Wanted to ask in this way: in our Smart 453 family (me, wife, neighbor) the phenomenon accumulates in the last weeks and months that the tyre pressure control suddenly comes to the floor. Was once again also, especially after tyre change Winter/Summer vice versa, but after reset everything again well (well with tyre service slurled). Last but not more only reset, but really pressure loss. Mostly on all 4 tires, totally different without pattern front/back n and partly significant: in my case about 2 weeks ago, the rear was left instead of 2.5 only 1.6 bar!! No tire / rim damage visible, after pumping up until now everything is good again. Before the front left marked, rest zw 0.2-0.5 bar pressure drop. So really no pattern recognizable, which would then indicate a damage. As said, with the woman and with the neighbor as well!?? My guess: Red pin at the valves, Mercedes and its shareholders must be supported more in these hard Z Do you have similar experiences or do we just have bad luck? Say hello to Tony