A P0303 diagnostic code on your 2024 Lincoln Navigator indicates the powertrain control module has detected repeated misfires in cylinder 3. The flagship SUV continues with the refined 3.5L twin-turbo EcoBoost V6.
2024 Navigator Powertrain
The 2024 Navigator's 3.5L EcoBoost V6 produces 440 horsepower with twin turbochargers and direct injection. Cylinder 3 is on one bank of the V6. The high-output turbo system demands reliable ignition.
Typical Causes
- Ignition Coil Problems: High boost stresses ignition components
- Spark Plug Condition: EcoBoost requires specific plugs
- Boost System Integrity: Leaks cause lean misfires
- Fuel Injector Issues: Direct injection deposits
- Carbon Accumulation: GDI valve deposits
Diagnostic Process
Use Ford diagnostics for detailed EcoBoost access. Monitor boost pressure and misfire data. Test ignition components systematically. Check for TSBs on the current platform.
Repair Recommendations
Replace faulty ignition coils with Motorcraft parts. Install Ford-specified spark plugs. Repair boost leaks. Dealer service ensures warranty coverage.