I had a similar issue with my 2001 Elantra.
Turns out the airbag wiring has a plug under the console.
If you EVER spill a drink into the cup holder or around it, it will
leak throug and get the connection wet. Increases the resistance and
the computer thinks the airbag is defective.
If you are able, pull the console and wrap the plug with waterproof
tape,(after you dry the plug and clean it) The real rubber kind not
the regular electrical tape.
Once it's dried out you shouldn't have the problem again.
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