branko

Hi Guys,

Im looking at upgrading my cat as a prt of my zorst upgrade. Im looking at Car Sound bolt on high flow, but I dont know if I need one with a boss or not.

I have a genuine '93 JDM SiVTEC (H22) prelude which is OBD1 to my knowledge and shouldnt have a secondary O2 sensor after the cat.

But....

I was having a look and I noticed this on the cat
http://www.arach.net.au/~branko/lude/zorst/old_cat1.jpg
See here too:
http://www.arach.net.au/~branko/lude/zorst/old_cat1.jpg

At first from afar it looked as the O2 sensor, but at a closer look it cant be!
Its smaller and only has 1 wire connected to it. My friends 95 Si doesnt have it. What is it? And does it have the same diameter boss so I can screw it in where the O2 sensor is ment to go in.


Thanks for your help!

Machine Head

it does look like an O2 sensor, the single wire is actually a heat sheild hiding 2 wires undernieth

__________________
Orlando

RIP Jape...

branko

no, its definitely 1 wire only. I disconected the wire harness and there is a single connector in there. Its much smaller then the O2 sensor which is up on the header.

Taters

It is one wire . It goes to a light on the dash board, looks like a cat with heat waves coming off top.

It is designed to show you when the cat is not working properly.

I guess as the cat heats up the copper sensor expands making a connection which illuminates the light.

branko

Thanks, thats right, the exhaust place I went to told me that its heat sensor very comon on JDM cars.