'86 CGT oxy sensor

[Craig D. Niederst]

Thanks for everyone's input. The sensor is mounted in the manifold downpipe,
so it looks like a 1-wire sensor will do the trick. Does AutoZone sell these
1-wire sensors too, or do they need to be ordered from a specialty place. If
there is a generic Bosch one available, anyone know the part number for
them?

Craig
'92 100S (90k)
'86 CGT (190k)

----- Original Message -----
From: "Gary Erickson" <erickson at teleport.com>
To: "Craig D. Niederst" <niederst at telerama.com>
Sent: Tuesday, October 03, 2000 11:56 AM
Subject: Re: '86 CGT oxy sensor


> "Craig D. Niederst" wrote:
>
> > With all this oxy sensor talk, I know my '86 CGT is in need of a new
one. It
> > currently has a one wire sensor in it now. I noticed that while this 1
wire
> > sensor plugs directly into a single socket plug on the factory harness,
> > there is a 2 wire socket on the same harness that is unused. Does the
'86
> > CGT take a 3 wire heated sensor, or is the 1 wire one correct? I've
looked
> > in the family album, and its inconclusive. I am hoping replacing this
sensor
> > will correct the horrible idle problems and the poor gas mileage (~12
mpg
> > according to the trip computer). TIA.
>
> Craig,
>
> The Coupe GT's still had the oxygen sensor mounted in the downpipe from
> the manifold (rather than in the neck of the catalytic converter like
> the 4kq's).
>
> That location is warm enough that Audi continued to use the single-wire
> sensor in the GT's through the end of their life.  (The mythical
> high-compression 2.3l special edition GT's sold as '87.5 models may be a
> different story)
>
> The 2-wire socket that you are referring to is a test point for the CIS
> system to plug in one of the diagnostic tools.  Even if you do find 12V
> there, I wouldn't recommend trying to use it as a power source!  ;-)
>
> The single wire OXS is the correct replacement, if you were willing to
> wire up a power source that was switched with the ignition, you could
> easily install a three wire OXS, but I'm betting any gains would be
> minimal.
>
> HTH!
>
> -Gary
>
> '85 turbo GT coupe
> '89 80q
> '89 200q