See also:

Lowering the vehicle
– Place the ratchet wrench onto the hexagon nut of the jack so that the letters AB are visible. – Turn the ratchet wrench until the vehicle is once again standing firmly on the ground. – Place ...

The windshield wipers are inoperative
The windshield wiper drive is malfunctioning. Select another wiper speed on the combination switch. Have the windshield wipers checked at a qualified specialist workshop. ...

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 wo ...