P0401 on Lincoln: How to Diagnose & Fix
Exhaust Gas Recirculation Flow Insufficient
1 Lincoln model · 1 documented issue · 1 critical
P0401 on Lincoln by model: symptoms, diagnosis and fix
Certain 2025 Lincoln Nautilus vehicles are part of Ford Motor Company's 26S10 recall. The exhaust gas recirculation (EGR) valve may fail, and the outcome NHTSA describes is an unexpected loss of drive power. Because the power loss can occur without warning, NHTSA cites an increased risk of a crash. The Nautilus is one of several 2025 Ford and Lincoln models in this single campaign, which totals 47,804 vehicles across all of them combined.
Common Symptoms
- Unexpected loss of drive power
How to Fix
There is no cost to you: a Lincoln dealer will replace the EGR valve free of charge under recall 26S10. Owner letters were mailed July 31, 2026. VINs in this campaign became searchable on March 4, 2026, so the fastest way to confirm your Nautilus is affected is to enter the VIN at nhtsa.gov/recalls. For help, call Ford/Lincoln customer service at 1-866-436-7332.
Find a Lincoln dealer
Choose to share your location for this search, or enter an area below. Your search location is sent to Google to find dealers.
Open Lincoln dealer map in Google Maps ↗Call to confirm they service Lincoln vehicles and check your VIN, recall eligibility, parts availability, and appointment options.
Sources for this issue (1)
P0401 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0401 mean on a Lincoln?
P0401 stands for "Exhaust Gas Recirculation Flow Insufficient." This code means the Exhaust Gas Recirculation (EGR) system is not flowing enough exhaust back into the engine. The EGR system recirculates a small amount of exhaust into the intake to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions; the computer has determined the actual flow is below what it commanded. The most common reason is carbon buildup clogging the EGR valve or its passages. You may notice pinging/knocking, rough idle, or a check engine light, and the car will fail emissions testing. On Lincoln it is documented across 1 model: Nautilus.
What are the most common causes of P0401?
The most common causes of P0401 are: Carbon buildup clogging the EGR valve or passages, Stuck or faulty EGR valve, Blocked or restricted EGR ports/tubes, Faulty EGR temperature or position sensor, Faulty DPFE/EGR pressure sensor (on applicable systems), Vacuum leak or failed vacuum control (vacuum-operated EGR), Wiring or connector problems at the EGR valve. The specific cause varies by vehicle.
How much does it cost to fix P0401 on a Lincoln?
Repair costs vary widely with the root cause and Lincoln model; each issue on this page carries its own estimate where one is published.
Looking for P0401 on a different make?
View P0401 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.