Possible causes
– Faulty Differential Pressure Feedback Electronic (DPFE) sensor
– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection
– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection
Tech notes
There is a factory service bulletin for the following Ford models:
2000-2002 Ford Taurus
2001-2002 Ford Crown Victoria
2001-2002 Ford Focus
2001-2002 Ford Mustang
2001 Ford Explorer USPS
2001-2002 Ford E Series
2001-2002 Ford Escape
2001-2002 Ford Expedition
2001-2002 Ford Explorer Sport Trac
2001-2002 Ford Explorer Sport
2001-2002 Ford F-150
2001-2002 Ford Ranger
2001-2002 Ford Windstar
2002-2003 Ford Explorer
Ford Factory Service Bulletin OBDII Code P1401 Code
Sensor replacement procedure 2001 Ford Focus:
Note: User Submitted Video
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1401 FORD Description
The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.
The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).
The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which are connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.
The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).
The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which are connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.
FORD Technical Service Bulletins for P1401 code
2000 FORD TAURUS ELECTRICAL SYSTEM
2001 FORD CROWN VICTORIA ELECTRICAL SYSTEM
2001 FORD ESCAPE ELECTRICAL SYSTEM
2001 FORD EXPEDITION ELECTRICAL SYSTEM
2001 FORD EXPLORER ELECTRICAL SYSTEM
2001 FORD EXPLORER SPORT ELECTRICAL SYSTEM
2001 FORD EXPLORER SPORT TRAC ELECTRICAL SYSTEM
2001 FORD F-150 ELECTRICAL SYSTEM
2001 FORD FOCUS ELECTRICAL SYSTEM
2001 FORD MUSTANG ELECTRICAL SYSTEM