I agree with Mach 4. The 1985 version of the venerable W123 had a number of changes that carried over to the W124 models and one was the new electronics mentioned by Mach4. (Some of these new circuits may have originated with the W201 model; you can tell by the first three digits in the part number.)

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970