2005 Buick LeSabre Owner's Manual - Page 156

Service Vehicle Soon Light This light will come on and stay on if your vehicle has certain non-emission related problems. Fuel Gage These problems may not be obvious and may affect vehicle performance or durability. Consult a qualified dealership for necessary repairs to maintain top vehicle performance. This light will come on briefly when the ignition is turned on to show that it is working properly. United States Canada The fuel gage shows about how much fuel is in your tank. It works only when the ignition is on. When the indicator moves to the edge of the low fuel warning band, the low fuel warning light will come on and a chime will sound. You still have a little fuel left, but you need to get more fuel right away. 3-46