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Hi I'm Kevin when you try and start does engine crank ?
Ok and on your scan tool can you see live data ?
Can you read live data?
Vagcom will do this
You need to see if on the live you have any reading for engine speed
I understand this you need to view on live data on computer if the ecu is seeing any reading at all from engine speed
I cannot assist any further without this confirmation il opt out another tech may assist
Ok let me know if you have any reading