Hello,
It is possible to have a defective part, it can also be due to a faulty catalytic converter or issue with the oxygen sensor circuit.
Many times, these codes are just emission related and might not impact drivability. But it will not pass emission inspection, if you are in a state that requires it.
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Which code did you get was it P0420? or was it a different one?
Let me know if there were any other codes.
Thank you.
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Friday, February 4th, 2022 AT 7:55 AM