Illumination of the Check Engine Light can be caused by a loose or worn gas cap.Google+
Car Problem Reports
Oldsmobile Cutlass Check Engine Light Due to Gas Cap Issue
Oldsmobile Cutlass Problem
Visitor, 1998 Oldsmobile Cutlass, 77,600 mi
Check engine light comes on. I have a device that reads the computer code. It tells me to replace the gas cap. I have done so three times. Problem keeps returning. My problem is that I have trouble filling up my gas tank. It's like I have a vapor lock in the tank. The gas pump keeps clicking off after only a quarter of a gallon of gas is put in. Takes me about 10 minutes to fill my tank when this problem occurs.