Advice please. The key fob in my audi b6 2003 function fails to open the doors but if you close. And the trunk can also be opened with the key.
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Sounds like the switch on the control board under your lock button failed.
You can see the three little switches in this picture:
You can disassemble the key and push the switch under the button to see if it still works and it's just bent away from the button. If yes, you can probably resolder it with some support, but if your button is beat up, it will probably happen again even if you can fix it. You can get a replacement fob cover without the electronics and transfer yours into the new shell (if the switches work) or one with a new board, but you would need to program it to your car.