Ask for advice!

Hello, since December last year I am (actually) a happy smart owner. Now comes the fat BUT: Actually since the beginning the Smart (used car, 40,000 km down, diesel) starts hard. However, he always jumped. For a month now it is the case that he runs out (if he starts) almost always directly again. In addition, the following problem has now come to mind: If I get the car, let’s go. The engine control light looks up and doesn’t go off again so quickly. That took more than 15 minutes. In time, the engine is then on, however, no gas. In addition, it should be mentioned: Sometimes it jumps directly on, sometimes it drains directly again, sometimes it jumps on and then the engine control light flashes up and thus no gas comes on. This is all so and so on. So relatively unreliable and unpredictable… For a week now my car has been standing at a Smart Werkst att and they still can’t say 100% where the error lies. They suspect either the controller(s) (I think they mean the alternator controller) or the turbo. Does any of you have similar problems or a guess what it might be? I’m really in despair so slowly… especially since this problem can’t be found in past forums I would be grateful for any post!!!