Adaptation of vehicle keys: Notes

If new or additional ignition keys are required, they must be adapted to the anti-theft immobilizer.
All ignition keys, including those that were previously authorized, must be re-adapted.
Especially when a key has been lost, all vehicle keys should be re-adapted, since this will render the lost key unauthorized for vehicle start.
If it is not possible to adapt all keys for some reason, i.e. during a trip, the customer must have this done later at his/her local Audi dealership.
The number of adapted keys is indicated after selecting the adaptation function (channel 21) and also in measuring value block 022.
Adaptation can be interrupted using the "C" button of the VAG 1551 scan tool.
Once a key is adapted, it is locked and cannot be adapted to another immobilizer system.

NOTE: Effective calendar date 03.11.2002, the immobilizer secret number is encoded for increased security. The encoded number is now 7-digits and is referred to as a "PIN" ("Personal Identification Number"). The associated process is also new. See ANTI-THEFT IMMOBILIZER ON BOARD DIAGNOSTIC (OBD), INITIATING .

CAUTION: VAG 1551 Dealer numbers are stored in the immobilizer control module when adapting ignition keys.