Audi S8 2002 - Can't unlock using key

[moltuae]

Hi guys,

This issue is puzzling/concerning me. Has anyone come across this before or get any ideas what the cause may be? ...


My car is an Audi S8 2002 (Final Edition, D2).


Problem: I can lock but not unlock the car using a key, from either the driver's door or the boot/trunk.
(regardless of whether the car was locked using a key or a fob)


Things I've checked:

• Lock and unlock using the Remote key fobs works.
• Lock and unlock using the internal door switch works.

Which initially led me to think the problem must be a faulty door lock switch, but here's the strange thing ...

• When attempting to unlock the door with the key, even though the car doesn't unlock, the interior lights come on.
• And even stranger; if the ignition is switched on, using another key, the car can be locked and unlocked using a key in the driver's door.

Now I recently coded a few more key fobs, using VAG COM (which worked fine), but I've never really had the need to unlock the doors using the key, so I don't know whether it's something I've screwed up with VAG COM or whether it's always been like this. Either way, it concerns me that if there were a problem with the remote key fobs in future, I would have no way to unlock the car.


Any help/suggestions would be much appreciated