What is this plug?

My superduke R lost its bellypan, and as the guts are hanging out, I found an unplugged plug.. picture is attached, and I'm curious if this should be unplugged or not.. what is this for? Any help? Thanks guys.

Looks like O2 sensor and the white plug is the eliminator. So yes it should be like that unless you remove the sensors from the pipes.

sweet.. thanks!

I just put a little tape over the end of the female socket that's hanging loose doing nothing. There's an unbelievable amount of crap that gets slung into that bellypan, you might wanna do the same to protect your connector

I found it during my 15k service I am doing right now

It is just beyond direction on to of front cylinder.

It was not plug (or I unplugged it accidentaly)

What is it purpose and where should I plug it (or not) ?

Comrade: This photo is too close - I can't work out where on the bike we are looking at. Can you take additional one but take a step back.

It is just in the zone between ecu, throttle bodies, coolant expansion bottle on top of front cylinder.

Will try to take an other picture this morning

On our french forum one think that it may be "canister electrovane purge" which is not present on Eu bikes