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:

    Important safety notes
    If a tire pressure monitor system is installed, the vehicle's wheels have sensors that monitor the tire pressures in all four tires. The tire pressure monitor warns you when the pressure drops ...

    Selecting a radio station
    SIRIUS XM satellite radio acts like a normal radio. For more information on satellite radio operation, see the separate operating instructions. You can only change the waveband and store ...

    Deactivating cruise control
    There are several ways to deactivate cruise control: Briefly press the cruise control lever forwards 3. or Brake. Cruise control is automatically deactivated if: • you engage the electric ...