P0420 on the 2002 Volkswagen Jetta
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.
| 01 08 14 | 2008-04-24. Service bulletin. UPDATE PROGRAMMING, MIL ON, DTC'S P0420 AND/OR P0300-P0306 STORED IN ECM FAULT MEMORY. *NJ |
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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.