The P0304 code in your 2020 Nissan Murano indicates the engine control module has detected persistent misfires in cylinder 4. The Murano's refined 3.5L V6 requires proper diagnostic approach to address this combustion problem while maintaining the smooth character expected from this premium crossover.
Understanding P0304 in the 2020 Murano
The 2020 Murano features the 3.5L VQ-series V6 producing 260 horsepower through variable valve timing. This transverse-mounted V6 positions cylinder 4 on the rear bank toward the firewall. Nissan's engine management monitors crankshaft velocity to identify the specific cylinder experiencing combustion irregularities.
Common Misfire Causes
The naturally aspirated V6 faces standard ignition wear patterns over time. Spark plug electrode erosion affects ignition quality. Ignition coils degrade from heat cycling. Direct fuel injection creates conditions for carbon accumulation on intake valves. Fuel injector spray patterns affect combustion efficiency and the smooth power delivery expected from this premium vehicle.
Diagnostic Process
Retrieve all codes and analyze freeze frame conditions when misfires occurred. Access the rear bank for cylinder 4 inspection—the crossover's engine bay layout may require removing intake components. Test ignition coil output and spark plug condition. Verify fuel injector operation. Consider carbon buildup for higher-mileage vehicles.
Repair Solutions
Install Nissan-specified spark plugs for the 3.5L V6. Replace ignition coils showing degraded output. Address fuel system concerns through cleaning or component replacement. Professional carbon cleaning benefits vehicles showing intake valve deposit symptoms.