You need to have a scanner plugged in to see what error your computer has found. It may or may not be expensive or a major problem. Some of the chain auto parts stores will do a scan for free.
Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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my check engine light has been on for 4 years and when i work on it and disconnect the battery it turns off and sometimes stays off for months. it is a common problem for millenias
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