A P0302 trouble code on your 2020 Nissan Rogue indicates the powertrain control module has detected misfires in cylinder 2. The 2020 Rogue, representing the second-generation model's final year, is powered by the 2.5L QR25DE four-cylinder engine producing 170 horsepower. This proven powerplant has specific characteristics that affect misfire diagnosis.
Understanding the QR25DE Engine
The 2.5L QR25DE is a naturally aspirated inline-4 with port fuel injection. Cylinder 2 is the second cylinder from the timing chain end. This engine has been used across many Nissan models, providing a well-understood diagnostic path. The relatively simple design lacks the complexity of turbocharged or direct-injection engines.
Common Causes of Cylinder 2 Misfire
Ignition coil failure is a leading cause, as the coil-on-plug design places electrical stress on each unit. Spark plug wear over time reduces ignition efficiency. Fuel injector clogging can affect fuel delivery to cylinder 2. Vacuum leaks near the intake manifold runner for cylinder 2 cause lean conditions. Compression loss from head gasket issues is less common but possible.
Recognizable Symptoms
The four-cylinder engine displays noticeable misfire symptoms including rough idle, hesitation during acceleration, reduced fuel economy, and engine vibration. The check engine light illuminates when misfires are detected. Severe misfires may cause the light to flash, indicating potential catalytic converter damage risk.
Diagnostic Steps
Scan for all diagnostic codes and review freeze frame data. Inspect the spark plug on cylinder 2 for wear, fouling, or improper gap. Test the ignition coil using a coil tester or swap method. Check fuel injector operation with a noid light and balance test. Verify no vacuum leaks exist near cylinder 2. Compression testing confirms cylinder integrity.
Repair Solutions
Replace spark plugs with NGK or Denso iridium plugs at proper intervals. Replace faulty ignition coils with quality units. Clean or replace clogged fuel injectors. Repair vacuum leaks using appropriate gaskets or sealant. Address any compression issues with head gasket replacement if diagnosed.