help with turbo? P2565, P2563

Hi,

I recently bought car 2.0 HDI 136hp, RHR 2004, with Turbo problem.

When i start car turbo gives normal boost, after some driving i loose boost at all, until i start it again and again i have boost. Looks like limp/safe mode.

Diagnostic say:

when i clear all errors and start engine, in few seconds after car starts:
P2565 - Turbocharger Boost Control Position Sensor Circuit High

and when i loose boost i get:
P2563 - Turbocharger Boost Control Position Sensor Circuit Range/Performance


I changed all vacuum lines from vacuum pump to turbo.
I open vacuum turbo solenoid and clear it inside.
Wastegate is moving on vacuum, not sure does it loose vacuum.
I sprayed with WD40 all connections, including connection to TBCPS.

Also i tried to connect vacuum directly from pump to wastegate, bypassing solenoid, and i have boost all time i drive, but on low rpm i have some breaks i f i do that.


I think that i loose boost when i drive on low rpm, if i drive on full gas i think that i am not loosing boost, but i didn't drive like that long time.

On boost gauge i got maximum about 15.9 psi, if i connect vacuum directly to wastegate boost is 21.6 on max load.
When i loose boost, it is max 3-4psi

Can you help me to solve this?

I still can't go to mechanical.