A4 2002 key fob issue

[ALEEXX]

Hey audi guys, id like to see some suggestions or ideas on what i can do to my problem. Thanks in advance. Recently my key fob went down, i changed the battery but still wont work (key fob). The key is perfectly fine which is good because it will let me start the car at least, but i cant lock the doors, open the car with the control or trunk. The problem is overnight i have to lock the car from the inside but only will lock 3 doors ( passenger, back ones). Driver side will remain open. Now lets say if i order one from ebay or get a key fob that matches my serial key fob number, could i just replace my key to the new key fob and just reprogram it? . Keep in mind it is only the half bottom piece from the key fob that is not working (buttons). And how do i know that this is just a problem with the key fob and not with the computer lock system? ....

[old guy]

Have you tried the basic resync? Put the key in the ignition switch. Turn it to the on position (do not start the engine ). Wait 5 seconds. Turn the key to the off position. Press the lock button on the key. Done.

[Fast4esT]

The lock cylinder in your door does not work either? Cannot manually lock the car with key from drivers door?