Hi
I thought a summary of the various options might help.
To re-pair a key that has stopped unlocking / locking remotely.
This one is an easy one.
Just switch on the ignition and then press the unlock button on the key that has stopped working (as long as the battery is not flat in the key fob)
Switch off the ignition, remove the key and it should now operate the door locks,
(you can use one key in the ignition and re-pair a different key if you want, you don't have to re-pair the key in the ignition if that one is already ok)
To add an additional key that has never been paired to the car before.
Firstly ensure that you have bought a key that has the same part number as the one you already have.
You can get a blade cut (there are even people on eBay that can provide you with a new key blade if you just end them a photo of the original blade in the key you already have)
I think that many key cutters can do this for you too. (Timsons and the like)
You can pair the remote operation on the new./secondhand key, but ideally you will need VCDS (there is a method that is supposed to work that involves putting the key in the door lock, but to be honest I have tried this several times and never succeeded).
To pair the remote function on a key that has not been paired before
(The following is done after you have selected control function 46 "CCCU" in the VCDS screen and clicked on adaption)
"Enter channel "21" and click on [Read]
This is supposed to display the number of currently stored remotes in "Stored Value". - Mine always displayed "0" as I think all A2s do?
The "New Value" field is used to indicate the POSITION of the key (out of the 4 positions) NOT the number of keys you want to code,
So instead of following the Ross Tech instructions, try this,
You use the "up/down" arrow to move to the position you want the key to be in (of the 4 possible positions) and then (without clicking test or save or anything) press the unlock button on the key that you want to pair into that position (you might have to hold the unlock down a few seconds, but it is normally quite quick), the field near the top right will change from "initialising" to "Recognised" then click on "save".
You have now paired the first key.
Now repeat this for each key you have (changing the position each time) remembering to save after you get the "recognised" message.
So I would recommend the following, click on the up arrow to get the "1", the field will show "adjustment", press the unlock on the key you want to pair first and the field will change to "recognised" click on save and then you have now paired the first key. Then use the up arrow to move to "2" and then press the unlock button on the second key that you want to pair, when that changes to "recognised" you save that and then repeat for "3" and "4" saving each time. (if you want 4 keys that is!!)
You will now have keys that all work your remote locking.
This process will also work for the new shape keys if you have a CCCU that has a part number that ends in "AF" and a new shape key that has a part number that ends in 220 K. I will be trying to find out which other CCCUs these keys will pair to, but for now I can only guarantee the "AF" unit will pair with a 220 K key (do not buy any other keys, only the 220 K has been proven to work.
The biggest problem you have now is that when you try and use the new key the engine will cut out almost instantly and you will get the flashing "immobiliser" icon.
That is because the final step is to fit a new immobiliser chip and code that to the car. (if you have an old working key that you no longer want to use you can TRY and remove the chip from that and replace it in the new key, but they are well glued in and they are a fragile glass tube. But I have done this a few times and so it can be done. The chip is inside the "key" end of the fob and you will have to lift off the Audi rings to get at the screw that holds it together.
If you can't swap the chip for whatever reason your options are limited. You can take it to Audi to get them to pair the chip (at a large cost). Or you can ask on here if there is anyone local that has the right cable to rad your instrument cluster and get the all important login code to enable you to use VCDS to reprogram a new chip.
I will post a link on this "how to" later, to show how to pair a new immobiliser chip with VCDS once you have your login code.
Steve B
I thought a summary of the various options might help.
To re-pair a key that has stopped unlocking / locking remotely.
This one is an easy one.
Just switch on the ignition and then press the unlock button on the key that has stopped working (as long as the battery is not flat in the key fob)
Switch off the ignition, remove the key and it should now operate the door locks,
(you can use one key in the ignition and re-pair a different key if you want, you don't have to re-pair the key in the ignition if that one is already ok)
To add an additional key that has never been paired to the car before.
Firstly ensure that you have bought a key that has the same part number as the one you already have.
You can get a blade cut (there are even people on eBay that can provide you with a new key blade if you just end them a photo of the original blade in the key you already have)
I think that many key cutters can do this for you too. (Timsons and the like)
You can pair the remote operation on the new./secondhand key, but ideally you will need VCDS (there is a method that is supposed to work that involves putting the key in the door lock, but to be honest I have tried this several times and never succeeded).
To pair the remote function on a key that has not been paired before
(The following is done after you have selected control function 46 "CCCU" in the VCDS screen and clicked on adaption)
"Enter channel "21" and click on [Read]
This is supposed to display the number of currently stored remotes in "Stored Value". - Mine always displayed "0" as I think all A2s do?
The "New Value" field is used to indicate the POSITION of the key (out of the 4 positions) NOT the number of keys you want to code,
So instead of following the Ross Tech instructions, try this,
You use the "up/down" arrow to move to the position you want the key to be in (of the 4 possible positions) and then (without clicking test or save or anything) press the unlock button on the key that you want to pair into that position (you might have to hold the unlock down a few seconds, but it is normally quite quick), the field near the top right will change from "initialising" to "Recognised" then click on "save".
You have now paired the first key.
Now repeat this for each key you have (changing the position each time) remembering to save after you get the "recognised" message.
So I would recommend the following, click on the up arrow to get the "1", the field will show "adjustment", press the unlock on the key you want to pair first and the field will change to "recognised" click on save and then you have now paired the first key. Then use the up arrow to move to "2" and then press the unlock button on the second key that you want to pair, when that changes to "recognised" you save that and then repeat for "3" and "4" saving each time. (if you want 4 keys that is!!)
You will now have keys that all work your remote locking.
This process will also work for the new shape keys if you have a CCCU that has a part number that ends in "AF" and a new shape key that has a part number that ends in 220 K. I will be trying to find out which other CCCUs these keys will pair to, but for now I can only guarantee the "AF" unit will pair with a 220 K key (do not buy any other keys, only the 220 K has been proven to work.
The biggest problem you have now is that when you try and use the new key the engine will cut out almost instantly and you will get the flashing "immobiliser" icon.
That is because the final step is to fit a new immobiliser chip and code that to the car. (if you have an old working key that you no longer want to use you can TRY and remove the chip from that and replace it in the new key, but they are well glued in and they are a fragile glass tube. But I have done this a few times and so it can be done. The chip is inside the "key" end of the fob and you will have to lift off the Audi rings to get at the screw that holds it together.
If you can't swap the chip for whatever reason your options are limited. You can take it to Audi to get them to pair the chip (at a large cost). Or you can ask on here if there is anyone local that has the right cable to rad your instrument cluster and get the all important login code to enable you to use VCDS to reprogram a new chip.
I will post a link on this "how to" later, to show how to pair a new immobiliser chip with VCDS once you have your login code.
Steve B
