DPF pressure sensor "negative value" P0471

Greetings! I own a Skoda Fabia Greenline 2008 model, BMS engine - just had my DPF flushed with Toralin dpf cleaner and replaced the pressure sensor to a new one which has been confirmed to me that it is the right part number after checking an double checking and after adaptation/calibration I get a negative value ...once in a while I do get the P0471 error code like once a week and the engine light comes on, I guess due to the negative value as I understand it, the pressure sensor measures between 0 - 100 ?

Please see below, any suggestions as to why and how to fix it would be very appreciated ! Thank you!

                Address 01: Engine       Labels: 045-906-013-BMS.clb
Control Module Part Number: 045 906 013 Q    HW: 045 906 013 E
  Component and/or Version: R3 1,4L EDC G000SG  2592
           Software Coding: 0003071
            Work Shop Code: WSC 15937 159 999999
                      VCID: 1D36415BC7A269D656-5000
1 Fault Found:

001137 - Exhaust Pressure Sensor 1 (G450)
               P0471 - 000 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 260191 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 882 /min
                    Speed: 0.0 km/h
                    (no units): -43.35
                    (no units): -15.30
                    Mass Flow: 5.69 g/s
                    Temperature: 120.0°C
                    Temperature: 35.1°C


Readiness: 0 0 0 0 1
Tuesday,11,October,2016,13:07:59:05031
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 15.7.1.0 (x64)
Data version: 20150904
www.Ross-Tech.com


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                Address 01: Engine  (045 906 013 Q)

13:07:53
  -33.15   Press. Difference Particle Filter
  -30.60   Press. Difference Offset
  11.5 %   Particle Filter Load Coefficient
  31.0   Particle Filter Carbon Mass
  0.0   Carbon Mass Learned Value