grey wire through firewall

[jmfamily]

hey, hows it going? Im new (obviously) and have just got a honda city turbo 1, going over it at the moment, cleaning this, checking that, and i have noticed that AC has been removed (dont really need it so dont mind) so obviously there would be spare wires around the engine bay that wouldn't go to anything. SO my question is, is this wire part of what was the ac system or does it go to something completely different? Any help will be GREATLY appreciated. :D :D
Jonathan
[img]http://s1.postimage.org/9ui9jhkqz/sensor.jpg[/img]

[Hyperblade]

That goes into the catalytic converter.

[jmfamily]

thanks for the quick reply, it seems that i dont have a catalytic converter, i guess it was removed by the last owner, is it alright to leave it hanging there or would it be best to get it welded into the pipe? if i unplug it from inside the car, will it upset the car, or will it work just like how its working now?
thanks for the help.
Jonathan

[bmgjet]

Personally Id just cut it off shorter and earth the wire so you dont have the dash light on.

[Charles]

That is an exhaust over heat sensor. It registers a light on the dash it the exhaust gets too hot but does not run through the ECU in any way. It gives you a bit of a warning if you are running too lean etc. It is a basic EGT sensor.