Ford

Is this a persistant occurance in fiestas? if not what does this usually appear on the dash for? ie what are the reasons for the appearance of the engine light, what problems can this signify?

There could be a thousand things that cause the engine light to come on. but if it came on right after you filled your gas tank try tightening the fuel cap if that doesnt work then you can take it to the nearest repair shop and they can tell you whats going on