What the heck does that mean? should i take it back to ford on monday?

 

i would....

 

I know this is a silly question, but is the gas cap on? :scratch:

 

yes the gas gap is on. i started the car and left the dealer, it was sunny andi had my sunglasses on so i didnt see the light right away till i got home. i called my dealer service dept but they closed in 5 minutes. light is still on. they told me maybe they forgot to hoo ksomething up? that is whack lol. i get one problem fixed and they cause another

 

I don't know if it's related to the new gas tank as they have a TSB out about lights coming on with no drivability issues (in other words the car is running fine). If I remember right all they have to do is reprogram a computer in the car.
The 'Service Engine Light' came on in my 05 Mustang GT at around 3200 miles earlier this month, took it in on Saturday and they fixed it in about two hours from the time I arrived.
What's strange with my car is that the light came on again, stayed on for a few days then turned off (this was AFTER I had the computer reprogrammed).