Whenever the "Air Bag" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the SRSCM (Supplemental Restraint System Control Module). You'll need a Hyundai Scanner to retrieve any codes recorded/set in SRSCM. Once you do this and let us know what, if any codes are set, then we can go from there.
Does the 2001 Hyundai Sonata GLS w/ AT transmission have a filter or do you just change the oil and...
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Does the 2001 Hyundai Sonata GLS w/ AT transmission have a filter or do you just change the oil and case gasket?