filled gas part. But I'm not thinking it's a bad piston because she's running strong like always. I did filler up with E85 this time because for the whole tank I'll come out saving roughly $10. Any suggestions on what it is? In my opinion it's to new for the MAF to take a crap this early same with everything else.

 

I'm not sure if I can help you, but what is the DTC?

 

E85 will also get you close to 30% lower MPG. Seldom makes sense.

 

I'd try cleaning the maf sensor with some of this stuff....

 

Good inexpensive first step. OP, DO NOT use anything but MAF sensor cleaner. DO NOT touch anything inside the sensor, just spray only, NO wire brushes, no pipe cleaners, nothing.

 

You need to remember that it lists POSSIBLE causes for the code. It's just like possible side effects for medications.

 

So I cleaned it... smelt antifreeze checked it it had nothing in the reservoir. I search google 5.0 f150 using coolant and found this website. Also after looking thoroughly I've concluded that the o ring they are talking about is how I'm loosing coolant.

http://www.f150online.com/forums/2009-2014-f-150/494461-2011-f150-v8-5-0-antifreeze-leak-bad-o-ring.html

but this leak wouldn't have thrown a lean code would it??!??!?