What is this?? should it be plug in??

the thing that is circled in red. this is on the a jdm b18c, the engine is in and running but this thing is just left unhooked. should i cap it?? what is it suppose to be linked to??
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brharris777
Honda Civic / Del Sol (1992 - 2000)
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Jan 17, 2011 08:18 PM



