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<E-30> O2 sensor checking

I'm trying to check my oxygen sensor on my '90 325iC (E-30)
and it failed the first test in the Bentley manual!

After I got home, so car is fully warmed up (well, about 15 
minutes after I got home), I disconnected the O2 sensor and 
checked the voltage.  Should I get some voltage?  If so, how 
can it give me some voltage when it's disconnected?

    Thanks in advance!
       Larry.
______________________________________________________________________________
Lawrence R. Schwarcz, Software Design Engr/NCD      Internet:  lrs@domain.elided
Hewlett Packard Company                               Direct:  (408) 447-2543
19420 Homestead Road MS 43LN                            Main:  (408) 447-2000
Cupertino, CA 95014                                      Fax:  (408) 447-2264
Internal-only WWW: http://hpisrhw.cup.hp.com/~lrs/homepage.html
O-
             Copywight (c) 1996 Elmer Fudd.  All wights wesewved.
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