Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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Most reported 2003 Saturn L300 problems
A burning smell may develop due to an oil leak form one or both valve cover gaskets. Resealing the valve cover will generally correct this concern. However, the valve covers should be inspected and replaced if damaged.
My dome lights went out on my 2003 saturn L300. My mechanic is quoting $800 to replace the body control module to fix this issue. He says that saturn parts are becoming harder to come by and recomends that I replace the BCM now to avoid further controll issues with my spedometer, cruise control and other lighting systems. Hmmm.... not sure what to do.