Requesting help: Anyone know what this wire or tube was (1 Viewer)

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I think that’s for the temp sensor that goes to the OEM catalytic converter.
 

4runner2FJ60

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X2 the cat. sensor wire.....I think there is a rubber plug you can get for the hole if you decide to remove it. Cant remember where i got it?

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Dynosoar

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Cat temp sensor
 

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