A Loose or worn gas cap may cause Check Engine Light to illuminate.Google+
Car Problem Reports
Saturn Outlook Check Engine Light Due to Gas Cap Issue
Saturn Outlook Problem
Average Mileage: 77,000 mi (45,000 mi - 100,000 mi)
Visitor, 2008 Saturn Outlook, 100,000 mi
Replaced gas cap with one from the dealer, light went out, but came back on a few days later. Went to dealer and had a module? in the gas tank replaced. Cost $500. Three months later, light on again and again it was something in the gas tank that had to be replaced. Cost $200
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.
Visitor, 2008 Saturn Outlook
Had the engine light checked and they said it is the gas cap.