Herr Kapitein!I have found ze oxzygen zensor connektor!

[mzarifkar]

I am tracing down a 1221 code, and i want to do a voltage test of the O2 sensor, finding it was a pain in the ass! i first tried to reach itt from the top, but that just cut my arm on some broken wire insulation, so i went in from underneath, without jacking the car up (i pride myself in being capable of getting in, and often out of tight spaces) so i crawl in from the front, pulling myself up from some crossbar and now i have these nice greasy grill lines from the oil pan cooling fins on my face and chest ( car was cold so no burns )
and even though my girlfriend found the grill marks sexy, i would like to know if anyone has a better way of testing the output of a 02 sensor with a voltage meter (As described in bentleys) to determine if i need a new o2 sensor ( but i am considering doing the torch cleaning first if it turns out it is the sensor)
for the record i have a 95 525 with m50tu motor (auto trans)

[shogun]

why do you make it that complicated?
They go to the MOTRONIC, and there you can test the oxy sensor very easy on that cable from the oxy sensor.
You have to check which cables that are, I only know it on my V12 engine.
Wiring diagrams here
http://www.e38.org/e34/