[V8] O2 sensor circuit, rewire from Ecu?

[NIck Miller]

Took me a minute (or a week) to figure out what you meant by the Kostal
Connectors.  Still working on the issue, and re-read a bunch of stuff on it
again in the archives..  I was basically thinking about doing what you
mentioned anyway, doesn't exactly have to be right to the pins of the ECU,
but as close as I can get it, as right now it runs all over to get to the
ecu the long way.

So, any Idea which "kostal" connector is for the OXS, or how I'm going to
run this anyway?  I've seen that it looks like one has two wires and I think
this is on the left side footwell,  the other looks like its power for the
heater, and goes right to the fuse pannel.  The last one is mine being
added, and it will indeed go to the Engine.  If I'm not mistaken, the ground
for the Heater is the same as the ground for the whole sensor, or just the
exhaust itself, as was with the 3 wires.  Or, maybe I've got it backwards
and its 1 for the signal, 1 for pos and 1 for neg on the heater?  Which,
makes sense... so, again, any more insight is always appreciated.
Unfortunately the manual on Microfiche is not a cure-all as one still needs
to interrupt it. I'm having issues reading their drawings.

On Fri, Feb 5, 2010 at 10:58 AM, urq <urq at pacbell.net> wrote:

> Why not follow the wiring loom?  It goes through a boot near the hood
> hinge.
> Since the OXS pin at the engine block broke on one of my cars I may be
> going
> down this path myself.  You might even be able to snake a wire through the
> jacket of the factory loom ... I've had success with this in the past with
> other Audis.  My plan is to fit a Ford OXS connector myself.
>
> Rather than running direct wires all the way to the ECU, you might want to
> set your sights at the Kostal connectors at the firewall.  This is where
> the
> factory wires go, and it allows the modules to be disconnected the same as
> the factory designed.  I can tell you from experience, that it is
> convenient
> the way the engine wiring loom detaches, allowing the engine to be removed
> without having to remember where all the wires went.
>
> Do not use a chassis ground for the OXS.  If you are going to the trouble
> of
> adding this new wiring, do it right and use the engine block for your
> reference.  It is probably best to look at the factory wiring as a guide.
> The ground for the OXS and the ground for the heater should be run
> separately.  It would be OK to attach both to the engine block, just run
> separate wires for ground.
>
> In fact, what you might want to do is to keep an eye out for a wiring loom
> from a V8Q ...
>
> The trip computer issues are probably due to poor connections in the
> instrument cluster.  Have you confirmed mileage by dividing miles by
> gallons?
>
>