Thanks, I feared so.

It appears as though the speed sensor is working as the cruise control now works again during the test drive, that also suggests that the brake switch is also functioning.

After being stranded on the road and having a MB dealer do the work (but couldn't get the sensor) I am hoping that the code read and reset is a nominal cost or free.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles