Freelander 2 (LR2) Power engine reduced

Power engine reduced,turbo is like new

i have a Freelander 2 HSE 2008 2.2 engine diesel 112KW with 147k km..and i m verry disapointed and dont know more what we can do…here is my problem
If the car stay still there is no problem at all,we can accelerate from 100rpm to 4000 rpm all day no problems at all but when i go with the car somewhere between 2000-3000 on automatic i receive power engine reduced,the gear is changing but i cant go far and i get power engine reduced..if i go on manual and pass over 3000 rpm lets say in 2 gear and with 3500 rpm is going ok …
first i receive p0131 error i changed with 0281004564 part no bosh o2 lambda sensor(i hope this one is ok because at the store they told me there are 2 sensors same thing one longer one shorter i mean the wire and i was buying the expensive one…)
the turbo i send it to specialists they changed all inside,test it all is ok
we dont know what to do more…
now i have 2 errors
P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
and p0299 turbo…but this one is like new…