car seem to run fine
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2004 Buick LeSabre Question: service engine soon light stays on.
Answer #1Bret Bodas from RepairPal Test Shop, April 21, 2010, 09:58Master
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.