P1401 is actually for the DPFE sensor. The DPFE is on the side of the throttle body and it has two vaccuum lines attached to it. Two screws hold it in place. If you replace it, it might not solve the problem. Remove the throttle body along with the EGR valve and there is probably tons of carbon build up. Try cleaning it and your problem might be solved. I worked for a Ford dealership for 4 years and we seen alot of this.. hope it works.
Digging up an old thread here, got this code tonight after replacing my egr valve, egr tube, vacuum pressure solenoid, and the dpfe sensor... I also have it tuned off with my sct tuner, no dice... Any ideas?
If the DPFE sensor has been replaced AND the vacuum lines to/from the DPFE sensor are connected correctly and leak free then the next thing to check is the electrical connector to the DPFE sensor. Try cleaning with electrically contact cleaner.
>> P1401 - DPF EGR Sensor Circuit High Voltage Detected
DPF EGR circuit open
VREF short to PWR
Damaged DPF EGR sensor
DPFEGR circuit short to PWR
SIG RTN circuit open
Note, the P1443 is an EVAP related DTC and NOT EGR.
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