P0420 on the 2019 Hyundai Tucson
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.
| 20-FL-010H | 2020-11-06. Service bulletin. This bulletin provides information related to the repair of DTC P0420 “Catalytic Converter System Bank 1 - Efficiency Below Threshold” found stored in the Engine Control Module (ECM). The repair involves performing an ECM Update and replacement of the exhaust manifold catalyst. |
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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.