P0404 on Lincoln: How to Diagnose & Fix
Exhaust Gas Recirculation Circuit Range/Performance
1 Lincoln model · 1 documented issue · 1 critical
P0404 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. Ford's recall report says the EGR valve poppet head can detach, and owners may first notice weak acceleration, engine vibration, a no-start or a check engine light; the loss of motive power increases the 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
- Weak acceleration
- Engine vibration
- No-start condition
- Check engine light
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.
Sources for this issue (2)
P0404 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 P0404 mean on a Lincoln?
P0404 stands for "Exhaust Gas Recirculation Circuit Range/Performance." This code means the exhaust gas recirculation (EGR) system isn't performing within its expected range. The EGR valve routes a metered amount of exhaust gas back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer monitors the valve's actual position versus what it commanded. When the valve sticks, moves incorrectly, or the feedback doesn't match the command, P0404 sets. This can cause rough idle, hesitation, pinging, and increased emissions. On Lincoln it is documented across 1 model: Nautilus.
What are the most common causes of P0404?
The most common causes of P0404 are: Carbon buildup clogging the EGR valve or passages, Sticking or failed EGR valve, Faulty EGR position sensor, Corroded or loose EGR connector, Damaged or shorted EGR wiring, Vacuum leak or failed vacuum control (on vacuum-operated systems), Clogged EGR cooler or tubes, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0404 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.