so i go to set my truck back to stock tune today.(was going to sell the programmer) scans my truck everything is fine says programmer has been programed but when i click yes to go into the screen it throws code 91? what does that mean? i had the truck in the ford dealership for the air induction cleaning. would they of flashed my pcm ? did i just lose that programmer? hypertech says they cant help me.

 

I think your truck was reflashed at the dealer.
Before taking it to the dealer did you put your truck back to stock?
If you didn't, the programmer is telling you that a stock program is still loaded on it. You will have to get it reset by hypertech and pay for it to be done.
I Googled "Hypertech Code 91" and came up with a bunch of results.