A P0302 code on your 2022 Subaru Impreza indicates the engine control module has detected misfires in cylinder 2. The fifth-generation Impreza continues with the 2.0L FB20D boxer four-cylinder producing 152 horsepower. Understanding Subaru's horizontally opposed engine design helps target diagnosis effectively.
FB20D Engine Configuration
The 2.0L boxer positions cylinders horizontally opposed with cylinder 2 on the passenger bank. Direct injection delivers efficient fuel management. The flat-four's balanced operation provides smooth performance when all cylinders contribute properly. Access differs from conventional inline configurations.
Common Misfire Causes
Direct injection carbon buildup develops on intake valves over time. Ignition coil degradation affects spark delivery. Spark plug fouling can occur influenced by the horizontal cylinder position. Fuel injector problems affect cylinder-specific delivery.
Symptom Identification
The boxer engine's distinctive sound changes with misfires. Rough idle, unusual vibration patterns, and hesitation affect the compact car's driving experience. Check engine light accompanies detected misfires.
Diagnostic Process
Scan for all codes and freeze frame data. Access cylinder 2 on the passenger bank. Test ignition components. Borescope inspect intake valves for carbon. Test fuel injector operation. Compression testing verifies mechanical health.
Repair Approach
Replace ignition components as needed. Address carbon buildup through appropriate methods. Service fuel injectors if indicated. Given the newer model year, warranty coverage should apply to defect-related issues.