See also:

Tires
Problem Possible causes/consequences and Solutions USA only: The yellow tire pressure monitor warning lamp (pressure loss/malfunction) is lit. Canada only: ...

Please bear the following in mind
At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" sectio ...

Removing the mechanical key
Push release catch 1 in the direction of the arrow and at the same time, remove mechanical key 2 from the SmartKey. ...