Intermittent remote central locking
2003 A4 Avant TDi
I have an intermittent issue with the remote central locking. Every now and then it just fails to work. Sometimes putting the key in the ignition fixes it straight away. Sometimes it can take a few goes (I usually just ignore it, use the car as normal locking the doors manually until it mysteriously starts working again).
I have 2 keys and both seem to be the same, although I've only ever tried the second key when the main one is failing anyway.
The key always works in the ignition so the car is recognising the immobiliser code on the key (?) it just seems to forget the remote central lock code ?
initially this would happen once every few months and be fine again as soon as they key as in ignition, but it's far more frequent now. Sometimes the car will lock fine, then fail to unlock a few minutes later. Other times it will have unlocked fine, been driven then refuse to lock straight away when getting out. Then it may work fine for days.
Any ideas as this is starting to annoy me now. I've got to manually unlock the drivers door, put the ignition key in and turn it to release the tailgate lock to let my dog in.