Dp0 automatic gearbox

[Janos1977]

Hi all!
I have a Renault grand scenic mk2 2.0 petrol automatic car.
The automatic gearbox changed a second hand one in one of the local garage (Hornchurch) , but now not getting the gears. The car start, on the dashboard is showing the correct gears(p, r, n, d).
What we need to check it? I'm not sure the mechanik is a Renault specialist...
The mechanik said need to reprograming. I don't know...
I wery appreciate any help!

Thanks
Janos