P0431 on the 2006 Mitsubishi Eclipse
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.
| TSB-13-15-001 | 2020-04-24. Service bulletin. Due to variations in production, certain exhaust manifold mounted catalytic converters may experience catalyst layer separation on affected vehicles. If this occurs, the MIL will illuminate with DTC P0421 or P0431, "Warm Up Catalyst Efficiency Below Threshold" stored in the PCM. Mitsubishi Motors North America, Inc. is extending the catalytic converter warranty only on affected vehicles currently registered in certain states from 8 years / 80,000 miles to 10 years / 120,000 miles. |
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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.