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 fuel and the fuel tank
    Problem Possible causes/consequences and Solutions Fuel is leaking from the vehicle. Risk of explosion or fireThe fuel line or the fuel tank is defective. - Turn the S ...

    Correct use
    Observe the following information when using COMAND: • the safety notes in this manual • all road traffic regulations Work improperly carried out on electronic components or systems (e.g. ...

    The suspension: Excellent dynamics without compromising on comfort
    Supreme driving dynamics coupled with superlative ride comfort on long journeys were the terms of reference in developing the chassis for the new Coupé, whose design and functions are geare ...