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Driver door lock won't lock
I have a 1995 E300D (W124) which had a similar problem to that of the original post. Using the key in the driver door lock would lock all doors except for the driver door. Opening the driver door while all the other doors were locked would set off the alarm. I replaced the vacuum element (actuator) which did not solve the problem. I took out the lock mechanism from the door and upon inspection found that one of the metal linkages was twisted. Straightening the linkage solved the problem. I placed a small black arrow on the offending linkage (click to enlarge the photo). Hope this helps someone in the future.
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1995 E300D 
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