With this dongle it is possible to display the tank content in liters Suitable for the following vehicles C-Class series W204 E-Class series W212 E-Class Cabrio A204 Activation and deactivation via the diagnostic interface of your vehicle Simply connect the adapter to the vehicle's OBD interface - done! After successful coding, you will see the display of the tank content in liters in the menu of the instrument cluster. The function is not permanently activated, but can be reactivated at any time with the dongle Ex: 1st use = activate the display of the tank content in liters 2nd use = reset to factory setting (deactivate the display of the tank content in liters) 3rd use = activate the display of the tank content in liters 4. etc. Scope of delivery: 1x coding dongle Notes: The coding dongle can only be used for one vehicle