Hiya I'm looking to buy a vivaro I've spoken to seller. He wasn't keen for me to get someone with a diagnostic test and plug it in with it being all electrical he was worried it would mess up. He has messaged me and said he had a friend plug it in and it's sent it haywire so I can't buy and take away today until his uncle comes with a proper machine and sorts it out . On advert it's just what im looking for 2014 model with averege mileage and a bit over my price range but not by much. Can anyone help. Is this dodgy?