Hi there, I have a Honda civic 2010. I will appreciate if you tell me what the orange sensore is for?

Actually, when I bought it(used) I saw a free thick wire that connected to the orange sensor.(it showed by red flesh on the picture)
The engine works well and no warning lights are on.
Thank you for your helpHi there, I have a Honda civic 2010. I will appreciate if you tell me what the orange sensore is for - 1

That's your o2 sensor

Hi sometimes this doubles up as extra spark plug burning off any un-burnt fuel in the exhaust gases.