P1401 on Porsche
DPFE (Differential Pressure Feedback EGR) Sensor Circuit High Input
P1401 on Porsche vehicles indicates dpfe (differential pressure feedback egr) sensor circuit high input. Au7o has documented this code across 1 Porsche model — most commonly on Macan. 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. Typical repair costs on Porsche range from $400 to $2,500, depending on the specific model and root cause.
Common Causes of P1401
- •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)
P1401 on Porsche by Model
Porsche Macan(1 issue)
- Diesel 3.0 V6 TDI EGR/DPF Clogging and AdBlue Line Splitting (EU-spec)2014-2018
The EU-market Macan S Diesel (3.0 V6 TDI) is prone to EGR valve faults and diesel particulate filter (DPF) clogging, especially on cars used for short urban journeys that never complete a hot regeneration. EGR electrical faults can also block regen from running, compounding soot buildup. Additionally, the AdBlue (SCR) pipework at the rear of the engine bay splits, leaving crystallized AdBlue residue around the connectors and triggering emissions warnings. These are highly relevant to German/EU diesel owners; this engine was not sold in the US.
Looking for P1401 on a different make?
View P1401 across all makes →Frequently Asked Questions
What does P1401 mean on Porsche?▼
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. On Porsche specifically, this code is documented across 1 model.
What causes P1401 on Porsche vehicles?▼
Common causes on Porsche: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1401 on a Porsche?▼
Repair costs on Porsche range from $400 to $2,500, depending on the specific model and root cause.
Which Porsche models have P1401 documented?▼
Au7o has documented P1401 on 1 Porsche model: Macan.