need to know the location of the OBD connection port for my 91 300E Mercedes

see if this helps.copy and paste the link.91 and 93 should be the same. Where is the obd code reader access on a 1993 mercedes … www.justanswer.com › Mercedes if you don't have a reader,there is a guy on e-bay selling these readers,he makes them himself.his e-bay user name is (rpotter66).he has 100% positive feedback.he sells 2 different one's,$29.99.he has sold over 800 of these,and over 300 people are watching his item/s right now.ships worldwide.good luck.

there is no obd port as you might think.you need a scanner with older tech.