When your 2024 Infiniti QX60 displays the P0303 code, the powertrain control module has identified consistent misfires in cylinder 3. The 2024 QX60 continues with the refined VQ35DD 3.5L V6 engine.
2024 QX60 Powertrain
The 2024 QX60's VQ35DD 3.5L V6 produces 295 horsepower with direct fuel injection and 9-speed automatic transmission. Cylinder 3 is on the front bank of the V6.
Typical Causes
- Ignition Coil Problems: Coil-on-plug failures from heat and age
- Spark Plug Condition: Iridium plugs wear over time
- Fuel Injector Issues: Direct injection deposits
- Carbon Deposits: GDI valve accumulation
- Intake System Leaks: Manifold or gasket failures
Diagnostic Process
Use Infiniti diagnostic equipment for detailed access. Monitor misfire counts and fuel trim values. Test ignition components through swap testing. Check for applicable TSBs.
Repair Recommendations
Replace faulty ignition coils with OEM-spec parts. Install Infiniti-specified spark plugs. Address fuel injector cleaning as needed. Dealer service ensures warranty coverage.