Is it reasonable that my 2014 Hyundai Accent with 105000 miles on it would need a catalytic converter? What am i doing wrong?
That is extremely early for a catalytic converter to need replacement.
If the engine consumes a lot of oil, that might explain it.
Is it reasonable?
No.
Is it possible ?
Yes.
If the catalytic converter isn’t physically damaged, I suggest trying this first before replacing.
https://www.walmart.com/ip/Cataclean-Exhaust-Fuel-System-Cleaner-16-oz/135378546
Tester
How do you know the cat is bad? Might it be the oxygen sensor(s)?
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Are you in California?
Yes, it is certainly possibly.
You might try taking it to a Hyundai dealer. Most of the exhaust components have an 8 year factory warranty on them. Being a 2014 model, you might just slip into a warranty replacement.