The heater element in a heated O2 sensor draws high current when cold, but
tapers off when hot.  The accepted method is to wire in parallel with the
fuel pump 12V.
It won't take anything away from the pump after warm-up.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Geza Polony
Sent: Thursday, September 07, 2006 10:51 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: O2 Sensor Idea (long)

Good responses all.

OK, so what I'm hearing is, don't mess with the O2 sensor voltage--but
install a heated sensor. Maybe not perfect, but better than the unheated
variety.

What would you attach the heating element wire to? Maybe the coil? Or given
the resistance, maybe run another circuit altogether?

Anybody done this?

Seems to me, also, that there are more posts here regarding 02 sensors
during the winter months than in the summer. Possible further confirmation
of the heating problem?