What is the problem? Is it not coming on when you turn the key to run? The MIL or SES light indicates a problem with one or more of the engine sensors, or that the sensors are telling the PCM there is a problem. The more information you provide, the better the feed back you get on a board like this. Do you work on your car? If you are at the mercy of a shop, lots of jobs can get expensive. Like I said, you aren't giving us enough information to help you.