Could be the master control switch on the drivers door going out or dirty contacts inside it.
Polo drivers door lock.
Sussed it just had to line it up in a certain way it comes out what a complete pita it is to remove the whole door lock mechanism though but once out i dismantled the lock with the intention of re soldering the connections as per a youtube video i couldn t do this as the pcb is covered in a varnish anyway on the basis that i had nothing to lose i sprayed the microswitches with contact.
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There are a few things to it could be.
Issues with the windows locks.
If one set of switches can control the windows it s likely the switch on the opposing side that needs to be replaced.
Vw polo 2000 2002 passenger rear left front door lock mechanism part no 6n4839015c.
The windows work off the passenger side switch but not the drivers side or vice versa.
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They are known to break over time due to the drivers door being open and closed.
Pull the rubber boot back that s located where the door hinges are.
This issue also indicates a bad lock actuator.
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The door lock works in only one direction.
Seeing as this fault is currently 50 50 i d guess that it is a problem inside the door maybe as simple as cleaning re lubing the locking mechanism but beware i ve never ever had this problem with a vw polo so maybe wait to see if anyone else gives better advice in other words i ve never ever eye balled the locking mechanism assembly so can t say if what i m suggesting is possible it.
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