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Two O2 sensors?

Hi there

Just about to remove the old cat and muffler ready for my new cat bypass / muffler (Monty)...

Noticed that there are two sensors on the old catalytic converter, one at the entry to the cat (first picture) and one at the exit of the cat / entry of the muffler (second picture).

Presume that one of them (the one at the entry of the cat) is the O2 sensor - what's the other one??

Also, my new cat bypass only has one hole... any ideas?

Thanks

Karl
Old 09-15-2017, 08:48 PM
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Forgot to mention...

Forgot to mention it is a Japan delivered 1981 SC
Old 09-15-2017, 09:22 PM
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It's not on the parts list either...

6C on the drawing, but nothing to be found on the parts list...
Old 09-16-2017, 12:55 AM
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The Japanese market cars had a temperature senor in addition to the o sensor
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Old 09-16-2017, 05:59 AM
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Thanks Bill

Do I need to keep the temp sensor connected? It would mean drilling a hole and welding in a bung in my new shiny stainless cat bypass...

What happens if I don't connect it?

Karl
Old 09-16-2017, 12:22 PM
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Quote:
Originally Posted by Bill Verburg View Post
The Japanese market cars had a temperature senor in addition to the o sensor
where on the CIS system does it terminate? warm up regulator? or is it more like an EGR valve like the earlier 78-79 3.oL had?
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Old 09-16-2017, 01:37 PM
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Quote:
Originally Posted by KarlA View Post
Thanks Bill

Do I need to keep the temp sensor connected? It would mean drilling a hole and welding in a bung in my new shiny stainless cat bypass...

What happens if I don't connect it?

Karl
Don't know I never looked into it.
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Old 09-16-2017, 01:40 PM
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Quote:
Originally Posted by juanbenae View Post
where on the CIS system does it terminate? warm up regulator? or is it more like an EGR valve like the earlier 78-79 3.oL had?
Don't know I never looked into it.
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Old 09-16-2017, 01:40 PM
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maybe the OP can trace it back to where it lands for our knowledge base? if it turns to a hard copper line running to the back side of the CIS on the passenger side it may be akin to the earlier equipped EGR valve 3.oL motors.

curious minds want to know
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Old 09-16-2017, 02:20 PM
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Trivia...

There are four O2 sensors on our Subaru.

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Old 09-16-2017, 03:34 PM
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Followed the cables today, both go to the engine bay, but neither of them is connected...

I have found a connecting end for the temp sensor but not for the O2 sensor... where should that one be? (Where should the O2 sensor connect to?)

Thanks

Karl
Old 09-17-2017, 02:13 AM
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There are four O2 sensors on our Subaru.

Gerry
From 1996 My all US cars are OBD2 compliant, this requires a pre & post cat. O sensor for each cat.
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Old 09-17-2017, 05:41 AM
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Hi there

Still struggling to find where the O2 sensor connects to in the engine bay - any ideas anyone?

Thanks

Karl
Old 09-20-2017, 12:49 AM
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O2 connector should be attached to a bracket mounted to the body below the fuel filter. The temp sensor would have originally triggered a light and buzzer to alert you the cat is overheating signaling you should shut down the engine. It will cause no I'll effects to just leave it off.
Old 09-20-2017, 07:05 AM
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From what I remember the Japan spec 911s also have a light in the dash that displays (EX), it's between the tach and speedo, the same place as the US spec (O2) sensor light.
You can leave the sensor off, it will have no effect.

As for the O2 sensor plug it should be below the fuel accumulator and filter.

It's a yellowish/whit connection with a green wire on one side and a metal tab for the sensor to plug onto on the other end

Here's some pics from a Pelican Article


Old 09-20-2017, 07:23 PM
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Thanks all, much appreciated

Karl
Old 09-23-2017, 05:04 AM
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