Driving and operating 133take up to 25 minutes. Typically itneeds between 7 and 12 minutes.Autostop is not available and fuelconsumption may be higher duringthis period. The emission of smellsand smoke during this process isnormal.Under certain driving conditions, e.g.short distances, the system cannotclean itself automatically.If the cleaning of the filter is requiredand if previous driving conditions didnot enable automatic cleaning, it willbe indicated by the control indicator%. Simultaneously Diesel partic. filteris full continue driving or warningcode 55 appears in the DriverInformation Centre.% illuminates when diesel particlefilter is full. Start cleaning process assoon as possible.% flashes when diesel particle filterhas reached the maximum fillinglevel. Start cleaning processimmediately to avoid damage to theengine.Cleaning processTo activate cleaning process,continue driving, keeping enginespeed above 2000 revolutions perminute. Shift down if necessary.Diesel particle filter cleaning is thenstarted.If g illuminates additionally,cleaning is not possible, seek theassistance of a workshop.CautionIf the cleaning process isinterrupted, there is a risk ofprovoking severe engine damage.Cleaning takes place quickest at highengine speeds and loads.The control indicator % extinguishesas soon as the self-cleaningoperation is complete.Catalytic converterThe catalytic converter reduces theamount of harmful substances in theexhaust gases.CautionFuel grades other than those listedon pages 3 147, 3 210 coulddamage the catalytic converter orelectronic components.Unburnt petrol will overheat anddamage the catalytic converter.Therefore avoid excessive use ofthe starter, running the fuel tankdry and starting the engine bypushing or towing.In the event of misfiring, unevenengine running, a reduction in engineperformance or other unusualproblems, have the cause of the fault
