P0299, P1461, P1462 FAULT CODES

First of all, greetings to everyone. My vehicle is a 407 1,6hdi 2008 model excuvite package. When I connect an obd device to my vehicle it gives these three error codes (p0299, p1461, p1462). When I talked to my master, he said that the turbo needs to be serviced. But there is no such situation as blowing oil in the turbo. What do you think I should do, I would appreciate it if you could help me.

Hello teacher. The first mistake is related to the turbo pressure, possibly the turbo solenoid valve or torn cracks in the hoses. other errors with the air conditioning pressure sensor either the sensor is defective or there is oxidation and non-contact in the socket or wiring.

Thank you very much for your answer, Sir. Then I guess I don't need to have a turbo maintenance because 4000km with oil change will now cost a lot of oil change and turbo maintenance. My teacher will have one more question and drew my attention. The socket, which I showed with the arrow in the picture on the link, is empty, so there is no cable connection. Is this a normal situation, what does this part do? Sorry, I don't understand car at all, so I'm asking https://hizliresim.com/wllYEW