2002 Grand Cherokee 6 cyl. Question about a recent and consistent check engine light coming on.?

The car runs great. No problems whatsoever, but the engine light came on about a week or so ago, and does not shut off. Is this some sort of automatic reminder to have some sort of service performed ? The car has just reached 75,000 miles. Chrysler/Jeep techies, come to my rescue !
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