The P0302 trouble code on your 2020 BMW 5 Series indicates that cylinder 2 is experiencing misfires detected by the engine management system. The G30/G31 5 Series uses the B48 2.0L turbo or B58 3.0L turbo engines. These direct-injection turbocharged engines have well-documented diagnostic characteristics.
2020 Engine Platform
The 2020 5 Series represents a mid-cycle refresh with proven engine technology. The B48 delivers 248 horsepower while the B58 produces 335 horsepower. Both inline engines position cylinder 2 second from the timing end. Direct injection and turbocharging create specific maintenance requirements.
Common Misfire Causes
By 2020 mileage, carbon buildup on intake valves may require attention. Ignition coil degradation from heat and age affects spark delivery. Spark plug wear reduces ignition energy under boost. High-pressure fuel system components may show wear. Boost system leaks can develop over time.
Diagnostic Considerations
The 2020 model year is approaching higher mileage where GDI carbon issues become prevalent. Comprehensive diagnosis should include ignition system evaluation, fuel system testing, and intake valve inspection. BMW-specific diagnostic equipment provides detailed misfire analysis.
Symptom Recognition
The executive sedan displays rough idle, vibration, and hesitation with misfires. BMW's smooth driving character is compromised. Check engine light accompanies detected misfires.
Repair Solutions
Replace spark plugs with BMW-specified units. Replace ignition coils as needed. Clean intake valve carbon through walnut blasting. Service fuel system components. Address boost leaks discovered during diagnosis.