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:

    Panic alarm
    •► To activate: press button 1 for at least one second. An alarm sounds and the exterior lighting flashes. •► To deactivate: press button 1 again. or •► Inse ...

    Headlamps fogged up on the inside
    The headlamps may fog up on the inside if there is high atmospheric humidity. •► Drive with the headlamps switched on. The level of moisture diminishes, depending on the length of the jour ...

    Releasing the parking lock manually
    In the event of an electrical malfunction, it is possible to release the selector lever lock manually to move it out of position P, e.g. if you wish to tow the vehicle away. Do not use any s ...