Originally Posted by Motorcraft
check the little pressure switch on the e-brake lever, its most likly bad and needs to be replaced.
Mine went bad last year. It wasn't a normally stocked part at any stealership in my state, so it took a couple days... Even the new one is touchy, and will stay on sometimes, even though the pedal is not engaged.
To test if it's the sensor, pull out the wire harness, which should have 1 wire. Ground the wire, and the light will come on the dash. That's how I checked mine.
I think it was like 15 bucks or so.