The full ohm of resistance isn't across the wire, it's across the sensor.
Should be no problem soldering on an extension.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
Max Wellhouse
Sent: Thursday, March 11, 2010 9:57 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 02 Wire Resistance Questions

My 90 GL runs on a Haltech engine management system and it uses a pretty
much standard 3 wire Oxygen sensor.  Irt dawned on me the other day that I
haven't replaced it in the 9 years it's been in service.  Figuring it was
time to replace it, I found a generic 3 wire Bosch sensor at Advanced Auto
with the right sized 3 pin GM styled plug and once I got everything home and
apart, the plug  and the wires won't reach the female connector for the EMS.

since I had to solder and heat shrink extensions on the original, I cut
those wires off the old sensor in hopes of having enough wire to make the
new one reach.  While fiddling around with some VOM readings, the two heater
wires tested out as pretty much not having any resistance in them, but the
signal wire had like a full ohm of resistance.

I guess my questions go like this:
1. Are there problems soldering extension wires to get the plug to reach,or
do I find a sensor with wire long enough to get the job done?  Can I use
copper wire or does it ned to be that silver core stuff like is on the new
and old sensor?

2. Is a full ohm of resistance acceptable or is that part of the "problem"?

As always, adise is always appreciated.

DM&FS