Divrter valve , please help :(

Hi, i have tfsi 2.0 engine: code BWA  , but i have problem with car, engine about 2000rpm random shuttering...

DTC error:

008801 - Boost Pressure Control Valve (N249)
P2261 - 008 - Mechanical Malfunction - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 2
Fault Frequency: 1
Reset counter: 255
Mileage: 139474 km
Time Indication: 0
Date: 2000.00.00
Time: 06:22:38

Freeze Frame:
RPM: 1834 /min
Load: 14.5 %
Speed: 37.0 km/h
Temperature: 72.0°C
Temperature: 6.0°C
Absolute Pres.: 990.0 mbar
Voltage: 14.478 V


Readiness: 0000 0000

I changed DV october 2013 to version G... i changed PCV,cam follower, N75 .... but error is randomly(error showing about low rpm 2000).. please help, where is problem? I think that this may be MAF sensor, or? thank you