P0140 on the 1999 Nissan Altima
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.
| NTB99019 | 1999-05-12. Service bulletin. SERVICE MANUAL PROCEDURE CHANGE FOR REAR OXYGEN SENSOR DTC(S) P0137, P0138, P0139, P0140, P0141 AND THREE-WAY CATALYST DTC P0420. *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.