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Is it possible that what looks like a plug is the old O2 sensor broken off?
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I'm 99% positive that it is indeed a plug as the top is smooth and has every appearance as that of a threaded plug. It would at least put my mind at ease if it were broken off but I do not see any signs of wiring anywhere near this location. I have a sinking feeling that it was removed for whatever reason by a previous owner. I guess I should go to the module and see if I can find the wiring there. Looks like I may be putting a sensor in. Which brings me to another question. Does that mean that an air pump should also be reinstalled?