P1405 FORD – DPF EGR Sensor Circuit High Voltage Detected

P1405 FORD Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1405 FORD Possible Causes

Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor),Plugged or damaged EGR tube,Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted,Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection,Faulty Powertrain Control Module (PCM)

P1405 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 is 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.