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makohonnot sure on 85. my 81 had the sensor in the cat too. it looks like a 3-4" probe about an 1/8" thick with a wire attached to it and a tab with 2 bolt holes in it where the wire comes in.
This is NOT an O2 sensor. It's a temperature probe that's purpose was to turn on/off the smog pump to allow for faster warm up of the cat. Vehicles with this probe did not have O2 sensors.
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