I had the same problem in my truck. It is the connection at the driver side seat belt. It still happens the odd time in my truck if I adjust my seat all the way forward and then back. It is just a bad connection at the wiring harness that hooks up to the seatbelt. Beleive it or not, I was told the air bag deployment is based on the seatbelt, so that is why that harness is related to your problem Or at least in my case anyway. I have a 200 Ranger. The airbag light, on the dash, was on when I bought it, used. I was able to find the answer on the Ranger forum. Here it is. If the light is out for the switch to disable the right aribag (under the center of the dash) it causes the complete airbag system to not work. I went to radio shack and bought a bulb and soldered it in place of the other bulb and everything works fine. The Radio Shack number is 272-1099 . They come in a pack of three, red, green, and white. I used the white one. Think the cost was $1.50 or there about. If you take it in to a garage it may cost you $150 or more. They will change the whole assembly.
You would have to take it to a Ford dealership so they could diagnose why the airbag light is on. It is not something that you would want to do yourself.
The airbag light stays on when the computer detects a malfunction and sets a code.
If the cause of the code was fixed the light would have gone off on its own.
The computer has detected a fault in the airbag circuit.
The airbag light would have nothing to do with emissions. If they are doing a safety inspection, it would fail.
The light come on when the system detects a problem and sets a trouble code. You should have it diagnosed by a trained technician. The airbag system is not for do it yourselfers. The light is on because there is a problem with the air bag system.
The computer
an airbag warning lite (srs)can be cuased either from a censor or a major problem
A malfunction has been detected - get it checked out
Many things could cause this. Loss of air pressure, air pump not working, etc.
You have a malfunction in the air bag system. The air bag system is inoperable when light is on. Take it to a qualified mechanic for repair.
There is not much chance that your airbag would malfunction and just deploy, but if the airbag light is on there is a 100% chance that it will not operate properly in the event of an accident. You need to have the car inspected at a dealer or certified repair shop if the airbag light is on and remains on.