When your 2022 BMW 3 Series displays the P0304 code, the engine control module has detected recurring misfires in cylinder 4. Understanding BMW's turbocharged engines enables targeted diagnosis for restoring this sport sedan's characteristic performance.
Understanding P0304 in the 2022 3 Series
The 2022 3 Series offers the B48 2.0L turbo four-cylinder (330i) and B58 3.0L turbo inline-six (M340i). Both engines use direct injection and turbocharging. For the four-cylinder, cylinder 4 is the rearmost position. For the six-cylinder, it's fourth from the front in the inline arrangement.
Turbo Engine Misfire Causes
BMW's turbocharged engines face elevated ignition demands from boosted pressures. Spark plug electrode wear accelerates under turbo conditions. Ignition coils must generate robust sparks. Direct injection allows carbon accumulation on intake valves over time—a characteristic BMW owners should monitor. Quality components are essential.
Diagnostic Methodology
Identify your engine configuration. Use BMW-compatible diagnostics for comprehensive data. Locate cylinder 4 based on your engine type. Test ignition coil output against BMW specifications. Inspect spark plug condition. Consider carbon buildup for vehicles with higher mileage or related symptoms.
Repair Implementation
Install BMW-approved spark plugs designed for turbocharged operation. Replace ignition coils showing degraded output. Address carbon accumulation through professional cleaning if indicated. BMW's performance character requires quality repairs.