How do you turn off service engine light soon 2004 Buick lasabre?

To turn off the "Service Engine Soon" light on a 2004 Buick LaSabre, you can first try disconnecting the battery for about 15 minutes, which may reset the system. However, if the light is on due to an underlying issue, it's important to diagnose and fix that problem first, as simply resetting the light won't resolve the cause. You can also use an OBD-II scanner to read any diagnostic trouble codes (DTCs) and clear the codes once repairs are made. If the light persists, visiting a mechanic for a thorough inspection is recommended.