Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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.