Air bag light stays on.read out has service air bag.

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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If the air bag light comes on and stays on it is telling you there is a problem with the system and the air bag(s) is disabled. Until the problem is fixed, the light will remain on and the airbags will not work. Special software is required to read and reset the airbag system. God-Bless!