Oxygen Sensor Replacement - Try A Redundant Ground Lead

[Walter Sherwin]

Someone later pondered "what's the diff" between the three heated O2 P/N's
listed in my prior post.  Good question!  The diffs are minor, and are
described as below.  Basically, whichever one you can find will work for
you.  Happy hunting...........

AFS-40 is "water resistant", and has 4 leads.  Two leads are power & ground
for the heater.  One lead is the O2 sense wire.  The last lead is a
redundant ground, which is also electrically connected to the shell threads.

AFS-45 is a "water proof" version of AFS-40, which just means its a bit more
tolerant of moisture.

AFS-60 is basically the same as AFS-45, but has a slightly different heater.


Walt.





> This may get covered below, (I haven't read that far yet),  but you might
> also want to peruse the following heated O2 sensors since you said earlier
> that you also have custom exhaust headers in your application.
>
> AFS 40  (25108302)
> AFS 45  (25132086)
> AFS 60  (25132529)
>
> Why these sesnsors?  Well, they are all heated single wire type zirc O2's,
> **BUT** they also have a redundant ground sense lead.   In a normal OE O2
> single wire sensor setup, the threads of the shell are expected to ground
> thru the cast exhaust manifolds and eventually connect to the ground plane
> of the cylinder block, to which the ECM/PCM lo-signal sense circuits wll
> also be coupled.  If you add custom headers in between, you often will
have
> also introduced high temp coatings, high temp silicones,  non-conductive
> gaskets, etc.,  all of which can mess with your electrical connectivity
> between the sensor shell and the engine block.  That's why the redundant
> ground lead is handy.  Just connect it to the cylinder block, and then do
> whatever you want with your custom exhaust system.  One way or the other,
> (through either the lead or the shell) you will be connected and operating
> as intended.
>
> For those of using using non-heated O2's with custom exhaust systems, the
> following P/N is applicable.
>
> AFS 23  (25106169)
>
> These are all direct screw-in functional equivalents, for the most part,
but
> they may require some connector fiddling/adaptation depending upon exactly
> what you are trying to accomplish.
>
>
> HTH's
> Walt.


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