You have restriction in the exhaust somewhere and it's causing it to backflow.
Dpfe sensor is the delta (differential) pressure feedback egr (exhaust gas recirculation) it monitors the pressure on the egr valve to make sure it is working.
This sensor varifies flow of the exhaust gases to the intake manifold. If flow is interupted the sensor will inform the onboard computer that the exhaust recirculation system has failed resulting in a check engine light to come on.
exhaust recirculation valve, helps with your emissions
Code 0404 is the exhaust gas recirculation circuit range performance problem. Code 0405 is the exhaust gas recirculation sensor A circuit low.
The exhaust gas recirculation (EGR) system has insufficient flow. It could be caused by the differential pressure feedback EGR sensor being faulty, there t is a blockage in the EGR tube (most likely from carbon buildup), the EGR valve is bad, or the EGR valve may not be opening.
P0406 Exhaust Gas Recirculation Sensor A Circuit High
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P0400 - Exhaust Gas Recirculation Flow Malfunction Possible causes - Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted - Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection - Exhaust Gas Recirculation (EGR) volume control valve stuck closed - Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve - Dead (Weak) battery - Faulty EGR temperature sensor and circuit - Faulty EGR Valve
exhaust gas recirculation sensorIt is a sensor that is mounted to the EGR valve. It moniters the position of the EGR valve and sends that info to the ECM.
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
According to my Haynes repair manual - the DPFE sensor monitors upstream ( before ) and downstream ( after ) exhaust backpressure . By calculating the difference between the two pressures , the PCM determines exactly the EGR flow rate at all driving conditions
Exhaust Gas Recirculation Sensor "A" Circuit High. Replace Sensor The sensor is part of the egr valve. Replace the valve.