air bag sensor

You're a brave man if you attempt to work with any airbag stuff.

Although, I suppose if you pull the battery and then verify the connections are open with an ohm meter before reconnecting, you should be fine.

I like the fix for my old clunker that has the same issue. Black electrical tape over the cluster panel. I tried yanking the light, but that causes some warning chime to go off.

Unless your 91 is in very nice shape, I'd be hard pressed to make this repair.

Maybe bad , maybe not. Unhook it and check its connections. Clean the mount area with fine sandpaper or such and put it back together and see if the codes change. I had 9 blinks on my taurus and it turned out to be the air bag diagnostic modules. I changed the sensor, no change. Swapped it for a salvage one. No change. I changed the diagnostic computer. Then it went back to normal. If you have any u pull yards in your neck of the woods, you need to pay them a visit and scavenge a sensor and a diagnostic module. The only information your going to find to help you is in the factory shop manual. And be sure to unhook the battery for an hour before working on it to be safe.

Bob