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Q:

service engine soon light stays on. on 2004 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car seem to run fine
(1) Answer
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.