First of all, I have researched extensively on the various threads and have tried a few of the fixes mentioned. Today I go over what I have here and head for the Benz to see what may be the actual fix needed. I pulled up a code off of the connector next to the battery, the one with the button and LED, and get 15 flashes. I do it again to make sure I counted correctly. Did some more looking on here and for my car/engine 15 flashes is "not assigned". I did the reset and the CE light is now off. Any ideas from anyone as to what may have caused this to happen? It's a '91 300SE 3.0 w/193,000 well taken care of miles. No problems with driveability, no increase in fuel consumption, smooth idle, plenty of power when needed. The day the CE light came on I was just tootling down the highway at about 50 MPH and hit a slight dip in the road, nothing major just enough to let you know that it was there, and on it came. I had been on the road already for about 30 miles and like I said it was and continues to run fine.
I want to take a moment here to thank everyone who posts here with tips and suggestions, the Webmaster, and Moderators, without you many of us would be pulling our hair out (and I am missing some on top already) trying to figure out these fine automobiles we love so much. I met the Webmaster (can't remember his webhandle) and Benzmac at their shop, very nice guys.
1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)