CEL can be anything or nothing. If it's comes up just after your odometer has passed a solid point like 20,000 40,000 100,000 etc... It's probably the scheduled maintenace reminder.
Otherwise you could be in trouble but check/change the gas cap. If the light doesn't go out after a few days and maybe half-dozens start-ups then it's something else but that's the most common reason for that light to come on.
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