1996 audi a4 ignition kill switch wont recognise car keys

use a code reader to reset the CPU after a battery change as it sometimes corrupts the program

Car getting started then cuts off after 2 seconds.Its starter related issue.Either the starter is faulty or battery to starter connection is loose or got short in between.It has to be checked and replaced.Get the voltage checked from battery to starter.The battery should show 12 volts if fully charged.

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.

TRY ANOTHER KEY. COULD HAVE WRONG KEY .IF KEY STILL WONT GO INTO IGNITION SWITCH.SOUND LIKE KEYLOCK CYLINDER IS BROKEN OR ANOTHER KEY BROKEN OFF IN SWITCH KEEPING YOU FROM PUTTING ANOTHER KEY IN SWITCH.

SOUND LIKE FAULTY IGNITION MODULE.

Did you found out the problem? i have the same problem and i want to find out,

check the pigtail on the temp sensor make sure it is clean and well connected i herd that if the pigtail is bad the car won't start also check the crank sensor and the ignition control module also check the fuse panel under the hood for there is a fuse for the ignition

disconnect the ground cable only on the batter for two minutes, be sure the key is not in the ignition, reconnect cable, turn key to on, then turn off. remove the key, reinsert it and crank the car .

the cars cpu? its the cars brain? will need to go onto a computer to find out what the codes are

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
AKAmarko