Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Resources for the Repair and Maintenance of your 2005 Saturn LW300
2005 Saturn LW300
2005 Saturn LW300 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.
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
GM recommends replacing the engine coolant at 100,000 miles; however, our technicians tell us that the coolant may become contaminated and require a complete cooling system flush every 60,000 to 70,000 miles.
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The ignition module or an ignition coil may fail causing the engine to misfire which can cause the Check Engine Light to illuminate or begin flashing.