1. Oxygen Sensor:
- A faulty oxygen sensor can trigger the check engine light.
2. Catalytic Converter:
- Failing or inefficient catalytic converters can cause the check engine light to illuminate.
3. Mass Air Flow (MAF) Sensor:
- A MAF sensor that is dirty or malfunctioning can affect the air/fuel ratio and trigger the check engine light.
4. Spark Plugs and Ignition System:
- Worn-out spark plugs or issues in the ignition system, such as faulty spark plug wires or a failing ignition coil, can cause misfires and illuminate the check engine light.
5. Fuel System Problems:
- Issues in the fuel system, including a clogged fuel filter or faulty fuel injectors, can affect the proper functioning of the engine, causing the check engine light to turn on.
6. Coolant Temperature Sensor:
- A malfunctioning coolant temperature sensor might give incorrect readings about your engine's temperature, triggering the check engine light.
7. EVAP System Issues:
- Faults in the evaporative emission control (EVAP) system can cause the check engine light to come on.
It's important to identify the specific cause by connecting your vehicle to a scanner to read and interpret the diagnostic trouble codes (DTCs) stored in the car's computer. To ensure accurate diagnostics and repairs, consulting with a qualified mechanic or Mercedes specialist is recommended.
