remove rear O2 sensors after headers n tune? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Bodywerks · 09-22-2015, 11:37 AM

Pretty straight forward question. My understanding is the tuner takes the rear o2 sensors out of the equation to prevent check engine lights, etc. So can I just remove them entirely?
Why would I want to do that, you ask? I'm going from high flow cats to catless mids when I do my heads n cam. I'd rather not fight those sensors again and risk damaging them. I'd instead rather just install a bung plug and be done.

376LS3 · 09-22-2015, 11:54 AM

Yes, if he turns the rear o2 DTCs off, the code will not appear. Plug the hole and call it good. Dont forget to cap the socket with something so water doesnt get in there. It is still live.

GONIF · 09-22-2015, 12:01 PM

Or you could leave them in and hooked up ,to give the impression nothing has been tampered . This and HF cats give the car a legal/legit look to prying eyes.

bionick · 09-22-2015, 12:44 PM

Quote:

Originally Posted by GONIF

Or you could leave them in and hooked up ,to give the impression nothing has been tampered . This and HF cats give the car a legal/legit look to prying eyes.

it's technically just as illegal to run a non OEM cat on any registered vehicle that is less than 5 years old as it would be to just running no cats. So this guy has a 2015, not 5 years old. You'd get in just as much trouble if you had high flows or no cats from a "legal" prospective

JCunningham · 09-22-2015, 12:53 PM

no need for them cap them. you could probably order pipes without the o2 bungs. If I ever have to replace my Cats ill tell ARH not to put them in.

Destructo09 · 09-22-2015, 02:31 PM

Quote:

Originally Posted by GONIF

Or you could leave them in and hooked up ,to give the impression nothing has been tampered . This and HF cats give the car a legal/legit look to prying eyes.

That's why I have high flow cats. You'll likely fail emissions inspections in NC without cats, but with cats (OEM or not) you'll pass.

GONIF · 09-22-2015, 02:44 PM

Quote:

Originally Posted by bionick

it's technically just as illegal to run a non OEM cat on any registered vehicle that is less than 5 years old as it would be to just running no cats. So this guy has a 2015, not 5 years old. You'd get in just as much trouble if you had high flows or no cats from a "legal" prospective

Yes I know that , I'm an emissions tec. Just saying it would look ok to the untrained eye.

Bodywerks · 09-22-2015, 08:09 PM

Thanks for the replies. This is good to know.
As far as emissions, in pima county AZ, the current emissions testing is to check for DTCs/check engine light and that's about it. Plus, I don't have to worry about that for 4 more years. Who knows, I may be TT 416 by then!

candoege · 09-22-2015, 08:11 PM

You'd get in just as much trouble if you had high flows or no cats from a "legal" prospective

09-22-2015, 11:37 AM	#1
Bodywerks Drives: 2015 2SS/RS/1LE Join Date: Feb 2015 Location: Tucson Posts: 866	remove rear O2 sensors after headers n tune? Pretty straight forward question. My understanding is the tuner takes the rear o2 sensors out of the equation to prevent check engine lights, etc. So can I just remove them entirely? Why would I want to do that, you ask? I'm going from high flow cats to catless mids when I do my heads n cam. I'd rather not fight those sensors again and risk damaging them. I'd instead rather just install a bung plug and be done. __________________ 2015 SS/RS/1LE HSA delete, VMAX throttle body, CAI inc. Intake, PRC255 heads, BTR 660 springs, BTR cryo-treated rockers, PAT G 232/240 .654/.626 110+2, johnson 2110's, Manton 502 pushrods, C5R, Melling high volume/high pressure, Powerbond 25% underdrive pulley, Proform covers, Kooks stepped headers, catless mids, Doug Thorley exhaust. 512rwhp, 446rwtq on a mustang dyno, tuned by Cunningham motorsports.

09-22-2015, 11:54 AM	#2
376LS3 Eh, that'll happen Drives: 2010 2SS Join Date: Apr 2012 Location: Mesa, Arizona Posts: 1,841	Yes, if he turns the rear o2 DTCs off, the code will not appear. Plug the hole and call it good. Dont forget to cap the socket with something so water doesnt get in there. It is still live. __________________ 2010 Camaro SS LS3 - No Modz

09-22-2015, 12:01 PM	#3
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	Or you could leave them in and hooked up ,to give the impression nothing has been tampered . This and HF cats give the car a legal/legit look to prying eyes. __________________ OLD GUY FLYING FAST AND LOW

09-22-2015, 12:53 PM	#5
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	no need for them cap them. you could probably order pipes without the o2 bungs. If I ever have to replace my Cats ill tell ARH not to put them in. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

09-22-2015, 08:09 PM	#8
Bodywerks Drives: 2015 2SS/RS/1LE Join Date: Feb 2015 Location: Tucson Posts: 866	Thanks for the replies. This is good to know. As far as emissions, in pima county AZ, the current emissions testing is to check for DTCs/check engine light and that's about it. Plus, I don't have to worry about that for 4 more years. Who knows, I may be TT 416 by then! __________________ 2015 SS/RS/1LE HSA delete, VMAX throttle body, CAI inc. Intake, PRC255 heads, BTR 660 springs, BTR cryo-treated rockers, PAT G 232/240 .654/.626 110+2, johnson 2110's, Manton 502 pushrods, C5R, Melling high volume/high pressure, Powerbond 25% underdrive pulley, Proform covers, Kooks stepped headers, catless mids, Doug Thorley exhaust. 512rwhp, 446rwtq on a mustang dyno, tuned by Cunningham motorsports.

09-22-2015, 08:11 PM	#9
candoege Drives: ford Join Date: Sep 2015 Location: CA Posts: 2	You'd get in just as much trouble if you had high flows or no cats from a "legal" prospective