Disconnect the negative battery terminal wait 5 minutes and reconnect. This should clear the codes. Start the vehicle and see if the light comes back on. If it does take the vehicle to Auto Zone and have them tell you what code it is showing. Most likely it is an O2 sensor which is fairly easy to replace. The code will tell you what needs replaced. Do the repair and then follow the first instructions I gave you and that should resolve the problem.
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