P0420 on the 1999 Chrysler Concorde
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.
| 1802302 | 2002-10-30. Service bulletin. CONCERNS WITH MALFUNCTION INDICATOR LAMP ILLUMINATION WITH A CATALYST EFFICIENCY FAILURE DIAGNOSTIC TROUBLE CODE (DTC P0420) RECORDED IN THE POWER TRAIN CONTROL MODULE (PCM). *TT |
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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.