Immobilizer Generation 3
Many 2002 and newer Model Year vehicles sold in the North American Region (NAR) have Immobilizer 3 and there are other Rest of World (RoW) Vehicles with Immobilizer 3 as well. Use VCDS to Select the Instrument Cluster (or Address 25 - Immobilizer in Vehicles with a separate Immobilizer Control Module) and look in the Extra Field. You should see BOTH a 14 digit Immobilizer ID number and ALSO a 17 digit VIN number in the Extra fields like this: WVZKB58001H231169 VWZ7Z0W0648696. The first 17-digit string is the VIN and the second 14-digit string in the Immobilizer ID. Keys that have been previously matched to a different Immobilizer 3 System cannot be reused with another one (which has a different Immobilizer ID). In some cases, you'll need to check in the Engine Control Module in Measuring Value Block (MVB) 081 to see the VIN and Immobilizer ID. If in doubt, check the Factory Repair Manual for your specific vehicle.
Key Matching (through Instrument Cluster)
Key Matching (through separate Control Module)
Key Matching (through Kessy)
Engine Control Unit (ECU) Swapping
Injection Pump Swapping (V6 TDI only)
Immobilizer Control Module Swapping (integrated in Instrument Cluster)
Immobilizer III Immobilizer Swapping (Separate)|Immobilizer Control Module Swapping (integrated in separate Control Module)
Immobilizer Control Module Swapping (integrated in Kessy)
Immobilizer III Measuring Blocks (Ross-Tech Website)
Immobilizer Generation 4
Many newer cars including all of the Golf/Jetta (1K) Models use Immobilizer 4. There are different varieties of Immobilizer 4 Implementations, some of them don't show a 14-digit Immo-ID anywhere, but rather a "Challenge" Value in Advanced ID. This Challenge changes every Time Terminal 15 (Ignition) is cycled.
As a general rule, VW models using Immo 4A (with Adaptation) may have Serial Numbers that contain VWZ (for Example VWZ7Z0G7051888). VW models using VWX (for Example VWX7Z0G7051888) "or ones without a Serial Number shown at all, do not use Adaptation and will have the revolving "Challenge" Value in Advanced ID. Those systems using a Challenge Value are not considered supported at this time. This means with challenge systems, VCDS cannot perform ANY of the procedures listed below:
Key Matching
Engine Control Unit (ECU) Swapping
Immobilizer Control Module Swapping (integrated in Instrument Cluster)
Immobilizer IV Immobilizer Swapping (Kessy)|Immobilizer Control Module Swapping (integrated in Kessy)
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