What part is this?

[Fingerlakelife]

I had a marina winterize my boat and like always they put the drain plug in a plastic bag zip tied to steering wheel.
Today I opened up the boat to get it ready for the season this was in that bag with the drain plug. They’ve never had this part in the bag and it looks like I should get a new one.
This is off a ‘04 22V
What is this and where does it go?

[h2o-ski]

That is the knock sensor that is threaded into the the engine. My '05 22i had that sensor on the starboard side in the engine block under the exhaust manifold. Make sure to find the single wire that connects to that, otherwise the ECU will start beeping at you.