Hello, my 451 from 2008 has been having a problem with an excessive exhaust as well as the almost permanently glowing engine control light (because of the Lamda probe) and a resulting restless running behavior. Since the puff became louder and louder now, I wanted to have a look over my workshop. A clever employee then also found the problem (probably for both problems), and indeed on a “under an additional sheet” on a connection to the exhaust almost all around torn / open connection high to the fixing of the Lamda probe before KAT. To save costs he has welded this place, deleted the error of the MKL … and look, the car accelerates and drives not only quite differently, it drives compared to before almost silently 🙂 and the MKL is also out. So the assumption is obvious, that the crack caused both. Until yesterday, then it went on again. My question to you: Can you get some well-preserved puffs and if yes, what cost these?