A P0302 code on your 2023 Subaru Legacy indicates the engine control module has detected misfires in cylinder 2. The 2023 Legacy offers the 2.5L FB25D naturally aspirated boxer or the 2.4L FA24F turbocharged boxer. Understanding these horizontally opposed engines helps target diagnosis effectively.
Boxer Engine Options
Both engines are flat-four designs with cylinder 2 on the passenger bank. The 2.5L provides 182 horsepower with efficient operation. The 2.4L turbo delivers 260 horsepower with increased cylinder pressure. Direct injection is standard, requiring awareness of GDI maintenance needs.
Common Misfire Causes
Direct injection carbon buildup develops over time. Ignition coil degradation affects spark delivery. Spark plug wear reduces ignition energy. The turbo model adds boost pressure irregularities as potential causes. Fuel injector problems affect cylinder-specific delivery.
Symptom Identification
The boxer's distinctive sound changes with misfires. Rough idle, vibration, and hesitation affect the mid-size sedan's refined driving character. Check engine light accompanies detected misfires.
Diagnostic Process
Identify your engine type. Scan for all codes including boost codes on turbo. Access cylinder 2 on the passenger bank. Test ignition components. Borescope inspect intake valves. Test fuel system. Compression testing verifies health.
Repair Approach
Replace ignition components as needed. Address carbon buildup appropriately. Service fuel injectors if indicated. Given the newer model year, warranty coverage should apply to defect-related issues.