Immobilizer IV Key Matching

From Ross-Tech Wiki

This procedure details how to match new keys to VW/Audi/Seat/Skoda vehicles with Immobilizer IV.

Determining IMMO-ID & VIN

[25 - Immobilizer]
[Meas. Blocks - 08]
Select Block 081.
The first 17-digit string is the VIN. The second 14-digit string in the Immo-ID..
[Done, Go Back]
[Close Controller, Go Back - 06]

Key Matching


  • All keys are either new or were adapted to this car (IMMO-ID) before.
  • You can match up to 8 keys.
  • While adapting each key, make sure to place the other keys away from the ignition lock (reader coil). The passenger seat is an adequate place.
  • Battery voltage at least 12.0 V.

[25 - Immobilizer]
[Meas. Blocks - 08]
Select Block 001.
The value in field 3 must be Yes. If value is No, the key is not capable of being adapted to Immobilizer.
You can check each key in this manner.

Select Block 003.
Make sure the shown lock times in field 1, 2 and 3 are 0 (each field represents a time in minutes).

  • If the lock times are NOT 0:
    • Do NOT switch off the ignition!
    • Allow the car to sit for AT LEAST the number of minutes that were indicated by the fields 1-3.

If lockout time was present check Group 1.3 as mentioned above to confirm "Yes" is shown.
[Done, Go Back]

[Security Access - 16]

  • 4-digit PIN
    • Enter zero followed by the 4-digit PIN. For example, if your PIN is 1234, enter 01234.

[Do it!]

[Adaptation - 10]
Enter 001 in "Channel Number".
The "Stored Value" is the number of keys currently matched.
Enter a "new value" corresponding to the total number of keys to be matched, including any existing keys.
The old keys are automatically being cleared.
[Done, Go Back]
[Close Controller, Go Back - 06]

  • Repeat the following steps until all keys have been matched:
    • Switch ignition off and remove key.
    • Insert next key to ignition and switch ignition on again.
    • The warning light for the Immobilizer will light up for ~2 seconds, then go out.

Note: The above steps after saving the adaptation, should not exceed 60 seconds!