In further sleuthing it seems that when the key is turned excessively a contact is made and then the door lock vacuum system then works.

I wonder, is it possible that the tumbler is slightly twisted and needs to be repositioned?

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)