Air Bag Light stays on every time I start the engine.

There are a few things that can cause this, either the air bag itself going bad, or an airbag sending unit or brain going bad,

It may appear if there is a particular sensor fails.
Try stopping the indication using the following technique.
Sometimes the problem could be solved.

If you can get an OBD 2 scanner off eBay (US$ 6), you could be able to communicate with your car ECU (Electronic Control Unit) using the smart-phone app.

So that, there is a chance to CLEAR all the error indications.

After that, if problem still persists, it means the vehicle need full scan (you can't do this at home, probably seek a vehicle garage).

Clarification:
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