02 sensor - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

LSAmac · 07-06-2025, 12:29 AM

Question about my O2 sensors, I attached a photo below of the scan..

The car has NO cel but it was running weird, not feeling as snappy or loud for a couple days so I decided to scan it. I got those codes back and I’ve done my google search of it but I’m curious with headers and tune…

1-How would aftermarket headers affect this?
2-If the 02 sensors were cleared out during tuning would they still pop up on my fairly cheap obd scanner?

I’m sure this is pretty common so I figured someone’s dealt with it and can save me some time, will swapping bank 1 & 2 downstream (sensor2) O2 sensors solve it most likely? Also would both upstream senses still be there with the TSP headers?

Thanks for any replies just trying to get an understating of it

tartagliazl1 · 07-06-2025, 07:07 AM

The rears are deleted out with headers but will show on a scan as a stored code. With a tune they only use the front O2 sensors.

LSAmac · 07-06-2025, 12:26 PM

Quote:

Originally Posted by tartagliazl1

The rears are deleted out with headers but will show on a scan as a stored code. With a tune they only use the front O2 sensors.

So would I just disregard these codes then? If I’m not mistaken these codes are for the rear O2 sensors which would be sensor 2. The car is definitely running worse but that’s the only thing popping up on the scanner so I’m assuming it needs to be addressed

How would a “stored code” appear on the obd reader? In this instance it’s yellow and shows it as a “mild” problem, I’m not sure if the owner before me tuned them out or not and how I can even go about figuring out if he did. It was already tuned when I got it so I’m not sure what was done and what I should ignore. Thanks in advance, just confused a bit.

1JEWLDSSRS · 07-06-2025, 04:08 PM

Looks to me like they were not totally disabled in the tune..

LSAmac · 07-06-2025, 04:43 PM

Quote:

Originally Posted by 1JEWLDSSRS

Looks to me like they were not totally disabled in the tune..

Would replacing the downstream sensors help at all? If the car wasn’t running weird I wouldn’t mind but it’s definitely running weird, and I don’t tune so im not really sure how that’ll all play into each other. I keep reading that they get tuned out but the vehicle is running worse so I’m not sure if these sensors are even linked to it

Joe.G · 07-07-2025, 09:03 AM

So them being marked Permanent just means that they had set a code but the ECM never cleared it so since the code the vehicle has never met the conditions that it expects and then clears it on it's own. A regular scanner can not clear these codes. I am assuming they could be cleared by the tuner. The down stream sensors really are there to make sure the Cat's are working correctly and should not effect how the car is running. I would look else where for your running issue.

gtstorey · 07-07-2025, 09:16 AM

Permanent codes can't be cleared with HP Tuners. And I don't think it can be cleared with any other tuner program. Either the equipment has to be reinstalled or and let the test complete or the ECM has to be completely reprogrammed through SPS programming, and the codes turned off prior to startup. And I'm not 100% sure that the reprogram gets rid of them.

Joe.G · 07-07-2025, 09:27 AM

That is what I figured, I just wasn't 100 % sure if HP Tuners could or not.

07-06-2025, 12:29 AM	#1
LSAmac Drives: 14 zl1 Join Date: Jun 2022 Location: michigan Posts: 24	02 sensor Question about my O2 sensors, I attached a photo below of the scan.. The car has NO cel but it was running weird, not feeling as snappy or loud for a couple days so I decided to scan it. I got those codes back and I’ve done my google search of it but I’m curious with headers and tune… 1-How would aftermarket headers affect this? 2-If the 02 sensors were cleared out during tuning would they still pop up on my fairly cheap obd scanner? I’m sure this is pretty common so I figured someone’s dealt with it and can save me some time, will swapping bank 1 & 2 downstream (sensor2) O2 sensors solve it most likely? Also would both upstream senses still be there with the TSP headers? Thanks for any replies just trying to get an understating of it Attached Images

07-06-2025, 07:07 AM	#2
tartagliazl1 Drives: 2013 zl1 vert Join Date: Dec 2018 Location: Rochester, New york Posts: 1,202	The rears are deleted out with headers but will show on a scan as a stored code. With a tune they only use the front O2 sensors. __________________ 22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ big gulp 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ cnc,milled ported heads/ brick mod/BMR toe and trailing arms/ 781hp 748 tq SAE @17.3lb on a loaded dyno.

07-06-2025, 04:08 PM	#4
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 14,034	Looks to me like they were not totally disabled in the tune.. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

07-07-2025, 09:03 AM	#6
Joe.G Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021 Location: NY Posts: 1,763	So them being marked Permanent just means that they had set a code but the ECM never cleared it so since the code the vehicle has never met the conditions that it expects and then clears it on it's own. A regular scanner can not clear these codes. I am assuming they could be cleared by the tuner. The down stream sensors really are there to make sure the Cat's are working correctly and should not effect how the car is running. I would look else where for your running issue. __________________ GM 3.91/TrueTrac OEM ZL1 Rims, 6 Piston Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, GC Aluminum DS,Stainless Works Ceramic LTH/HiFlo Cats, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace, Moroso Catch Can,SCT X4 Dynosteve,Remote Clutch reservoir,Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount. Last edited by Joe.G; 07-07-2025 at 09:28 AM. Reason: Spelling

07-07-2025, 09:27 AM	#8
Joe.G Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021 Location: NY Posts: 1,763	That is what I figured, I just wasn't 100 % sure if HP Tuners could or not. __________________ GM 3.91/TrueTrac OEM ZL1 Rims, 6 Piston Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, GC Aluminum DS,Stainless Works Ceramic LTH/HiFlo Cats, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace, Moroso Catch Can,SCT X4 Dynosteve,Remote Clutch reservoir,Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount.

07-07-2025, 09:16 AM	#7
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,450	Permanent codes can't be cleared with HP Tuners. And I don't think it can be cleared with any other tuner program. Either the equipment has to be reinstalled or and let the test complete or the ECM has to be completely reprogrammed through SPS programming, and the codes turned off prior to startup. And I'm not 100% sure that the reprogram gets rid of them.