Thanks Larry,

Instead of removing the 02 sensor, can I just unplug the EHA?

Oil changes have always been 5k or less. Complete valve job ~1.5 years ago.

Thanks Mike

__________________
'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