Replace the door check before it breaks the door or body.

Inner Door Panel Removal DIY Links
http://www.peachparts.com/shopforum/showthread.php?t=150747


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1994 Mercedes Benz E 320 Sedan
Part: Door Check
Note: Front : Left & Right
Rear : Left & Right
O3010-55821 Door Check Meyle IN STOCK $24.48

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1UH0TIW001UI10L0QL&year=1994&make=MB&model=E-320-001&category=All&part=Door+Check