I Want To Remove My Cats. Can?

[centurion]

Originally Posted by shaaz

Nope. Nothing at ALL, i took out my mid-cats and replaced them with a stainless steel mid pipe. Took out my original headers and installed a aftermarket one. All sensors intacted and no check light.

Now Shaaz, tell me then how come. Because, there are sensors before and after the Cats, and these measure adherence to emissions legislation. (it's the law).

Now you take away the cats, and these things measure anyway. Should they now detect that there is no more cat and put the engine into limp-home mode?

Strange, right? Have you wondered?

It's mandatory to put the engine light on actually, it doesn't just write into the OBD2 log.

[Rastaman]

Originally Posted by shaaz

Well, i don't have any cats or precats and i have no check lights and all my O2 sensors are still intact so ... for me no problem ..

Same goes for me as well !

[Rastaman]

Maybe u dun get it yet, lemme try n make it clearer y there is no check light. Simply coz we all have installed after mkt headers which come with 2 holes to fit the 02 sensors. These are way in front of the precats so there is no problem even if u decat.

[shaaz]

Originally Posted by Rastaman

Maybe u dun get it yet, lemme try n make it clearer y there is no check light. Simply coz we all have installed after mkt headers which come with 2 holes to fit the 02 sensors. These are way in front of the precats so there is no problem even if u decat.

YUP YUP !!!!

[louis]

i've never understood why the CEL doesn't come on either. aren't they suppose to register different oxygen levels pre-cat and post-cat under normal operating conditions? if both sensors are now placed pre-cat, wouldn't they register similar oxygen levels and hence trigger a fault code?

[shaaz]

Honestly same here, but when i did it and no lights came out, couldn't care less why it did not come on.. hahaaha.

[MRacer77]

as i always say as long as it works, don't really have to understand how it works...

[shaaz]

Well said........

[BlackStealth]

Thats why those automobiles engineers work their arse off for our added leisure!

They get paid and we pay. So fair deal.

[centurion]

hey man, everybody here don't understand why CEL don't come on and lead me on to think that you do, then suddenly everybody admit don't understand ....

I did some more research last night because this thing bothered me, and here is what I think now....

The post cat sensors are actually located OUTSIDE the path of the exhaust. The precat sensors are intact.

The post cat sensors are measuring the oxygen level of ambient, OUTSIDE the exhaust, which is perfect without emissions.

Without an air mass sensor, all this PASS. No problem. No CEL.

Check your car and see. The oxygen sensor is OUTSIDE your exhaust path. Just check.