Moin, I recently bought a 451 fortwo from 2010, mhd with 71 hp, currently 42.500 km. The little one is pretty good there and makes me very much fun. He should stay with me and I am currently doing everything possible for it. The start – stop technology was not revised according to previous owner, there was probably no recall. Maybe that’s because it is a re-import? Anyway, I will check that still in SC Aachen, but quite trust the information of the previous owner. What exactly was then improved or exchanged over time. Was that the holding bolt incl. a changed holder of the generator? With my is the tensioner with the “spring ” installed. Do I also need to exchange the one for a better one? Greeting, Stefan