A P0302 code on your 2022 BMW 3 Series indicates the engine management system has detected misfires in cylinder 2. The G20/G21 3 Series uses the B48 2.0L turbo four-cylinder in 330i models or the B58 3.0L turbo inline-6 in M340i models. Each engine has specific diagnostic considerations.
2022 Engine Options
The B48 produces 255 horsepower from four turbocharged cylinders. The B58 delivers 382 horsepower from six turbocharged cylinders. Both use direct injection and can develop carbon buildup. Cylinder 2 is second from front on both inline configurations.
B48 Four-Cylinder Specifics
The 2.0L turbo experiences typical GDI issues including carbon buildup. Four-cylinder misfires are pronounced as each cylinder contributes 25% of power. Ignition and fuel system issues are primary causes. Boost pressure irregularities affect combustion.
B58 Six-Cylinder Considerations
The 3.0L inline-6 smoothness masks minor misfires somewhat. Carbon buildup affects intake valves over time. Higher power output stresses ignition components. The proven S58 variant in M3 has similar characteristics.
Symptom Recognition
Both engines display rough idle, vibration, and hesitation with misfires. The sport sedan's refined driving dynamics suffer. BMW's adaptive transmission may respond to reduced power. Check engine light accompanies the condition.
Diagnostic and Repair Approach
Identify engine type. Use BMW-compatible diagnostic equipment for detailed analysis. Inspect ignition components. Check boost system. Evaluate carbon buildup. Given the newer model year, warranty coverage should apply.