Investigating the P0100 Code on Your 2024 Mercedes-Benz C-Class
A P0100 code on your 2024 Mercedes-Benz C-Class (W206) indicates the engine control unit (ECU) has detected a mass airflow (MAF) sensor circuit malfunction. Your C-Class's M254 2.0-liter turbocharged four-cylinder with integrated starter-generator (ISG) mild hybrid system requires precise airflow measurements for optimal powertrain management. Since your vehicle is under full warranty, Mercedes-Benz dealer service is the recommended path.
Understanding P0100 on the W206 C-Class
The P0100 code means the MAF sensor signal is erratic, intermittent, or outside expected parameters. On the M254 engine, the MAF sensor works in coordination with the turbocharger, mild hybrid system, and advanced engine management to deliver both performance and efficiency. Unreliable MAF data disrupts this sophisticated balance.
Common Symptoms
- Check engine light illuminated (yellow engine icon)
- Reduced power warning on the MBUX display
- Rough or unsteady idle
- Sluggish turbo and EQ Boost response
- Decreased fuel economy
- Hesitation during acceleration
- Possible limp mode with limited power
Top Causes Ranked by Likelihood
- MAF sensor contamination (30-35%) — Oil vapor from crankcase ventilation or environmental contaminants on the hot-film element
- Charge air system issue (20-25%) — Leak or defect in the turbo intercooler piping
- Air filter or intake housing issue (15-20%) — Damaged or improperly seated filter element
- Wiring or connector fault (10-15%) — Loose or defective electrical connection at the MAF sensor
- MAF sensor failure (10-15%) — Internal component defect
- ECU software calibration (5-10%) — Software update for sensor parameters or mild hybrid coordination
Mercedes-Benz Warranty Coverage
Your 2024 C-Class is fully protected under Mercedes-Benz's 4-year/50,000-mile New Vehicle Limited Warranty through 2028. The MAF sensor and all related components are covered. The federal emissions warranty adds 8-year/80,000-mile protection. There should be zero out-of-pocket cost for this repair.
Schedule a service appointment through the Mercedes me app or contact your Mercedes-Benz dealer. The technician will use Mercedes' XENTRY diagnostic system — the brand's proprietary tool — to read detailed fault codes, analyze live sensor data, and check for applicable software updates or technical campaigns.
Mild Hybrid System Interaction
The M254 engine's integrated starter-generator and 48V mild hybrid system (EQ Boost) relies on accurate engine load data, which is partly derived from MAF sensor readings. A P0100 code may cause the EQ Boost system to reduce its assistance or deactivate entirely, affecting low-end torque and the engine auto-start/stop function. Mention any EQ Boost irregularities to your dealer.
Estimated Costs (Reference Only)
- MAF sensor replacement: $250-500 (OEM part) + $120-200 (labor)
- All covered under warranty on 2024 models