Illumination of the Check Engine Light may be the result of a loose or worn gas cap.Google+
Car Problem Reports
Oldsmobile Silhouette Check Engine Light Due to Gas Cap Issue
Oldsmobile Silhouette Problem
Average Mileage: 142,533 mi (113,500 mi - 159,100 mi)
Visitor, 2002 Oldsmobile Silhouette, 113,500 mi
service engine soon light illuminated, took it to a mechanic and had the obd 2 read. came back with p0410 code= emission. was told that it will cost 600.00 dollars to fix. googled the problem and found a thread that said to change the gas cap, fill up the gas tank and wait a day or two and light should go off. so i changed the cap,filled up, a day later,bada bing light went out... thanks you google!!
Visitor, 2004 Oldsmobile Silhouette, 155,000 mi
Gas cap is loose and service engine light it on.