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Originally Posted by AtlBenz
Anybody know where the leads connect in a 1994 E420? What (and where) is the small box that you speak of. And do you mean to totally disconnect the O2 sensor and measure the resistance between it and ground, or just pull up the leads enough to stick the meter in parallel?
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Leave the O2 sensor itself alone. Follow the lead from the sensor to the black box and disconnect the lead there to do the measurements described. HOWEVER: that procedure concerned my former, 1991 200E (4cyl.), and I'm would very surprised if your V8 is the same. Better look somewhere else.