See also:

High outside temperatures
If DEF heats up to over 122 °F (50 °C ) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...

More operating comfort, better connectivity: new-generation telematics
The new Mercedes-Benz C-Class also sees the debut of a new telematics generation which will also be gradually introduced in other model series. Major new features include greater operating conveni ...

Unlocking and opening doors from inside
You can open a door from inside the vehicle even if it has been locked. You can only open the rear doors from inside the vehicle if they are not secured by the child-proof locks. Only open th ...