Purity

Assuring the purity of DEF is particularly important with respect to avoiding malfunctions in the exhaust gas aftertreatment system.

If DEF is pumped out of the DEF tank, e.g.

during repair work, it must not be returned to the tank. The purity of the fluid can no longer be guaranteed.

Impurities in DEF (e.g. due to other Impurities in DEF (e.g. due to other service products, cleaning agents or dust) lead to:
- increased emission values
- damage to the catalytic converter
- engine damage
- malfunctions in the BlueTEC exhaust gas aftertreatment system

    See also:

    Problems with the transmission
    Problem Possible causes/consequences and Solutions The transmission has problems shifting gear. The transmission is losing oil. - Have the transmission checked at a qualif ...

    Opening
    You can open the tailgate automatically using the SmartKey or the handle in the tailgate. - Press and hold the button on the SmartKey until the tailgate opens. or - When the tailgate is unl ...

    Guide lines in the COMAND display
    WARNING   Use of rear view camera can be dangerous if you are color-blind or have impaired color vision. Only use rear view camera if you can see and distinguish all colored guidelines ...