Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
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Sounds like it could be the immobilizer feature of the anti-theft system has been triggered. Is the anti-theft warning light on the cluster? Are you using the correct transponder key?
By "the only key in the ring", do you mean it is the correct transponder key? Are there any of the original remote fobs available?
I'm glad to hear the issue is solved. Have a Happy New Year!