The problem I had with one of my ignition keys losing its association to the vehicle BCU has been resolved. For those who may experience the same problem, perform the following CAREFULLY:
1. Open the ignition key fob and remove the circuit board and battery in one piece.
2. Write down the 6 characters printed on the chip on the underside of the circuit board.
If you have another working key, keep it handy with the non-working key
3. Start Nanocom and select the Valeo BCU tab
4. Select "Utility" from the left pane
5. Perform an RF test with the working key. A success message will be displayed stating the key number
6. Select “Key Inner Codes” from the left pane of Nanocom
7. Click “Update” to display the codes stored in the BCU
8, Enter the number from step 2 into any of the key fields, except the field which is the one for the working key identified in step 5
9. Click “Set Code” next to the field you just added the key number from the non-working key.
10. Click update and check the new number was written to the BCU
11. Perform the "Key Sync" function
12. Disconnect Nanocom and check that the key works
This can also be done to add new or replacement keys to the BCU. I must thank Nanocom Support for guidance with this process. Their Spanish to English translated instructions were not as clear as the instructions I have supplied above.


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