i bought my fiesta st 6 days ago and now the engine management light has come on. it happend after i tried changing into second from first but car seemed like it was in first still and so on with 3rd and 4th gears untill finally it went into fifth. started it half hour after and car drove fine but engine management light was on the dash board. this isnt flashing. ne ideas if its worth taking to a garage has i know they cost alot to plug into the car to find out if there is a problem. please help