Air bag warning light permanently on on the dash board

• The Air Bag Warning light on your dashboard functions just link a check engine light does. When it comes on and stays on there is a issue and the only way to know is to get it Airbag Control Module scanned by a VAG com scanner.
• I don't know if Auto Zone can scan this but it is worth a try as they are free. If they don't then you will have to go to a repair shop and have it scanned. Once you get it scanned you will know what is causing the Air Bag Warning light to stay on. Then you can post it hear and I can assist you further. There is really know way to know until it is scanned.
• Hope this helps and thank you for using FixYa.

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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HI the air bag controller,or air bag control module uses inputs from the impact and safing sensors to determine if air bag deployment is needed .if at least one impact sensor and the safing sensor are closed ,the controller sends high current pulse to the air bag module.the pulse produces a small electric arc in the air bag module igniting the pyrotechnic material to produce gas expansion and bag inflation the air bag controller also generates trouble codes and energizes a warning lamp if it detects something wrong with the system i hope that will help you but you cannot fix it by yourself without a scanner to define where the problem is.