When your 2020 BMW 5 Series displays the P0304 code, the engine control module has detected recurring misfires in cylinder 4. With potential for accumulated mileage, understanding both standard causes and wear-related factors helps target diagnosis for this executive sedan.
Understanding P0304 in the 2020 5 Series (G30)
The 2020 5 Series G30 offers various powertrains including the B48 2.0L turbo four-cylinder and B58 3.0L turbo inline-six. Cylinder 4 location varies by engine. With several years of service, these vehicles may approach standard maintenance intervals and show age-related wear patterns.
Age-Related Considerations
Vehicles from 2020 may be approaching spark plug replacement intervals. Ignition coils degrade from years of heat cycling. Carbon buildup on intake valves accumulates progressively with direct injection engines. Consider the vehicle's mileage and maintenance history in your diagnostic approach.
Diagnostic Methodology
Identify your engine type. Review available maintenance records. Use BMW-compatible diagnostics for comprehensive data. Inspect spark plug condition noting whether original. Test ignition coil output. Consider carbon buildup for vehicles showing related symptoms.
Repair Solutions
Replace spark plugs with BMW-specified components if due or worn. Address carbon accumulation through professional cleaning. Replace degraded ignition coils. Comprehensive service may be appropriate if maintenance history is incomplete.