Hi, you may not believe it, but the game goes on. I finally found the squeaking, at least I believe it. I bought the book and immediately after I read that the Krafstoff is warmed up at the 85kw TDDI somehow went in that direction. Unfortunately it was always too warm or the noise was too short. Today it was different, at least the sound long enough….and I stood with a vacuum cleaner pipe in front of the car to listen. Directly on the Reg elventil of the diesel filter was a climper/kling/klapper VERY clear to hear. At the moment it is so that up to ~12°C outside temperature the noise is there and after a few minutes completely disappears. After I have heard the on/at the control valve the car probably ran for too long and it was not heard any more while the rest of the ride. What cost should it be, such an exchange of the control valve with wires? My wife and I will look/hear it again tomorrow (today it is e the car will no longer squeak). However, I am more than sure that this bright sound NIGHT belongs to the control valve. MFG