The P0302 diagnostic code on your 2024 Subaru Forester indicates cylinder 2 is experiencing misfires detected by the engine control module. The sixth-generation Forester is powered by the 2.5L boxer four-cylinder producing 182 horsepower. This horizontally opposed engine with direct injection has specific characteristics for misfire diagnosis.
Boxer Engine Layout
Subaru's FB25D boxer engine positions cylinders horizontally opposed with cylinder 2 on the passenger (right) side. The direct injection system delivers fuel at high pressure directly into combustion chambers. This layout provides a low center of gravity but creates unique access considerations for service.
Common Misfire Causes
Direct injection carbon buildup can develop on intake valves since fuel doesn't wash over them. Ignition coil failure affects spark delivery. Spark plug wear or fouling—which can be influenced by the horizontal cylinder position—reduces ignition energy. Fuel injector problems affect cylinder-specific delivery.
Symptom Recognition
The boxer four-cylinder's distinctive sound changes noticeably with cylinder 2 misfiring. Rough idle, unusual vibration, and hesitation affect the compact SUV's driving experience. Check engine light illumination accompanies detected misfires.
Diagnostic Steps
Scan for all codes and freeze frame data. Access cylinder 2 on the passenger bank for inspection. Test ignition components. Borescope inspect intake valves for carbon. Test fuel injector operation. Compression testing verifies mechanical health.
Warranty Coverage
Your 2024 Forester is covered under Subaru's warranty. Document symptoms and have dealer diagnosis for proper coverage on new vehicles.