Key Matching with 4-digit SKC

Ross-Tech is not responsible for any damage or problems that may result from following these
instructions. They are to be used at your own risk.

This procedure details how to match new keys to Immobilizer-equipped VW/Audi vehicles. As of 11
Mar. 2002, VW and Audi are providing 7-digit Secret Key Codes in place of the earlier 4-digit SKC's.
Keys must be coded using the new 7-digit SKC (secret key code) method unless the owner still has
the correct 4-digit code.

VW/Audi used to give out the SKC to vehicle owners but as of 2005 they no longer do. Unless
you already have that information, then you will not be able to use these instructions - you will
likely need to have your dealer perform this procedure.

Important Note:

Unless you ALREADY have the SKC information for your vehicle and

components then you will NOT be able to do any of the Immobilizer functions. Click this link for
more information.

Procedure for matching keys to vehicles with Immobilizer in the Instrument Cluster:

(includes many 1999+ Golf/GTI/Jetta/New Beetle/Passat, also Audi)

1.

[Select]

[17 - Instruments]
[Login - 11]
Enter zero followed by the 4-digit SKC.
For example, if your SKC is 1234, enter 01234.
[Do It!]

2.

[Adaptation - 10]

Enter 21 in "Channel Number"
[Read]
The "Stored Value" is the number of keys currently matched.
Enter "new value" of 0
[Test]
[Save]
This clears out the old key-matchings.
Enter a "new value" corresponding to the total number of keys to be matched,
including any existing keys
[Test]
[Save]

3.

[Done, Go Back]

[Close Controller, Go Back - 06]
Switch ignition off and remove key

4.

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
Switch ignition off and remove key

5.

Repeat step 4 with each key until all keys have been matched.

Procedure for adding keys to vehicles with separate Immobilizer:

(Includes 2000+ EuroVan, Cabrio, and many older non-US models)

1.

[Select]

[25 - Immobilizer]
[Login - 11]
Enter zero followed by the 4-digit SKC.
For example, if your SKC is 1234, enter 01234.
[Do It!]

2.

[Adaptation - 10]

Enter 01 in "Channel Number"
[Read]
The "Stored Value" is the number of keys currently matched.
Enter "new value" of 0
[Test]
[Save]
This clears out the old key-matchings.
Enter a "new value" corresponding to the total number of keys to be matched,
including any existing keys
[Test]
[Save]

3.

[Done, Go Back]

[Close Controller, Go Back - 06]
Switch ignition off and remove key

4.

Insert next key to ignition and switch ignition on again

Count to two ("One one-thousand, two one-thousand") out loud
Switch ignition off and remove key

5.

Repeat step 4 with each key until all keys have been matched.

Key Matching with 7-digit SKC

Ross-Tech is not responsible for any damage or problems that may result from following these
instructions. They are to be used at your own risk.

This procedure details how to match new keys to Immobilizer-equipped VW/Audi vehicles. As of 11
Mar. 2002, VW and Audi are providing 7-digit Secret Key Codes in place of the earlier 4-digit SKC's.
Keys must be coded using the new 7-digit SKC (secret key code) method unless the owner still has
the correct 4-digit code. VW stopped giving out PIN/SKC information at all in 2005.

Important Note:

Unless you ALREADY have the SKC information for your vehicle and

components then you will NOT be able to do any of the Immobilizer functions. Click this link for
more information.

Procedure for matching keys to vehicles with Immobilizer in the Instrument Cluster:

(includes many 1999+ Golf/GTI/Jetta/New Beetle/Passat, also Audi)

1.

[Select]

[17 - Instruments]
Write down the 14 digit Immobilizer ID number from the "Extra" field
(In some newer vehicles, if the Immobilizer ID is not in the "Extra" field, check in
Measuring Block 081)

2.

VW/Audi used to give out the SKC to vehicle owners but as of 2005 they no

longer do. Unless you already have that information, then you will not be able to
use these instructions - you will likely need to have your dealer perform this
procedure.

3.

Measure the car's battery voltage, it must be 12.5 V or higher.

4.

[Select]

[17 - Instruments]
[Login - 11] (In some newer vehicles use [16-Security Access] )
[Use 7-digit PIN/SKC]
Enter the 7-digit PIN, Date on which the PIN was generated by the dealer, along with
the Workshop Code (WSC) and the Importer number of the dealer that generated the
code.
[OK]

5.

VCDS will validate the data you have entered and return you to the Login screen,

where the Login Code will show as "XXXXX".
[Do It!]

6.

[Adaptation - 10]

Enter 21 in "Channel Number"
[Read]
The "Stored Value" is the number of keys currently matched.
Enter "new value" of 0
[Save]
This clears out the old key-matchings.
Enter a "new value" corresponding to the total number of keys to be matched,
including any existing keys
[Save]

7.

[Done, Go Back]

[Close Controller, Go Back - 06]
Switch ignition off and remove key

8.

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
Switch ignition off and remove key

9.

Repeat step 8 with each key until all keys have been matched.

Procedure for adding keys to vehicles with separate Immobilizer:

(Includes 2000+ EuroVan, Cabrio, and many older non-US models)

1.

[Select]

[25 - Immobilizer]
Write down the 14 digit Immobilizer ID number from the "Extra" field

2.

VW/Audi used to give out the 7 digit SKC to vehicle owners but as of 2005 they

no longer do. Unless you already have that information, then you will not be
able to use these instructions - you will likely need to have your dealer perform
this procedure.

3.

Measure the car's battery voltage, it must be 12.5 V or higher.

4.

[Select]

[25 - Immobilizer]

[Login - 11]
[Use 7-digit PIN/SKC]
Enter the 7-digit PIN, the date on which the PIN was generated by the dealer, along
with the Workshop Code (WSC) and the Importer Number of the dealer that
generated the code.
[OK]

5.

VCDS will validate the data you have entered and return you to the Login screen,

where the Login Code will show as "XXXXX".
[Do It!]

6.

[Adaptation - 10]

Enter 01 in "Channel Number"
[Read]
The "Stored Value" is the number of keys currently matched.
Enter "new value" of 0
[Save]
This clears out the old key-matchings.
Enter a "new value" corresponding to the total number of keys to be matched,
including any existing keys
[Save]

7.

[Done, Go Back]

[Close Controller, Go Back - 06]
Switch ignition off and remove key

8.

Insert next key to ignition and switch ignition on again

Count to two ("One one-thousand, two one-thousand") out loud
Switch ignition off and remove key

9.

Repeat step 8 with each key until all keys have been matched.