If you’ve lost the key – and don’t have a spare – then you will need to contact an automotive locksmith or your local Renault dealer. An independent locksmith will all likelihood be your cheapest option - they will have the tools required to cut a new key and program it to pair up with the van’s security system. However, depending on how sophisticated your van's security system is, the costs could run into a couple of hundred pounds. Obviously, ensure you've searched everywhere for the lost key before paying out for a completely new set.