Engine speed sensor test G28

Hi,

I have replaced the engine speed sensor as I got a P0321 error, implausible signal, short to plus. I have changed the sensor with a new HAAS one, and had the ECU tested by ECUTesting ltd, and this came back as no fault found. I have checked the wiring for continuity and shorts to positive and ground and all checks out as expected. What I want to do now is test the old sensor I took out to see if it still good before I try changing it for an another new one from a different supplier. 

VCDS reports zero engine speed whilst cranking: (files attached) I'm pulling my hair out here.... help!

Car is 144,000 miles (due a cambelt) A3 S-Line 2.0TDI 3dr Quattro Engine is BMN and 170bhp

Saturday,22,June,2019,20:11:00:39744
VCDS Version: Release 17.1.3 (x64) Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 03G-906-018-BMN.clb
Control Module Part Number: 03G 906 018 DN    HW: 03G 906 018 DN
  Component and/or Version: R4 2.0l PPD1.2      1247
           Software Coding: 0000172
            Work Shop Code: WSC 00353 210 91454
                      VCID: 74E0079217206FE1FD-8020
1 Fault Found:

000801 - Engine Speed Sensor (G28) 
               P0321 - 006 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00010001
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 40
                    Mileage: 239340 km
                    Time Indication: 0
                    Date: 2018.04.25
                    Time: 01:30:42

             Freeze Frame:
                    RPM: 224 /min
                    Torque: 0.0 Nm
                    Speed: 0.0 km/h
                    Time: 0.00 s
                    Angle: 0.0 °
                    Bin. Bits: 00000000
                    Bin. Bits: 00000001

VCDS result 22-06-19.txt Log-KV56OFX.txt