P1401 - EGR Temperature Sensor
- 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
- Damaged Powertrain Control Module (PCM)
- Engine Light ON (or Service Engine Soon Warning Light)
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.
P1401 Information for specific makes
P1401 BMW Heated Catalyst Current Too High During Heating Bank 1
P1401 FORD DPFE Sensor Circuit High
P1401 HYUNDAI DMTL Performance
P1401 INFINITI EGR Temperature Sensor
P1401 KIA EVAP system malfunction
P1401 LEXUS Sub-Throttle Position Sensor Range/Performance Problem
P1401 LINCOLN DPFE Sensor Circuit High
P1401 MAZDA DPFE Sensor Circuit High
P1401 MERCURY DPFE Sensor Circuit High
P1401 MINI Heated Catalyst Current Too High During Heating Bank 1
P1401 NISSAN EGR Temperature Sensor
P1401 SUBARU Fuel Tank Pressure Control System Function Problem
P1401 TOYOTA Sub-Throttle Position Sensor Range/Performance Problem
P1401 VOLKSWAGEN EGR Valve Power Stage Short To Ground