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What is this connection and what is it supposed to do?

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I wouldnt think the truck would run to well w/out the O2 sensor hooked up. Is your O2 sensor plugged in?


Where would it "hook up" at? i ran it for over an hour today and didn't notice anything wrong.

it will default to full rich, and will run... could possibly overheat your catylitic converter but no other damage can be caused really, poor fuel mileage too.


follow the exhaust from the engine there ought to be a sensor just above the joint in the exhaust, it will have a pigtail with a plug on it that will join to your mystery plug.


the other one is half of a broken knock sensor which will be located on the drivers side of the block up a few inches from the pan. somewhere between #2 and #4 cylinders

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