A P0303 code in your 2024 Mercedes-Benz C-Class indicates the engine control module has detected persistent misfires at cylinder 3. The current W206 generation C-Class uses the M254 2.0L turbocharged four-cylinder with mild-hybrid technology (201-255 horsepower depending on variant). Understanding this advanced powertrain ensures accurate diagnosis.
Cylinder 3 in the M254 Engine
The M254 is an inline four-cylinder engine with cylinder 3 positioned third from the front. This transverse-mounted engine includes an integrated starter-generator for mild-hybrid functionality.
M254 Engine Technology
The M254 features a 48-volt mild-hybrid system, turbocharging, and direct injection. This sophisticated powertrain delivers smooth power while meeting strict emissions requirements.
New Vehicle Misfire Scenarios
Even brand-new Mercedes-Benz vehicles experience P0303 codes from manufacturing defects, fuel quality issues, or software calibration sensitivity.
Luxury Compact Standards
The C-Class sets standards for luxury compacts. Any misfire affects the refined driving experience expected from Mercedes-Benz.