Thought Id share my story on this issue which may shed some light on it. The bend lighting (afs) error came up for me 2 days before my car was in for its first MOT (perfect timing!). Both cornering bulbs were off like most people here. because of this I didnt bother with changing the bulbs cos i thought if both are off must be a sensor and the car is still under warranty till the 22nd nov so ill get them to fix it before the mot.
Car was in for its MOT yesterday and passed which I was supprised with the bulb error but apparently that not part of the mot. not gonna argue with that! they said they couldnt get to the bottom of the issue so could I say in my courtesy car another day and they'll try sort it tomorrow.
got a call few hours ago saying its all fixed asked what the issue was "*sigh" dont ask!"
she went onto explain that they originally changed the bulb on one side, didnt work, took the bulb out put the old one back in then changed the bulb on the other side still no joy. they then changed a few sensors still no joy. eventually had to ring some internal tech helpline....
turns out you cant change one bulb at a time...both have to be changed at the same time or it errors. 2 days without my car cos of something simple like that!
Has anyone heard of the system needing 2 new bulbs for it to clear? from a technical stand point i dont see how it could know the difference
on the plus side I got both bulbs for free and a kit kat for my trouble haha