There are a couple of reasons why the key fob to your audi has stopped working.
Audi door sensor not working.
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They are notorious for going bad.
How to repair door contact sensor.
Audi door not unlocking door not unlocking diagnostic quickly fix all your lock problems with this helpful diagnostic.
If you have access to the vag com software try using it to access the door locking module electronically and resetting it to the default for your car.
On this occassion all door handles and boot sensors work when unlocking the car and all locking sensors work except on on drivers door.
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Door not unlocking diagnostic.
For the sensor your part number is probably 4g8927753b.
Each door has a sensor in the handle.
If your early to mid 200 s audi or vw is gabbing problems with either side door electrical locks windows or anything electrical start by looking here.
You just need to find which door handle sensor has gone bad and replace that sensor.
The door locks are more electronic than mechanical and require a bit of coding to work correctly.
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This article applies to all audi models 2001 present.