Help ECU issue allroad 2004 2,5tdi
 

Help I have had issue with failure of ECU (bad Flasing ) in my Allroad:mad::confused:
It is a 2.5tdi 2004 BAU engine
Is there an issue using an ECU with the same part number to get started
As have got one out of another Allroad same year but numbers are a little different and will not start
Immobiliser light is off (not flashing on to start goes out )
Have now got second on way with fully matching numbers just is there any issues ?
Thanks for any help john