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P1400 on the 2001 Ford Expedition

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.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P1400
041112004-07-24. Service bulletin. STREAMLINED DIAGNOSTIC PROCEDURE FOR VEHICLES WITH MALFUNCTION INDICATOR LAMP (MIL) ON AND DIAGNOSTIC TROUBLE CODES (DTCS) P0401, P0402, P1400 OR P1401. ADDITIONAL SYMPTOMS MAY INCLUDE RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY. *TT
032232004-06-16. Service bulletin. STREAMLINED DIAGNOSTIC PROCEDURE FOR VEHICLES WITH MALFUNCTION INDICATOR LAMP ON AND DIAGNOSTIC TROUBLE CODES (DTCS) P0401, P0402, P1400 OR P1401. ADDITIONAL SYMPTOMS MAY INCLUDE RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY. *TT
03222003-09-03. Service bulletin. STREAMLINED DIAGNOSTIC PROCEDURE FOR VEHICLES WITH MALFUNCTION INDICATOR LAMP (MIL) ON AND DIAGNOSTIC TROUBLE CODES (DTCS) P0401, P0402, P1400 OR P1401, OR RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY, AND THE ABOVE LISTED DTCS WITHOUT MIL. *TT
03612003-07-23. Service bulletin. MALFUNCTION INDICATOR LAMP ON WITH OR WITHOUT ROUGH RUNNING, LACK OF POWER, SURGE OR POOR FUEL ECONOMY WITH DIAGNOSTIC TROUBLE CODES P0401, P0402, P1400, P1401. *TT *JB

4 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.