Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for your question, my name is Steve and I am a fully qualified vehicle technician with over thirty years in the trade, Hopefully I can help.
As both keys have failed at the same time it is as you say unlikely that the problem is the Fob battery. The keys may need reprogramming to the vehicle as can sometimes occur.
This is only possible using dealer level equipment and so I would recommend that as the vehicle should still be under warranty you contact the dealer to resolve the problem
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Hyundai are very good on their warranty, I would expect it to go well.
If it is just batteries its quite easy, I have attached a diagram showing the method of opening the fob