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The Check Engine light is on because the computer has detected a problem with the emissions system. It may be nothing more than a loose gas cap or something more serious. You will need to get the computer scanned with an OBD2 scan tool. Some Auto Parts store will do this for free in some states. This will give you the fault code. This code will not necessarily tell you what the problem is but will tell you what component is being effected. Diagnosing the problem requires skill, knowledge, and experience. Do not just throw parts at the problem without actually knowing what is wrong. You may very well end up spending more money in the long run. If you do not know how to diagnose the code provided, then take it to a professional.
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