So you transplanted the SKREEM, RFID chip in the key and the ECU? You are SURE the RFID in the key is there?
Anyway, I'm thinking that SKREEM, RFID chip can move from car to car together - but I'm not sure if that is really so.

And I'm not sure if there is anything else in the chain that you must transplant, but I don't THINK there is. Seems to me, this should have worked.

Waiting for someone who KNOWS to chime in...