PLease Please Please help

car is driving me nuts , the turbo went on the wifes megan 2 tin roof convertible, 1.9dci . so had turbo done , now car is not performing right , lack of power , also says check injection on dash . I have tried 4 different maf , no difference , have also tried 2 turbo pressure sensor , no difference , have changes the glow plugs as was told that it could also be them , even though car starts fine , if you unplug the maf then drive the car , it performs as it should do , but as soon as you plug back in , it is usless , I have tried the cheap maf and also 2 original mafs , . im now at my wits end





any help please