Hello, I have been owner of a 407 SW HDI 135 Biturbo since summer last year. Now it happened for the 3rd time (distance very irregular) that I saw smoke coming out of the engine room while stopping at a traffic light. Temperatures have all remained normal. At the next stop these had disappeared again. What could that be? Can someone help me. Will drive to the workshop again next week. Problem is only when I go there is certainly nothing. Thanks for your feedback. Greetings Kurti