A 3 wire 02 sensor for a 86 and later 2.1 waterboxer vanagon should be fine
if that's more convenient.  
If you get it OE style complete with connector plug it's a bit spendy, I
imagine the jetta one is the same except for wire length perhaps, or they
even come 'extra long' so they'll fit many vw applications. 
You can get generic splice-in 3 wire oxygen sensors for 40ish or so.    

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
neil N
Sent: Sunday, February 24, 2008 6:51 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Bentley wiring diagram. Questions on how to read.

Actually I don't have the O2 sensor...... yet.

Is there a compelling reason to use the stock WBX O2 sensor? Less money?

I know *less* about the Jetta system, and even less about the WBX.

Neil.

On Sun, Feb 24, 2008 at 2:57 PM, Mark Drillock <mdrillock@cox.net> wrote:
> I don't know much about the Jetta system other than what I may read in
>  my 93-99 Jetta Bentley. Since he has it I don't see any reason not to
>  use the stock HO2S relay in it's stock wiring configuration between the
>  ECU and sensor. If he did not have it I would try wiring the O2 heater
>  like later 2.1 waterboxer models, from the FP relay.
>
>  Mark
>
>
>
>  Scott Daniel - Shazam wrote:
>  > I have a question for you.
>  > On this vehicle we're talking about here, 93 or 94 Jetta with ABA 2.0
>  > engine...........on the HO2S  ( heated oxygen sensor )  Control Module,
>  > there is a wire from that module to the ECU.
>  > So evidently, or possibly, the ECU is involved in whether or no 02 heat
is
>  > on or not.
>  >
>  > On a vanagon or a subaru the oxygen sensor/s get their heat circuit
>  > energized anytime the key is on, i.e. whenever the ecu is powered up.
In
>  > other words 'full time' regardless.
>  >
>  > So my question is, what to do you think this connection is about ?
>  > My guess it that perhaps the ecu tells the H02S Module to heat the 02
>  > sensors for the first say 15 minutes of running, and then doesn't have
it
>  > get heat power unless the 02 sensor cools down too much at another
period in
>  > that drive cycle.
>  > Any thoughts on that ?
>  >
>  > And also..........I 'would imagine' that if I wired one so it got
'regular
>  > 02 heat' through a normal relay , that the ECU would set a code perhaps
from
>  > not being able to 'see' that control module for 02 heat.
>  > Any thoughts on that ?
>  > Thanx,
>  > Scott
>  > Turbovans.
>  >
>  >
>  >
>

--
Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco"

http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/