P0420 on the 2016 Honda Fit
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.
| A18-027 | 2022-02-22. Service bulletin. Service Bulletin - 2015-16 Fit: MIL Is On with DTC P0420 |
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| A18-027 | 2018-04-16. Service bulletin. Service bulletin - The MIL is on and DTC P0420 (catalyst system efficiency below threshold) is set. Faulty fuel injectors in one or more cylinders may be affecting combustion and causing a false DTC P0420. |
2 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.