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2025 Hyundai Tucson — catalyst efficiency code but car drives normally

HighwayTraveler475Community StarterMay 5, 20262025 Hyundai Tucson Hybrid LimitedCalifornia
2025 Hyundai Tucson Hybrid Limited, about 29,500 miles. A catalyst efficiency code came back after clearing once.
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3 replies

V8Fan67Community StarterCommunity StarterMay 5, 2026permalink
If it were in my driveway, loaded-suspension checks on the 2025 Hyundai Tucson catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. If they can't show the line item, I assume it's hiding. Not trying to scare you — just skip the expensive first guess. Doing the boring step first on purpose.
CanyonDetailer620Community StarterCommunity StarterMay 5, 2026permalink
Quick add on that: Swap the cheap/easy piece first on the 2025 Hyundai Tucson and see if the fault moves. You'll know quickly if you're on the wrong tree. On “catalyst efficiency code but car drives normally,” that was the fork that mattered for me. That's the sequence I'd use. If it repeats twice more I'll book time.
V8Fan67Community StarterCommunity StarterMay 5, 2026permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2025 Hyundai Tucson and see if the fault moves. Don't erase codes until someone who can help has seen them. If they can't show the line item, I assume it's hiding. Only after sitting overnight so far.
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