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:

    Menu overview
    The number of menus shown depends on the optional equipment in the vehicle. 1 Standard display menu • tire pressure loss warning system (Canada only) • tire pressure monitor (USA only) • ASSYS ...

    Lights
    Switching the daytime running lamps on/off This function is not available in Canada. If you have activated the Daytime Running Lights function and the light switch is in the position, the dayti ...

    Range of the sensors
    General notes The sensors must be free of dirt, ice and slush; otherwise they may not function correctly. Clean the sensors regularly, taking care not to scratch or damage them. Side view ...