Check Engine Light Due to Gas Cap Issue on Saturn SW2

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

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Average mileage: 145,000 (145,000–145,000)
6 model years affected: 1996, 1997, 1998, 1999, more2000, 2001
8 people reported this problem
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problem details
when my gas is between 1/4 and a 1/2 or at a 1/4 it goes on not all the time about sometimes 1/2 the time then I go to fill up then it still stays on for about 2 to 3 days sometimes when I go up hill and speed up it will at most times go off I will open up gas cap but most times it doesn't help what can it be