Just thought of another thing:

I replaced the coolant sensor the day before my annual vehicle inspection, during which the passenger-side front and rear wheels were removed.

I have not removed the rear wheels since changing the tires more than a year ago. Perhaps a dirty wheel speed sensor was inadvertently cleaned when that happened(?)

(as an aside, ny rear pads are starting to wear (front pads are new), and the brake light had been constantly illuminating strongly. Post inspection, the brake light now only illuminates once in a while, and in brief flashes.)

Maybe the connection is with the wheel speed sensor...

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black