It could be that the plunger in the door (that turns the light on and off) is broke. Or it could that somehow the switch (at the headlight control) is turned on. Is there a separate switch at the light itself that could be on? If all else fails, yank the bulb.
There is no door plunger style switches on the Taurus / Sables.
Ford uses a different door ajar sensor, since at least 1996.
The "Related Questions" below has extensive information about dealing with those problems - and fixes. Easier than you might think...
The 2004 Ford Taurus has 12 valves.
The 2004 Ford Taurus has a V6 engine.
The 2004 Ford Taurus has overhead valves (OHV).
The 2004 Ford Taurus has a 4-speed automatic.
The 2004 Ford Taurus is a gas-powered vehicle.
The 2004 Ford Taurus is 16 ft. 5.6 in. (197.6 in.) long.
The height of the 2004 Ford Taurus is 4 ft. 7.5 in. (55.5 in.).
The 2004 Ford Taurus runs on regular unleaded.
The 2004 Ford Taurus's turning circle is 39.7 ft..
The curb weight of the 2004 Ford Taurus is 3306 lbs..
dome light stays on ford taurus
The 2004 Ford Taurus has 56.6 in. of rear shoulder room.