I bought a new sensor to fix that on my old 95. It is located so far back in the door cavity that you cant even see it, have to go by feel, and with two fingers. Needless to say, they never made it in the car.
Mine only had the light on the warning system near the console illuminated. A perfectly square piece of electrical tape solved that.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles