In a message dated 4/26/2003 3:12:38 PM Eastern Daylight Time, 
LISTSERV@GERRY.VANAGON.COM writes:

> A couple of questions on the 3 wire sensor. ('88 2.1 L).  If I understand
> this thing, the two white wires are to heat the O2 sensor, and the polarity
> is not important... Right? Now, that leaves the black wire to be connected 
> to
> the fat green wire. Is that the signal wire, or is it a ground wire??
> Secondly, does the wire have to be sheilded?
> 

       Brian, Two white wires are for the heater.  Polarity not important as 
you suspected.  Black wire is the signal.  Shielded wire is the green wire 
from the ECU.  Must be shielded right up to the terminal end but not 
contacting the terminal end.  Black wire from the oxy sensor is not shielded. 
 If your installing a BOSCH generic oxy sensor and splicing in your old 
connector as I suspect your doing make sure the connections are either well 
soldered or use a good nude crimp connector.  The joint needs to be covered 
with heat shrink tubing so that it is moisture proof.  The joints should also 
be stagered.

Cheers��

Frank Condelli
Almonte, Ontario, Canada
<A HREF="http://members.aol.com/BusFusion/bfhome.htm">BusFusion</A> a VW Camper camping event, Almonte, ON, June 12 ~ 15, 2003
'87 Westy & Lionel Trains
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Vanagon/Vanagon Westfalia Service in the Ottawa Valley
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