The P0304 code in your 2020 BMW X3 indicates the engine management system has detected persistent misfires in cylinder 4. With potential accumulated mileage, understanding both standard causes and wear-related factors helps target diagnosis for this popular luxury SUV.
Understanding P0304 in the 2020 X3 (G01)
The 2020 X3 G01 offers the B48 2.0L turbo four-cylinder and B58 3.0L turbo inline-six. With several years of service, these vehicles may approach standard maintenance intervals. Cylinder 4 location varies by engine configuration.
Age-Related Considerations
Vehicles from 2020 may be approaching spark plug replacement intervals. Ignition coils degrade from years of thermal cycling. Carbon buildup on intake valves accumulates progressively—this is a known characteristic of BMW's direct injection engines requiring periodic attention.
Diagnostic Process
Identify your engine type. Review available maintenance records. Use BMW-compatible diagnostics for comprehensive data. Inspect spark plug condition noting age and mileage. Test ignition coil output. Carbon buildup inspection benefits higher-mileage vehicles.
Repair Solutions
Replace spark plugs if due or worn. Address carbon accumulation through walnut blasting if indicated. Replace degraded ignition coils. BMW's performance character requires quality components and repairs.