The P0302 diagnostic code on your 2024 Mercedes-Benz C-Class indicates cylinder 2 is experiencing misfires detected by the engine control module. The W206 C-Class features the M254 2.0L turbocharged four-cylinder with 48-volt mild hybrid technology in C300 models. This advanced powertrain has specific characteristics for misfire diagnosis.
M254 Engine Technology
The M254 produces 255 horsepower with integrated starter-generator providing mild hybrid assistance. Cylinder 2 is positioned second from the timing end of this inline-4. Direct injection operates at extremely high pressures. The mild hybrid system adds electrical complexity but doesn't directly cause engine misfires.
Potential Misfire Causes
As a new model, component defects are more likely than wear-related issues. Manufacturing variations in ignition coils, spark plugs, or fuel injectors can cause misfires. Software calibration issues occasionally affect specific cylinders. High-pressure fuel system irregularities can also cause misfire conditions.
Symptom Recognition
The compact sedan displays rough idle, vibration, and hesitation with misfires. Mercedes-Benz's smooth four-cylinder character is compromised. The ISG mild hybrid may mask some low-speed symptoms. Check engine light accompanies the condition.
Diagnostic Steps
Use Mercedes-Benz Star Diagnostic or compatible equipment for detailed analysis. Inspect ignition components for defects. Verify fuel system operation. Check for software updates. Dealer diagnosis ensures warranty coverage.
Warranty Coverage
Your 2024 C-Class is fully covered under Mercedes-Benz's warranty. Document symptoms and have dealer diagnosis for proper coverage.