Hello forum members, I’m new here and this is my first post. Since March 2017 a used Doblo (BJ 2009) is my own. It’s a dealer car. Since the exhaust system was heavily rusted before I took over the car, the complete exhaust pipe was replaced by a new one. It looked tipiop on the chopping day (new exhaust stop) I looked at the underbody again last WE and hit me. The middle part of the exhaust system (40cm) The exhaust pipe in front of and behind the coroded exhaust piece, however, look perfectly fine from the outside (steel paint). How is this possible? What would you do in such a situation? Is it useful to cut out the rusted 40cm piece (welded with the rest of the system) and replace it with a new pipe piece? I’m afraid to start to rust the two welded exhaust pipes in front and behind the rusted piece (if you Is the exchange of the corroding exhaust piece of economic nonsense? (the rusted pipe piece is still solid, fortunately) Say: Should I leave the plant like this and react first when it leaks and then replace the entire plant? Has anyone had any similar problems? I somehow suspect that the dealer has used a rusting pipe piece already inside. Or is this phenomenon to be explained differently? Maybe someone can help me. Photos follow immediately. Greetings Nebukatneza