The P0302 diagnostic code on your 2020 Nissan Pathfinder indicates that cylinder 2 is experiencing misfires detected by the engine control module. The fourth-generation Pathfinder is powered by the 3.5L VQ35DD V6 engine producing 284 horsepower. This direct-injection version of Nissan's legendary VQ V6 has specific diagnostic considerations for misfire conditions.
VQ35DD Engine Architecture
The 3.5L VQ35DD is a 60-degree V6 with cylinder 2 located on the rear bank (firewall side). This direct-injection variant of the VQ35 family includes high-pressure fuel injection directly into the combustion chamber. The DOHC design features variable valve timing on both intake and exhaust camshafts.
Causes of Cylinder 2 Misfire
Direct injection carbon buildup on intake valves affects airflow into cylinder 2. Ignition coil failure is common on VQ engines, especially with age and mileage. Spark plug wear reduces ignition energy. Fuel injector problems including clogging and electrical failure affect fuel delivery. The rear bank location makes cylinder 2 more susceptible to heat-related issues.
Recognizable Symptoms
V6 engine misfires produce noticeable symptoms including rough idle, vibration, and hesitation. The smooth character of the VQ engine becomes disrupted when cylinder 2 misfires. Reduced power and fuel economy accompany the check engine light illumination.
Diagnostic Process
Code scanning should include all stored codes and freeze frame data. Access to cylinder 2 spark plug and coil requires working around the intake manifold. Inspect ignition components for wear or failure. Test fuel injector operation and fuel pressure. Borescope inspection reveals carbon buildup extent. Compression testing verifies cylinder mechanical health.
Repair Solutions
Replace spark plugs with NGK iridium units specified for the VQ35DD. Replace faulty ignition coils with quality components. Carbon cleaning of intake valves may require walnut blasting or chemical treatment. Address fuel injector issues through cleaning or replacement. Rear bank access may require partial intake removal for thorough service.