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TRY THIS IT MAY OR MAY NOT HELP.PUT KEY IN THE IGNITION SWITCH TURN IT TO ON POSITION WITH THE ENGINE OFF.LEAVE KEY ON POSITION THE IMMOBILIZER WARNING LAMP ILLUMINATES FLASHES.IF WARNING LAMP TURNS OFF IN 30 SECONDS TRY CRANKING CAR.SEE IF IT RUNS WITH OUT CUTTING OFF IF SO.THE AUDI DEALERSHIP HAS TO REPROGRAM THE NEW IGNITION KEY. WHILE THE KEY IN THE IGNITION SWITCH IN THE ON POSITION AND THE WARNING LAMP DONT STOP BLINKING THE DEALERSHIP HAS TO REPROGRAM KEY TO THE IGNITION SWITCH AND IMMOBILIZER.
This happened to me, all you have to do is open the drivers door, insert the key into the ignition, turn the ignition on, off, on, off, on, off, now remove the key and press the lock button on the remote and the car should lock. Be sure to check the other remote, it may have been knock off. If so repeat the steps above for each remote.
I had a similar problem on my Audi A4 1.8T after three seperate trips to different garages I was told I needed a new ignition and it could only be re-coded at an Audi dealer - was told it would cost in the region of £500. As the car was not worth much more than this I did a little research myself and found that the ignition key may have been intermittenly losing its code (as sometimes the car would start ok) I had a new key cut at my local key specialist at a cost of £20 and its been fine ever since (that was over 2 years ago)
Hope this helps
I had this problem with my old Audi 80 and basically it was a knackered fuel pump. If your car is a few years old avoid the main Audi dealers and take it to an independant Audi/Volkswagon specialist and you will save a small fortune.