No you cant. If the O2 sensor is bad the EHA will not be adjusting the mixture at idle. Its readings will not change if you adjust the mixture. You need the new sensor.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

Got my EHA test harness from the MB Dealer today.
Part number 102 589 04 63 00
Total cost to have it UPS to my house, $32
Part name: test cable
WIll be testing the EHA voltage. Anyone used this harness before?
There is not labeling or directions and two of the ends will fit into the EHA harness. One is a straight connector and one is a 90 degree connector, but they will both fit the male connector on the EHA itself.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red