And suddenly she was there for a few days and disappeared again as she had come. Just on time for Advent not only the fourth light was burning but also the yellow engine control light without otherwise having changed something at the running behavior. Unfortunately, she had no capacity to read out Mercedes Werkstatt. The ÖAMTC did not come in. The technician whispered some of the incompatibility of the engine control unit. In any case I drove around now a good week and yesterday the light went off Who’s got an idea?