Oxygen Sensor

[Huw Powell]

Well, they are just switches.

When closed they should read zero or as close as possible (definitely 
less than one ohm).  When open your meter should just read off 
scale/infinite.

They won't "vary" anything, the idle switch tells the ECU to use the ISV 
to maintain about 800 rpm (and kills fuel if it is above ~1400 rpm). 
The WOT switch tells the ECU to go into open loop with a richer mixture 
for enhanced acceleration.

- Huw

I hope you got them wired correctly.

> I soldered a set of the throttle body switches I got.  Unfortuneately,
> they read they had some resistance as opposed to being infinite when the
> switches were not activated.  I don't know what happened to them in the
> process of pairing and soldering them.  However, they were both at a
> perfect 0 when activated so I used them.  I don't think they would
> increase the idle?
>
> This is a 1987 Audi 4000 Quattro.