The car is 2012 VW Passat.
For a second year in a row, when it gets really cold, the passanger's outer door handle-mechanism freezes and I cannot open that door.
When I lock/unlock the car I hear a regular "click" sound that indicates that the lock mechanism seems to work fine.
Also, when I get into the car from the driver's side, I am able to use the inside door handle to freely open the passenger door.
Both a mechanic and dealership (without even looking at the issue) told me that it would cost $500-$600 to replace the door lock mechanism (the part alone is about $150-$250 if I am not wrong).
I do not believe that the lock mechanism is at fault here - and doubt that mechanic and dealer are there to help out on this issue.
The fact that the lock itself sounds fine, and the door does open from the inside tells me that the outer door handle mechanism seems to be the issue.
Question is, what would be the best method to treat this problem or at least further diagnose it?
WD40? Any other suggestions?