Leaving the Pre Cat O2 unplugged

[ChronoGN]

Whats the function of pre-cat O2 sensor? Is it like the post cat O2 sensor where you can just leave it unhooked and it doesn't affect the performance at all? I have my wideband O2 sensor where the precat O2 goes so, its been left unplugged. Don't see any problem with it so far. I'm thinking about just deleting the SES code with the HPtuner.

[youngsc]

Re: Leaving the Pre Cat O2 unplugged

Precat is testing the effectiveness of the engine and sensors aftercat is going to test how well the cat is doing at filtering the **** out.

[ChronoGN]

Re: Leaving the Pre Cat O2 unplugged

Precat is testing the effectiveness of the engine and sensors aftercat is going to test how well the cat is doing at filtering the **** out.

Effectiveness of the engine? What do you mean by that? Bank 1 and Bank 2 sensors have to do with testing if the engine is running stoichiometric. So, what else is there to test to see if the engine is running "effective" ?? BTW, I'm running a straight pipe with only the turbocharger as a muffler so, I don't need any of these emission stuff.

[97rs4life]

Re: Leaving the Pre Cat O2 unplugged

the precat and post cat sensors are used to check emissions efficiency. The o2s in the exhaust manifolds themselves are the ones that do the a/f adjustments for your car to operate correctly

You can leave it unplugged. Most people with widebands remove the precat o2 and put their wideband in there instead and just tune out the o2 ses light from it

[coolbet13]

Re: Leaving the Pre Cat O2 unplugged

wouldn't the precat o2 be the one before the cat I believe you guys are referring to the postcat o2 sensor the one after or am i mixed up?

[Niko97RS]

Re: Leaving the Pre Cat O2 unplugged

if u unplug ur post cat 02 will it throw a code? i mean the "exhaust"(air) will be REALLLY clean?

[97rs4life]

Re: Leaving the Pre Cat O2 unplugged

if u unplug ur post cat 02 will it throw a code? i mean the "exhaust"(air) will be REALLLY clean?

yes a code will be thrown

[97rs4life]

Re: Leaving the Pre Cat O2 unplugged

wouldn't the precat o2 be the one before the cat I believe you guys are referring to the postcat o2 sensor the one after or am i mixed up?

I was talking about both of them in my posts.

[ChronoGN]

Re: Leaving the Pre Cat O2 unplugged

Cool, thats what I was thinking. Just more unnecessary emission stuff. Thanks! :)

[coolbet13]

Re: Leaving the Pre Cat O2 unplugged

you need the O2's in the manifolds for your car to run right otherwise you car will refer a default a/f ratio instead of what is actually coming out, So for your car to run at the fullest extent of it's performance you need them. However the one after the cat you can trash, just tune the code out.

[Niko97RS]

Re: Leaving the Pre Cat O2 unplugged

why would the post cat 02 throw a code 97RS?

[97rs4life]

Re: Leaving the Pre Cat O2 unplugged

why would the post cat 02 throw a code 97RS?

because it will no longer be reading your cat efficiency as it is now unplugged. An o2 sim or going into the computer with hptuners and turning off that code is all that is needed