could be a lot of reasons, i suspect that your boot lock central locking motor has seized, does the motor whirr? if it doesn't then i'd spray some wd40 into it, if it does whirr then the mechanism around the lock may have become disconnected or broken.
Millions.
for VW Golfs
Had exactly the same problem with my 2001 model. Took lining off rear tailgate and couldn't find anything wrong, unplugged all the connectors in the tailgate then plugged them all back in and for whatever reason this seemed to reset something and the lock has worked perfectly ever since. Via the remote and via the key.
VW Golfs have hydrolic clutches that you cannot adjust.
on most vw golfs before the cat and has 4 wires
no, all the parts are very expensive and upgrades even more.
master key on volkswagen golf 1997 wont open the doors
YOU HAVE ACTIVATED THE CARS ALARM,PUT YOUR KEY IN THE DRIVERS DOOR LOCK AND TURN IT TWICE TO THE RIGHT.
how to replace ignition lock for 1999 vw beetle
I have one key for my 2002 gti, I can not lock the lid. The key wiil not enter the lock. The doors will lock and the rear lid will alarm when opened. Something is in order.
Diagnose your vw for any small faults.
The lock is under the VW emblem -- I believe it turns counter-clockwise.