check engine light on 2001 Oldsmobile Silhouette

i have a check engine light on a 2001 oldsmobile silhouette..what could be the problem..

1 answer
Look here and you'll see there can be hundreds of possibilities: http://repairpal.com/obd-II-code-chart
You'll want to get the codes read out and have a diagnosis performed to know why the light is on.