cable to cat

[nissanpower]

i recently upgraded my exhaust to a 4in cat back system and a hi flow cat. anyway there are two cables running under the car and connect to the stock cat. does anyone know what these cables are for. because the new hi flow cat has no hole for one of the cables to connect to.. i think the cable is for exhaust temps..

sort of looks like a cable with a spark plug connected to the stock cat?? anyone know if its important..if you need to have it on?

[Blitz]

Pretty sure its an 02 sensor of something similar.

[XrSiSt]

I'm not 100% sure but I read this in the manual that came

with the car that its a temp sensor for the exhaust for

situations where there is a blocked cat or something to that

effect. If it's block the exhaust light comes on in the dash?

Feel free to correct me if i'm wrong.

[OOHSAM]

Its definaltey an O2 sensoor, It should plug in just afer the mesh in the cat. Some cats have a pre drilled hole for it, some dont wich means you gotta get it done at an exhaust place.

[kjb_r33]

its NOT an o2 sensor, its an exhaust gas temperature sensor, you can live without it. O2 sensor is up in the manifold.

[OOHSAM]

My Bad..What was i thinking...Sorry for the confusion guys, Im not all there today...HEY ITS A FRIDAY!

You CAN live without it, but if your CAT gets blocked, the only way you'll know is when you cant breath cuase the fumes will intoxicate your car.....This happend to a supra we just picked up from the docks 3 weeks ago, i nearly threw up in the damn car. I would Strongly reccommend this be plugged in, Also, if your CAT gets blocked, your Gas/Temp sensor will realise there is not an even flow of air/fumes going through the exhaust and your ecu will switch your Engine warning llight on to tell you theres a problem.

Its there for a reason, So USE IT....

[nissanpower]

thanks for the response guys.. hmm yeah i think i'll get the cat drilled and connect the sensor back on. anyone know any good exhaust places around the sydney south-west area?

[Bozz]

What are you all on? I'm sure the cable is there to make a spark in the exhaust on high RPM deceleration so people with 6" exhausts can get flames shooting out the back :shake: