What Does P0171 Mean on Your 2024 Lincoln Nautilus?
A P0171 code on your 2024 Lincoln Nautilus indicates the powertrain control module has detected a lean air-fuel ratio on Bank 1. The redesigned 2024 Nautilus is powered by a 2.0-liter turbocharged four-cylinder engine producing 250 horsepower. As an inline engine, Bank 1 is the only bank. The PCM is adding extra fuel to compensate for too much air in the combustion mixture.
Symptoms You Might Notice
- Check engine light illuminated
- Rough or shaky idle
- Hesitation during acceleration
- Fuel economy below the typical 24-30 MPG
- Reduced power response
- Subtle vibration at idle
Common Causes of P0171 on the 2024 Lincoln Nautilus
As a new model year, warranty coverage applies:
- Boost or Intake Leak (30% likelihood) — Factory assembly issues with turbo charge piping, intercooler connections, or intake gaskets.
- PCM Software Issue (30% likelihood) — Ford may have released calibration updates for the 2.0L EcoBoost fuel management system.
- MAF Sensor Problem (25% likelihood) — A contaminated or defective mass air flow sensor causing incorrect airflow readings.
- Fuel System Component (15% likelihood) — A weak fuel pump, faulty pressure sensor, or injector issue.
How to Diagnose the Problem
- Visit your Lincoln dealer — Under warranty, the dealer should diagnose and repair at no charge.
- Ask about TSBs — Technical Service Bulletins for the 2.0L EcoBoost and fuel trim issues may exist.
- Independent diagnosis — Use FORScan or an OBD-II scanner to check fuel trims and freeze frame data.
- Smoke test — Identifies hidden vacuum and boost leaks efficiently.
- Data analysis — Monitor MAF, fuel pressure, and O2 readings during driving.
Repair Options and Cost Breakdown
- Boost or intake leak repair: $150–$400. Should be warranty-covered.
- PCM software update: $0–$200. Free under warranty or TSB.
- MAF sensor replacement: $180–$350. Part cost $70–$160. Easy DIY if out of warranty.
- Fuel system repair: $500–$1,000. Covered under powertrain warranty.
Prevention Tips
- Use premium fuel as recommended by Lincoln
- Keep all scheduled service appointments
- Use Motorcraft-recommended fluids
- Report any performance changes to the dealer while under warranty
- Avoid aftermarket intake modifications
Warranty Coverage
Your 2024 Lincoln Nautilus is protected by a 4-year/50,000-mile bumper-to-bumper warranty and a 6-year/70,000-mile powertrain warranty. Engine and fuel system components causing P0171 should be repaired at no cost at any authorized Lincoln dealer.