A Loose or worn gas cap may cause Check Engine Light to illuminate.
Car Problem Reports
Saturn Outlook Check Engine Light Due to Gas Cap Issue
Saturn Outlook Problem
Average Mileage: 65,500 mi (45,000 mi - 86,000 mi)
Visitor, 2009 Saturn Outlook, 45,000 mi
Check engine light came on...filled the tank up with gas, closed the gas cap and light turned off.