Stevebfl is right. I learned how to adjust the mixture to my 300E by reading his posts, as well as the posts of many other people with this interest. I bought a new DMM from Sears for 30.00 with the duty cycle reading capability.
By the way, I found the codes and their meaning in my W124 CD manual. They were buried in there. I believe the 201 are in there as well.

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified