Well, you can see if your o2 sensor is working pretty easily, in that case.

Don't see to many 60k mile 126 cars anymore.

Curious...how does the odo know to trip that light?

Your diagnostic tool is a multimeter, and this site, of course.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E