Driving and operating 127If cleaning of the filter is required andprevious driving conditions did notenable automatic cleaning, it will beindicated by control indicator %3 87.% 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 the cleaning process,continue driving, keeping enginespeed above 2000 revolutions perminute. Shift down if necessary.Diesel particle filter cleaning is thenstarted.If control indicator Z illuminatesadditionally in the instrument clusterwhen the engine is running, theremay be a fault in the diesel particlefilter 3 84. Seek the assistance of aworkshop immediately.CautionIf the cleaning process isinterrupted, there is a risk ofprovoking severe engine damage.Cleaning takes place quickest at highengine speeds and loads.Do not switch off the engine until thecleaning process is complete. This isindicated by the extinguished controlindicator %.Catalytic converterThe catalytic converter reduces theamount of harmful substances in theexhaust gases.CautionFuel grades other than those listedon pages 3 142, 3 199 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 faultrectified by a workshop as soon aspossible. In an emergency, drivingcan be continued for a short period,keeping vehicle speed and enginespeed low.Malfunction indicator light 3 84.
