We recognize that it is frustrating to have your vehicle diagnosed and repaired only to have the ‘check engine’ or ‘service engine soon’ light come on again. The function of your vehicles computer and the 'check engine' or 'service engine soon' light is to warn you of a problem. This might be related to the repair or it might be an entirely different problem. If there are several issues with the vehicle that the internal computer is detecting, the light will come on sometimes right away, sometimes later on down the road. You will need to have the vehicle re-inspected and possibly diagnosed to determine an additional problem.