Hi, looking for any advice, my 2011 E350 cdi has developed an issue that on a long journey the engine light comes on the dash, it looses all power from the turbo but otherwise drives normally, if I pull over and turn the car off for a couple of minutes and turn it back on again it drives perfectly with the turbo working again, have had it to a Mercedes garage 3 times and each time it’s reading a different fault , puzzled

 

Assuming they addressed each fault properly and using MB diagnostics, curious what are the codes?