2013 a4 2.0TDI exhaust sensor problem

[Jonkers]

Hi, 2/3 of my a4’s temp sensors give out 0 value even after all 3 temp sensors have been changed. Only the one on the turbo works. The weird thing is that the 2 that don’t work now worked perfectly before i changed the turbo one. Now the one on the turbo works but the 2 other ones dont. I figured they went bad and i changed them both but they still read 0. It’s obvious the sensors aren’t the problem so what could it be? Thanks!