Installing the radio in a Mercedes Viano 2.2 CDI from 2014 is technically possible, as the radio has a 2-DIN format. However, you may need a special fitting kit to adapt it to the existing gap in the dashboard. Such a kit should convert the non-DIN sized opening into a DIN sized one to easily fit the radio. It is advisable to consult a professional for the installation to ensure that all connections are correct and the radio works properly.