Diagnostic Software for VW-Audi Group Cars

 
881 Sumneytown Pike, Lansdale PA 19446, USA

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                    Key Matching with 4-digit SKC 

Key Matching with 4-digit SKC
Updated 21 Dec. 2010

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.


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                    Key Matching with 4-digit SKC