i have a P2632 fault cod in my Mercedes

Question

Hi there,i have a Mercedes-Benz, e class, 220 cdi (diesel) 53plate number

few times i had some problem with the car when i as driving down in motorways, seems to be a boost pressure or sensor boost pressure, im not sue about it, but i have a diagnostic fault code for it which is P2632

let me tell u a little about how the problem occur, i was driving in fourth gear in about 2000rmp and the car was driving fine, i then wanted to change gear to a higher gear as i did so i wanted to accelerate but there was no boost or anything the car was doing same speed with the foot flooring down, this happen to me while i was on motor was and trying to go faster.

i then checked the car with the fault code reader and i found this 2 readings ith this notes with i hardly know that they are as they are written in German term

P2632
1)Exhaust gas pressure sensor/turbocharger (TC) boost pressure actuator boost pressure fault.
2)exhaust gas pressure sensor turbocharger (TC) boost pressure actuator

P1630 Drive Authorization Signal

I think that the first problem causes the second one so im not very worried about the second fault code

could you please explain to me in English term what the fist code means
Thank you very much