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service engine soon light stays on. on 2004 Buick LeSabre

car seem to run fine

Asked by for the 2004 Buick LeSabre
Look here and you'll see there can be hundreds of possibilities for this light to be on: 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.