cheers for the info IT.
If the gearbox ecu had died would I still have a problem connecting to the main ecu ?? As I can connect to gearbox and engine and they both chuck faults about missing command from main ecu??
As to it being an audi only job to recode the immobiliser would noone else be ablto do this. From online research there are companies that will repair/rebuild/reflash the ecu's and my local 'audi approved' garage made no mention to this being an issue......
Also I've been thinking, would the differing part numbers for the ecu's just account for a different program installed?, so the physical circuit board itself is identical and the presence of a certain program denotes the part number??