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Originally Posted by bcm
has anyone heard of an "hall sensor"
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Hall-effect sensors are quite common on newer vehicles.
They are used primarily for sensing crankshaft position, camshaft position, etc.
Prime purpose is to synchronize & " fire " ignitions systems & fuel injectors.
Sorry, can't tell you any specifics ( location or purpose ) on your particular car.

This is what it looks like:
http://img.eautopartscatalog.com/live/F601051836BOS.JPG
Here you go:
http://63.89.49.212/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1R510G7PR1RD1969Q6&year=1988&make=MB&model=190-E-004&category=F&part=Reference+Sensor