check engine light on 1998 Plymouth Neon

what could be the problam with the check engine light staying on.can't get car inspected

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2 answers
Clean the gas cap gasket and the gas filler mouth real well. Worked for me.
There can be many many reasons for a check engine light coming on, just look at this list of codes that will turn it on: http://repairpal.com/obd-II-code-chart
Do you know which codes your vehicle has stored in the engine control module?