The LED will not give you all the codes. You need to build a "home-brew" tester, or buy a tester. Go to the bottom of the page in this link. http://pages.prodigy.net/jforgione/MB_X11.html
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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