A P0303 diagnostic code on your 2024 Infiniti Q50 indicates the powertrain control module has detected repeated misfires in cylinder 3. The 2024 Q50 continues with the refined VR30 twin-turbocharged V6.
2024 Q50 Powertrain
The 2024 Q50's VR30DDTT 3.0L twin-turbo V6 is available in 300 hp or 400 hp (Red Sport) configurations. Cylinder 3 is on one bank of this V6.
Typical Causes
- Ignition Coil Problems: High boost levels stress ignition
- Spark Plug Condition: Turbo requires specific plugs
- Boost System Integrity: Leaks cause lean conditions
- Fuel Injector Issues: Direct injection deposits
- Carbon Deposits: GDI valve accumulation
Diagnostic Process
Use Infiniti diagnostic equipment for detailed access. Monitor boost and misfire data. Test ignition components systematically. Red Sport models require extra attention to high-boost components.
Repair Recommendations
Replace faulty ignition coils with OEM parts. Install properly specified spark plugs. Repair boost leaks. Professional carbon cleaning may be needed at higher mileages.