Lonsdor K518ISE auto key programmer successfully program a smart key on an Audi Q7 post 2009 by OBD. Same procedure goes to Audi A6/A6L.
Step 1: Read Immo data
Connect K518ISE host with vehicle via diagnostic socket
Select Immobilizer->Audi->A6L->2009 up->Immobilization
Turn ignition switch to ON position
Lonsdor K518 host yellow indicator flashes
Reading immo data
Step 2: Program Key
Follow Lonsdor K518ISE key programmer instruction to insert key and turn ignition ON
After all keys have been replaced, click OK to finish key learning.
Program key success.