I would unplug the battery for about 15-20 minutes, which will completely reset the computer. If it is still on after that, I am out of ideas...possibly a short in the dash that is tripping the light bulb to stay on.
post back and let us know if unplugging the battery solves it.
2001 GT Convertible
Show: Mach 1 Chin Spoiler, White face Guages
Go: CAI, 75mm TB/Plenum, UDP, X-pipe, Flowmaster cat-back, stock tune, (4.10s waiting to be installed)
Suspension: FRPP C-Springs, UPR CC Plates, Tubular UCAs/LCAs, BBK STB, Steeda Shock Tower Brace(MMSFC waiting to be installed)
163k miles - 240hp/282tq - 14.23s @ 98.65mph