P0420 on the 2014 Honda Civic
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| A22-045 | 2022-10-24. Service bulletin. Service Bulletin - Sensors on the vehicle may have misinterpreted the catalyst as deteriorated. Update the PGM-FI software if P0420 is present. |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.