Speedometer works fine and cruise control works, but odometer does not register miles traveled.

I know this is an electrically operated speedometer and odometer. Does anybody have any idea why the odometer does not work? Is it fixable.

P.E.H.

It's one of the most common problems with W126s. You have a worn out gear or gears in the speedometer cluster. They're made of plastic and wear out over 20-30 years. You'll have to replace the offending gear(s). It's a DIY operation if you know what you're doing.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.