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This DTC says nothing about changing the sensor or the connector or pig tail ! It's a circuit voltage low code P0405 - DPF EGR Sensor Circuit Low Voltage Detected
See DTC P1400
Problem with wiring or PCM ! P1400 - DPF EGR Sensor Circuit Low Voltage Detected
The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.
DPFEGR circuit short to GND
Damaged DPF EGR sensor
VREF short to GND
A DPF EGR PID reading less than 0.2 volt with the key ON and engine OFF or running, indicates a hard fault.
Without knowing what the actual code is, I can only give you general info. No trouble code tells the mechanic what the problem is. Only what to test or check. So O'Reilly was wrong if they said the code told them the injectors were clogged. And AutoZone was not right in saying the sensor is bad, the sensor MAY be bad. The trouble codes direct the mechanic as to what to check by saying the sensor is not sending the right data or signal, or the computer can not control a component correctly. In your case, the EGR sensor measures pressure and flow for the EGR valve. The valve may be faulty, or the sensor, or a hose in between. So the EGR system would need to be checked out to determine if a component needs to be replaced or not.
Exhaust Gas Recirculation (EGR) System
The exhaust gas recirculation (EGR) system is designed to:
reintroduce exhaust gas into the combustion cycle.
lower combustion temperatures.
reduce the formation of oxides or nitrogen (NOX).
The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the following:
exhaust system back pressure
engine coolant temperature
air charge temperature
The EGR valve (EGR valve) (9D475) is vacuum-actuated. The vacuum hose routing diagram is shown on the Vehicle Emission Control Information (VECI) decal.
The EGR system is a differential pressure feedback EGR Sensor system. Differential pressure feedback EGR Sensor is a subsonic closed loop EGR system. The differential pressure feedback EGR system:
monitors EGR flow rate by the pressure drop across the metering orifice located in the EGR tube.
uses a differential pressure feedback EGR sensor as the feedback device.
uses the EGR valve only as a pressure regulator, rather than a flow metering device.
controlled pressure is varied by the valve movement using vacuum output of the EGR vacuum regulator solenoid (9J459).
allows for a more accurate assessment of EGR flow requirements.
Differential Pressure Feedback EGR Flow Diagram
Differential Pressure Feedback EGR Sensor
Disconnect engine control sensor wiring (12A581) from Differential Pressure Feedback EGR Sensor.
Disconnect Differential Pressure Feedback EGR Sensor hoses from EGR valve to exhaust manifold tube (9D477).
Remove retaining nuts or bolts (depending upon application) and EGR Differential Pressure Feedback transducer.
Follow removal procedure in reverse order.
Tighten retaining nuts or bolts (depending upon application) to 5-7 Nm (45-61 lb-in).
ABout EGR codes, there are alot choive to look or diagnostic... are you chec or replace
the vacuum lines as well? If there is a leak, the DPFE will read
Did you reset the PCM or disconnect the battery after the repair? Assuming all fuses are good, the P1401 indicates a possible wiring
fault. Check the connector. Is it clean? Is it pushed in all the way?
Are the wires in good condition?
Since the DPFE has been replaced, likely there is a restriction in the
EGR line some where. This could also be a bad EGR valve. But first
ensure that the EGR valve vacuum line is attached and leak free.
If no problem found, then the EGR passageways in the throttle body
should be cleaned. Carbon will build up and block the EGR flow.
If still no problem found, consider replacing the EGR valve.
Keep in mind this information from Ford Service CD...
P0401 - EGR Flow Insufficient Detected
The EGR system is monitored during steady state driving conditions while
the EGR is commanded on. The test fails when the signal from the DPF
EGR sensor indicates that EGR flow is less than the desired minimum.
EGR valve stuck closed
EGR valve leaks vacuum
EGR flow path restricted
EGRVR circuit shorted to PWR
VREF open to D.P.F. EGR sensor
D.P.F. EGR sensor downstream hose off or plugged
EGRVR circuit open to PCM
VPWR open to EGRVR solenoid
D.P.F. EGR sensor hoses both off
D.P.F. EGR sensor hoses reversed
Damaged EGR orifice tube
Damaged EGRVR solenoid
Perform KOER self-test and look for DTC P1408 as an indication of a hard
fault. If P1408 is not present, look for contamination, restrictions,
leaks, and intermittents
P1401 - DPF EGR Sensor Circuit High Voltage Detected
The EGR monitor checks the DPF EGR sensor signal to the PCM for high
voltage. The test fails when the average voltage to the PCM goes to a
voltage greater than the maximum calibrated value.
DPF EGR circuit open
VREF short to PWR
Damaged DPF EGR sensor
DPFEGR circuit short to PWR
SIG RTN circuit open
A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running, indicates a hard fault.
Hope this helps (remember to rate and send us your comments about this answer).
p 1401 is a code for differential pressure feedback egr circuit high input there is a small square sensor on the engine with a vacuum line here is some info Exhaust Gas Recirculation (EGR) System Monitor” Differential Pressure Feedback EGR
The Differential Pressure Feedback EGR System Monitor is an on-board
strategy designed to test the integrity and flow characteristics of the
EGR system. The monitor is activated during EGR system operation and
after certain base engine conditions are satisfied. Input from the ECT,
IAT, TP and CKP sensors is required to activate the EGR System Monitor.
Once activated, the EGR System Monitor will perform each of the tests
described below during the engine modes and conditions indicated. Some
of the EGR System Monitor tests are also performed during on demand
The Differential Pressure Feedback EGR sensor and circuit are
continuously tested for opens and shorts. The monitor looks for the
Differential Pressure Feedback EGR circuit voltage to exceed the maximum
or minimum allowable limits.
The DTCs associated with this test are DTCs P1400 and P1401.
The EGR Vacuum Regulator solenoid is continuously tested for opens and
shorts. The monitor looks for an EGR Vacuum Regulator circuit voltage
that is inconsistent with the EGR Vacuum Regulator circuit commanded
i would still try to change your egr!!! sometimes egr test good but still they can stick open and that can cause idle problems so if you want to get your prob fix change egr valve
take that egr off and put in a new one !!!!