The P0304 code in your 2024 Mercedes-Benz C-Class indicates the engine control module has detected persistent misfires in cylinder 4. The latest W206 generation features Mercedes' advanced turbocharged engines requiring proper diagnostic approach for effective repair while maintaining the sedan's refined character.
Understanding P0304 in the 2024 C-Class (W206)
The 2024 C-Class features the M254 2.0L turbocharged four-cylinder with integrated starter-generator technology in most variants. This inline-four positions cylinder 4 at the rearmost location near the firewall. Mercedes' advanced engine management identifies the specific misfiring cylinder through precise crankshaft monitoring.
Advanced Powertrain Considerations
The M254 engine incorporates sophisticated technology including 48V mild hybrid system and integrated starter-generator. Turbocharged operation demands robust ignition components. Direct injection contributes to carbon accumulation on intake valves over time. The premium character of the C-Class depends on smooth, refined engine operation.
Diagnostic Methodology
Use Mercedes-compatible diagnostics supporting W206 systems. Retrieve all codes including hybrid system faults if applicable. Locate cylinder 4 at the rear of the engine. Test ignition coil output and spark plug condition against Mercedes specifications. Verify fuel injector operation.
Repair Solutions
Install Mercedes-specified spark plugs designed for the M254 engine. Replace degraded ignition coils with genuine parts. Address fuel system concerns. New vehicle warranty should cover manufacturing defects. Quality components ensure proper Mercedes character.