The P0304 code in your 2024 Mercedes-Benz E-Class indicates the engine control module has detected persistent misfires in cylinder 4. The completely redesigned W214 generation features Mercedes' latest powertrain technology requiring updated diagnostic understanding for this executive sedan.
Understanding P0304 in the 2024 E-Class (W214)
The redesigned 2024 E-Class W214 offers multiple powertrains including the M254 2.0L turbo four-cylinder and M256 3.0L turbo inline-six with mild hybrid technology. Cylinder 4 location varies—rear on the four-cylinder, fourth position on the six-cylinder. Each configuration presents specific diagnostic considerations.
New Platform Considerations
First-year redesigned vehicles may reveal characteristics as miles accumulate. The W214 incorporates Mercedes' latest engine and hybrid technology. Monitor for technical service bulletins. Standard ignition and fuel causes remain primary P0304 sources regardless of platform newness.
Diagnostic Methodology
Identify your specific powertrain. Use current Mercedes diagnostics supporting W214. For mild hybrid variants, check for related system faults. Locate cylinder 4 appropriate to your engine. Test ignition coil output and spark plug condition.
Repair Solutions
Install Mercedes-specified spark plugs for your engine type. New vehicle warranty should cover manufacturing defects. Replace degraded ignition coils with genuine parts. The E-Class executive character requires quality repairs.