This is a repair service for Mercedes Benz Vito W447 FBS4 electronic ignition switch, also known as EIS/EZS unit. You will need to remove and send us your ignition unit and we will diagnose and repair any fault you may have with it. We will need you to also send all keys you have for the vehicle with the unit. No need to replace your EIS at a great cost, we can save you money. One of the most common faults is that the EIS no longer recognizes the key, this prevents the dash illuminating and the engine starting. Modules Covered under this repair service: Meredes Vito W447 2015 + FBS4