The ground IS made by the 02 sensor/exhaust connection itself.

  I was unsure whether the shielded cover of the harness-end of the
sensor/ECO connection should be grounded somehow, to the sensor? or
what....anyhow...I couldn't get a real answer to that, so I just tried it...

  Mine is now..."Screw the O2 sensor in, connect one wire...and it goes"
quite well.

On Fri, Oct 31, 2014 at 10:05 AM, OlRivrRat <OlRivrRat@comcast.net> wrote:

>                 Don
>
>         How did you end up dealing with the Ground ~ It should, I believe,
> be taken
>
> care of through the Body of the O2Snsr being in contact with the
> ExhaustSystem ~
>
> But I choose not to trust that as the Joints&Bolts in that Path tend to
> get Crudded
>
> over time, so I ScrewClamp a wire to the O2SnsrBody & attach the other end
> to a
>
> Good BodyGroundPoint ~
>
>                                                         ORR ~ DeanB
>
> On 30 Oct , 2014, at 10:34 AM, Don Hanson wrote:
>
> > I run digifant engine management for my inline VW ABA Jetta motored
> > vanagon...same as the stock Vanagons but with the inline motor providing
> > the go..A few weeks ago I had some problems with my engine management
> > system and traced it to a dysfunctional Oxygen sensor.    I'm almost
> > positive the problems were a result of bad wiring between the O2 sensor
> and
> > the ECU, but I have no actual confirmation of that.
> >
> >   Anyhow, I was unhappy with the cost of replacing the Bosch 3-wire
> heated
> > Oxygen sensor in my rig...the best I could find was about $70 for another
> > Bosch heated sensor, and  that one didn't even have the proper plug for
> my
> > wiring harness...So I did some research, called around a bit and
> > asked...and the general response was that I could replace that 3 wire
> > heated oxygen sensor with the single wire Bosch sensor and save myself
> > about $50 without any real downside to engine performance.  But......No
> one
> > would actually come right out and tell me that.   Lotta "Oh, that should
> be
> > OKs"...and "I don't see any reason why that wouldn't work fine"s....There
> > was also some nebulous opinion as to how to properly connect the
> > sensor...Should the shielded wire loom carry a grounding connection or
> > not...etc...
> >
> >   Anyhow I bought a single wire Bosch from Van Cafe and installed it.
> > The results are quite satisfactory.   The only downside has been that
> after
> > sustained highway driving if you shut off the motor for a short while the
> > idle speed is a little low...low enough to stall sometimes...for just a
> > couple of seconds, until the O2 sensor gathers enough heat to resume
> proper
> > function, I guess.
> >
> >   I have regained my fuel economy...back up to 24.xx mpg after 3000 miles
> > with the new sensor. the O2 sensor i again modulating the fuel mix
> > properly....When running with the O2 sensor disconnected from the ECU, I
> > was seeing around 4-6mpg less gas mileage but the motor felt quite happy
> > and strong..
> >
> >   So, in my case, I successfully saved some money on that part and gained
> > back my good gas mileage.   Here's a handy app to help you track your
> > fuel...there's one for the smart phones, too....
> > http://www.fuelly.com/dashboard
>
>