Hello, our H-1 (Prem. – Aut. – 02/2012 – 60 Tkm) makes a new (grinding ?) sound since the last inspection. It comes from below, in different short intervals, very quiet, best to hear between 40 and 60 km/h, silently immediately at the gas take away and reminds away of a steam locomotive (..tsch.tsch…tsch…). In the second step, of course, I drive into the workshop. But in the inner-city traffic the noise goes down easily. That brings nothing. and from you an idea what this could be or where I should still investigate myself. Greetings Rüdiger