Decat pipe question (what is this?)

[DR SCHNITZEL]

Hi again.
I took my exhaust off as i need to get a sheared thread drilled out. I stumbled accross this which has been welded into my pipe but goes nowhere.
 
What is it? egt? Its not attached to anything,

[shaunwil]

More likely was a wideband or narrowband that has become a bung.

I think EGT uses a smaller thread. 1/8in NPT and wide band uses a M18x1.5mm

Shaun

[dthebuk]

temp sensor?
 
just a guess, i know nothing on the subject

[DR SCHNITZEL]

this is in the centre of the decat pipe, i thought that was too far away for egt.
is a wideband an air fuel ratio guage?

[DR SCHNITZEL]

also whats a narrowband?

[shaunwil]

Wideband is the ones that measure the AFR across the whole range from rich to lean.

Narrow band are what most cars come with as standard and only give a true reading for AFR of around 14. These are much cheaper to manufacture and only the areas that a standard ecu will use are accurate.

Shaun

[Jono FD3]

defo not a egt sensor as they normaly only have a single wire and this has 3.