Why is the fault light on for the Mercedes-Benz C260L?

[McHaven]

The fault light on the Mercedes-Benz C260L may be due to fuel quality issues or engine carbon buildup. Possible reasons for the fault light illuminating in the Mercedes-Benz C260L include: Fuel quality issues: Poor or substandard fuel can damage the engine and lead to carbon buildup. Sensor problems: This includes issues with sensors such as the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake temperature sensor, and oxygen sensor. When these sensors are damaged, have poor contact, or experience signal interruptions, the car's ECU cannot accurately obtain engine data, triggering the engine fault light. Maintenance issues: Poor engine maintenance is the most common cause of the engine fault light coming on.