P0400 on the 1996 Mercury Villager
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.
| 99103 | 1999-08-25. Service bulletin. ON SOME VEHICLES THE CHECK ENGINE WARNING LAMP MAY ILLUMINATE AND DIAGNOSTIC TROUBLE CODES 32, 35, P0400, P0402, P1400, P1401, P1402 OR MALFUNCTION INDICATOR LAMP 0302, 0305, 0306, 0514, 1005 MAY BE STORED INDICATING A MALFUNCTION IN THE EXHAUST GAS RECIRCULATION (EGR) SYSTEM. *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.