i have a C250, W204, 2011 model, and i noticed that the ECO mode is not working anymore. When i turn the car on, the ECO button light is green and the ECO sign appears in the cluster. After 1-2 min, the ECO sign dissapears from the cluster and the green light on the ECO button goes off. Even if you press the button nothing happens. Previously, you could press the button to enable ECO mode and the ECO sign appears in cluster. The sign in cluster was yellow if car could not meet criteria of ECO mode or Green if it was. Now, the button is dead. No Eco sign appears in cluster anymore. All criterias of Eco mode are met(a/c is off, engine temperature is OK,etc)
Any suggestions please?