You need a gas cap...
The gas cap is missing or a sensor for the door is giving a false reading
your poor car misses its gas cap so much. have a heart and steal or even buy a gas cap.
One of your viechles sensors is telling you your gas cap is missing or not tighten down all the way.
you all ready answered the question , you have no gas cap
Unless you have a capless filler like on newer fords. You need a gas cap. Pick one up at a parts store or walmart. they are universal.
It ' s the nut behind the wheel
Maybe sensor broken.
Hmmm, seems to me you already located the problem...now, how to fix it...
Do you really have a license and drive on our roads?!!!
My car tells me : "check the gas cap". When i opened the gas door there isnt even a gas cap there.... So what is wrong with my car?