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Audi introduced a revised A4 in late 2004, with the internal designation of B7. This new range A4 utilised the existing Volkswagen B6 (PL46) platform, a chassis derived from the outgoing B6.

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How do you program a new key with any other key?

I just got a new key because I cannot find any of the other keys. I’ve done some research but all the solutions required at least the valet key. The key is cut but I still am trying to figure out how to program it into the car. Do you need a special device to do this?

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@john683 try this:

There are longer steps if the keys are new and those are the secondary ones.

Steps to reprogram keys to a car they are already linked to:

1. Press and hold the unlock key on a remote

2. Insert key in ignition and turn to on (while still holding unlock)

3. Hold unlock while in the on position for 2 seconds

4. Turn key to off, remove from ignition and release button.

Do this for each remote. Relink to seat positions (press and hold mem position #, then unlock button for 2 seconds and release both) and done. 

To program new remotes on a car never linked to previously:

1. Take a key (valet key works best, put it into the ignition and turn the key to the "on" position, so the dashboard lights come on.

2. Roll down the driver's side window (not required, but a good idea in case there's a problem).

3. Exit the car and close the door.

4. With a second key, physically lock the doors by turning the key clockwise (don't use a remote).

5. Take the first remote to be programmed, press the unlock button. The lights will flash once. 

6. Wait 10 seconds and press the unlock button. The doors should unlock. That first transmitter is now programmed.

***If you have only one key skip to step 16. Otherwise continue to step 7.***

7. Lock the door again (physically) with the key, (not the remote) by turning clockwise.

8. Press the unlock button two times with a one second interval in between, the lights will flash with each button press for a total of two flashes. 

9. Wait 10 seconds and press the unlock button. The doors should unlock. The second transmitter is now programmed.

**If you have three keys proceed to step 10. Otherwise skip to step 16.***

10. Lock the door again (physically) with the key, (not the remote) by turning clockwise.

11. Press the unlock button three times with a one second interval in between, the lights will flash with each button press for a total of three flashes. 

12. Wait 10 seconds and press the unlock button. The doors should unlock. The third transmitter is now programmed.

***If you have four keys proceed to step 13. Otherwise skip to step 16.***

13. Lock the door again (physically) with the key, (not the remote) by turning clockwise.

14. Press the unlock button four times with a one second interval in between, the lights will flash with each button press for a total of four flashes. 

15. Wait 10 seconds and press the unlock button. The doors should unlock. The fourth transmitter is now programmed.

16. Remove the key from the ignition.

from here

Of course there are a bunch of youtube videos as well as instructions on here

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Do you know how to do this without a key fob? I currently cannot find mine and only have what looks like a non-factory key. When I try to turn the car on, the starter starts revving up, after a few seconds the engine might actually turn over but immediately cuts out (likely due to the immobilizer). I also have "SAFE" displayed under the trip odometer. So far this is just a giant paperweight and I'd rather not spend an arm and a leg to get a new key

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