P1401: DPFE (Differential Pressure Feedback EGR) Sensor Circuit High Input
3 vehicles · 2 makes · $50-$2,500 repair
Most Reported On
P1401 is an OBD-II diagnostic trouble code meaning “DPFE (Differential Pressure Feedback EGR) Sensor Circuit High Input.” A Ford/Lincoln/Mercury/Mazda manufacturer-specific code. The powertrain control module saw the differential pressure feedback EGR sensor signal above its maximum calibrated value, meaning the reported EGR flow signal is implausibly high. The engine may idle roughly, hesitate, or run hotter, and the vehicle will fail an emissions test. A useful check: on the plastic-bodied DPFE sensors, any at-rest signal voltage above roughly 1.2V points to a failed sensor. Other manufacturers assign P1401 to different faults (Hyundai, for example, uses it for a DMTL/EVAP performance fault), so match the code to the make before buying anything. This code is most commonly reported on 1997-2004 Ford F-150 (XL, XLT, Lariat, FX4, King Ranch), 2014-2018 Porsche Macan (Macan S Diesel), and 1996-1999 Ford Escort (LX, GT, SE, ZX2, Wagon), with repair costs ranging from $50 to $2,500.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1401 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
Vehicles Affected (3)
FAQ
What does P1401 mean?
P1401 stands for "DPFE (Differential Pressure Feedback EGR) Sensor Circuit High Input." A Ford/Lincoln/Mercury/Mazda manufacturer-specific code. The powertrain control module saw the differential pressure feedback EGR sensor signal above its maximum calibrated value, meaning the reported EGR flow signal is implausibly high. The engine may idle roughly, hesitate, or run hotter, and the vehicle will fail an emissions test. A useful check: on the plastic-bodied DPFE sensors, any at-rest signal voltage above roughly 1.2V points to a failed sensor. Other manufacturers assign P1401 to different faults (Hyundai, for example, uses it for a DMTL/EVAP performance fault), so match the code to the make before buying anything.
What are the most common causes of P1401?
The most common causes of P1401 are: Failed DPFE sensor (a very common wear item on these vehicles), Cracked, collapsed, melted, or disconnected rubber hoses between the DPFE sensor and the EGR tube, Clogged or corroded EGR tube restricting flow, Open or shorted DPFE signal wiring, or a short to voltage, Corroded or oil-saturated DPFE connector, Failed EGR valve, EGR vacuum regulator solenoid, or PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P1401?
Repair costs for P1401 range from $50 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P1401?
Au7o has documented P1401 across 3 vehicle models from 2 manufacturers: Ford, Porsche.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.