2004 check engine lite

Donald Camps · 2007-01-01T20:12:55+00:00

I have a 2004 f150xlt with 5.4l eng. 9,000 miles, and its still under warantee....The fail safe lite comes on, and goes out when I restart the engine...after several times, I reseated the gas cap...Now the check engine lite is on...I lifted the neg terminal on the battery to reset the computer, and Its ok now....This has happened several times. I have gone to the dealer and the lite was out..They claim ford will not pay for any diagnostic test, unless the check engine lite remains on so they can pull the code. They claim that 90% of the time its the gas cap....I would appreciate any input on this...Thanks in advance.