A P0303 code in your 2020 Nissan Murano indicates the engine control module has detected persistent misfires at cylinder 3. This stylish midsize crossover uses the proven 3.5L V6 engine producing 260 horsepower. Understanding the V6 configuration and common failure points ensures accurate diagnosis of this family-oriented vehicle.
Cylinder 3 Location
The 3.5L V6 positions cylinder 3 at the rear of the front bank (radiator side) in the traditional V6 layout. Cylinders 1-3 occupy one bank while 4-6 are on the other. This arrangement provides reasonable access for ignition system service.
Crossover Usage Patterns
The Murano serves as a family vehicle often used for daily commuting, school runs, and family trips. This varied driving pattern—including frequent short trips and occasional highway runs—creates specific wear patterns that differ from vehicles driven primarily on highways.
Common P0303 Causes at Four to Five Years
At this age, wear-related issues become more likely. Spark plug degradation affects ignition quality. Ignition coil failures occur from heat cycling. Fuel injector deposits build up affecting spray patterns. Intake manifold gasket leaks create vacuum imbalances.
VQ Series Reliability
Nissan's VQ-series V6 engines have an excellent reputation for reliability. The 3.5L variant has been refined over many years and is known for smooth, dependable operation when properly maintained.