Just wondering. Was one of the parts replaced the DPFE sensor? Did you double check that the two vacuum lines to/from the DPFE sensor are connected and leak free?
IF replaced, did you use an aftermarket DPFE sensor? Ford has changed the calibration of the DPFE sensor. Either buy a Ford supplied unit or use one made by a well known maker.
Finally did you double check that the EGR passage ways inside the throttle body aren't clogged with carbon? Consider taking off the EGR valve and throttle body to clean/check the EGR passage ways.
If you delete the EGR hardware the PCM will still throw a DTC code.
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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. |
- Vacuum supply
- 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
- Damaged PCM
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