General information: Notes

All A4 from model year 2002 are equipped with Immobilizer Generation III.

Generation III has the same functionality as the previous version. However, in addition to the normal data exchange between the immobilizer control module and ignition key, Gen. III includes data exchange between the immobilizer control module and Engine Control Module (ECM).

The immobilizer control module is integrated into the instrument cluster, i.e. it is replaced together with instrument cluster → Instrument cluster, removing and installing .

Data exchange between the Immobilizer control module and ECM takes place over the vehicle CAN-Bus network.