02 sensor?

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If it's for your 85, there is no O2 sensor. There is a temp sensor located in the cat. They do very different functions.
 
The thermosensor in the FJ60 measures the temperature of the catalytic converter and if it gets too hot the Air Bypass Valve is opened to divert air injection from the exhaust. The sensor mounts near the outlet of the catalytic converter. It plugs into the wiring harness at a connector that is under the center console. It's not hard to replace, but new ones are expensive if even available at all. If you need one, post up in parts wanted and get one from someone that is de-smogging or swapping engines.

There is a picture of the cat and sensor in the first picture of this post: IH8MUD™ Forums - View Single Post - Emissions failure! Although, the cat in the picture is welded in--the stock cat would be bolted in. The sendor is the black wire & sensor that is mounted between the cat (top of the picture) and the muffler (shown below & behind the cat). You can see where the other end of the sensor penetrates through the floor of the truck.
 
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