EngineDIYCommunity Starter

2024 Buick Envision — catalyst efficiency code but car drives normally

BatteryCommuter524Community StarterNov 27, 20252024 Buick Envision AvenirWashington DC
2024 Buick Envision Avenir, about 42,000 miles. A catalyst efficiency code came back after clearing once. The car drives normally and there are no misfire codes. Before condemning the catalytic converter, what sensor/data checks are worth doing?
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DealScout262Community StarterCommunity StarterNov 27, 2025permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2024 Buick Envision and see if the fault moves. You'll know quickly if you're on the wrong tree. A shop burned me once by skipping that step. If the story changes I'll post the new data.
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