When your 2020 Mercedes-Benz GLE displays the P0304 code, the engine control module has detected recurring misfires in cylinder 4. As the first year of the W167 generation with potential accumulated mileage, understanding both standard causes and wear-related factors helps target diagnosis.
Understanding P0304 in the 2020 GLE (W167)
The 2020 GLE W167 introduced Mercedes' latest luxury SUV platform with the M256 inline-six and V8 options. As first-year production with several years of service, these vehicles may show age-related wear patterns. Cylinder 4 location varies by engine configuration.
Age and First-Year Considerations
Vehicles from 2020 may approach standard maintenance intervals. First-year production sometimes reveals unique characteristics. Spark plugs may be approaching replacement. Carbon buildup accumulates progressively with direct injection engines.
Diagnostic Methodology
Review maintenance history. Use Mercedes-compatible diagnostics for comprehensive data. Identify your engine and locate cylinder 4. Test ignition coil output and spark plug condition. Consider carbon buildup inspection for higher-mileage vehicles.
Repair Solutions
Replace spark plugs if due or worn. Address carbon accumulation through professional cleaning. Replace degraded ignition coils. Quality components maintain Mercedes luxury character.