Got these warnings today on my 1998 E320 4 matic. The amber BAS/ETS light in the lower left corner of instrument panel is on the all the time. On the multi function indicator, first I get big letters "ETS" above the text EL. TRACTION SUPPORT for a few seconds, then only BAS in big letters. This stays on 'til I reset it. No other lights are on. Brakes seem OK, ABS works right. The yellow triangle #6 indicator light flashes when wheels slip, then goes out when traction is back. Car feels a sloppy on snowy roads. I read the owners manual, a little vague.
Tires are nearly new, good tread, same sizes.

Looking for input on this, what's going on and if this could be a DIY fix.

Thanks, Mike