What does this sensor do

[Arizona Vipers]

It's mounted on along the frame rails under the headers on drivers and passenger side. See pic-


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[Steve M]

Oxygen sensor.

[Dan Cragin]

They have mounted it outside the exhaust as it is not being used, but needs to remain plugged in to keep the check engine light from coming on.

[Arizona Vipers]

Ok, i just talked to Scot at Arrow, with the 9 liter tune I can unplug it altogether. So off goes another couple lbs with the wrap etc!