Diesel particulate filter obstructed
Particle filter. See Owner's Manual
When the symbol lights up you can assist the self-cleaning function of the filter by driving accordingly. You should drive at a speed of at least 60 km/h (engine speed about 2,000 rpm) for about 15 minutes in 4th or 5th gear, or with the selector lever in position S on vehicles with automatic gearbox. As a result of the increase in temperature the soot in the filter will be burned off. The symbol will disappear once the cleaning process has been completed successfully.
If the symbol does not go out, please contact a qualified workshop and have the fault rectified.
For further information on the diesel particulate filter
It is essential that you adjust your speed to suit the weather, road, terrain and traffic conditions. The recommended driving speed must never lead to the driver disregarding the traffic regulations.