Fine, try and stump me on the only combination that I didn't address.  Well let me think about this.......  Since I have never seen a lambda sensor with only two wires, I'm going to make an assumtion and guess that you mean " there are really three wires, but two of them are white. Does polarity matter on these wires?".  If that is the case, the white wires are different ends of a coil of heater wire and none of my cheat notes say anything about polarity of wire.  Seriously, either direction is fine for the heater.  If by some chance I'm wrong, and there exists a true two wire sensor, then I'm afraid that you will have to contact the vendor.
Mark
  ----- Original Message ----- 
  From: Doss88Wkndr@aol.com 
  To: marokus@voyager.net ; vanagon@gerry.vanagon.com 
  Sent: Tuesday, June 12, 2001 6:00 AM
  Subject: Re: Oxygen sensor-replace or unplug?

  The Ox sensor I bought from one of our list vendors had (2) white wires.  I 
  was under the impression that the polarity of the wires did not matter, is 
  this wrong? 
  ('88 2.1 L Engine) 

  BD 

[text/html]