I also went through getting a dea.
Mk4 golf door wont lock.
The battery is likely dead and needs to be replaced but the remote s may also need to be reprogrammed to work.
This issue also indicates a bad lock actuator.
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The door lock works in only one direction.
Here is a vid i made on fixing vw golf mk4 door locking mechanisms or rather replacing them.
My mk4 wont lock.
45 mins im down to about 25 on golf front doors i fixed min with a micro switch off a broken module that had a good switch.
If this happens the problem is with the remote.
Locks work from the switch but not the remote.
If your vw golf 4 some door locks are locked and won t unlock then one solution is to make a hole in the door panel to get access to lock mechanism and forc.
Posted in general chat.