The code P0420: Catalytic efficiency below threshold, bank 1.
This could be due to a faulty oxygen sensor or bad catalytic converter.
This is emission related and for the most part does not impact drivability.
However, this will cause the vehicle to fail emission testing.
I have attached the diagnostics steps below for your reference.
Let me know of any questions.
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Tuesday, April 19th, 2022 AT 11:19 AM