2006 ford f150 lariat engine turns over but will not start.

I have a 2006 ford f150 right at 180,000 miles and
it will not start.Thought it was the Fuel drive
module at first but it wasnt truck is get perfect fuel
pressure. Took it to the shop and they put it on the
scanner and it at first read cam shaft
sensors,changed both of them and truck still not
starting.So they are leaning to the anti theft mode
has it locked out or the chip in the key is bad....
Has any one else has had this problem before??? if
so please give me some ideas of what is causing
the problem.