2003 A4, 1.8t, USA, IMMO3

I used VAG CAN commander with a blue KKL cable to retrieve my SKC.  I then switch over to VCDS to verify - first in the 1-ENGINE section --> login accepted.  I then try the same SKC in the INSTRUMENTS section - login code not accepted by controller
Hmmm.  I would imagine the fact that the ECU was replaced by the previous owner of the car (at the dealership) may have something do to with this?  My ultimate question is: does this affect my ability to put in a used, MTM chipped ECU ?  Thanks in advance.

I have found that VAGEEPROMprogramer works great for pulling the cluster SKC if you want to find out what it is. Someone correct me if I'm wrong here but I'm pretty sure it depends on if the ECU you want to run already has IMMO defeated or not. If it hasn't been defeated you will either have to defeat it yourself, or adapt it to your cluster as a replacement ECU via VCDS following the procedure in the Ross Tech wiki. I would wait for confirmation from someone that knows for sure though I'm still pretty new to this and my answer could be way off base. Regardless; hope that helps 

its encrypted.....

set to new > read decrypted.