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O2 sensors keep going out

This is a discussion on O2 sensors keep going out within the General Help forums, part of the LSx Technical Help Section category; I keep having a problem with my two front (upstream) O2 sensors going out. I have a cat delete and ...

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    crazy ass white boy dennis ss's Avatar
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    O2 sensors keep going out

    I keep having a problem with my two front (upstream) O2 sensors going out. I have a cat delete and when I had the car tuned I had the rear O2's deleted. Twice now I replaced my front O2 sensors and at 70.00 a pop I'm getting pissed. Could the tune be the problem? When I replace the sensors my ses light goes out and after a few days it's back on again. The car runs rich and the fuel mileage goes out the window, I also notice a decrease in performance. The car doesn't run rough but the code reads upstream O2 sensor bank 1 bad/rich. I still have the stock manifolds on the car as well. Any help is greatly appreciated.
    2002 Camaro SS/M6. Volant CAI, 80mm TB w/spacer, cat delete w/ ory, borla XR-1 w/ cme, custom tune, 3.73's, 8,000k HID headlights and foglights, 19" staggered ruff 278 wheels.

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    What brand sensors and are you utilizing an extension harness?

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by pajeff02 View Post
    What brand sensors and are you utilizing an extension harness?
    I'm using bosch oem direct replacement O2 sensors and no extension harnesses

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    Most members have had great luck with the Bosch 13111's in their LT's -- I run the same setup. Any chance you have a wiring issue? Are codes being thrown for both banks? Can you read your air/fuel ratio or fuel trims?

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Most members have had great luck with the Bosch 13111's in their LT's -- I run the same setup. Any chance you have a wiring issue? Are codes being thrown for both banks? Can you read your air/fuel ratio or fuel trims?
    Actually yes, codes are being thrown for both banks and saying running rich. Thats why I just replace both O2's. I also think I have a small vaccum leak as I notice the car holds on to the rpm's when I let off the throttle. could that cause an issue? I don't think there is a wiring issue as the car never acted up until after the lap top tune I had done. I know the tuner messed with the timing and air/fuel ratios

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    Stockitie Stock Stock 95camaroZNC's Avatar
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    Ive heard running rich can burn out o2 sensors, however im still running 2 stock o2 sensors on extensions and they arent burning out at all. Longtubes to a 3 inch x pipe with no mufflers and dumped and have yet to burn one out. When i had the x pipe put in they broke one but i replaced it and havent had a issue since. Dunno what to tell you but if all you have are headers and no cats it shouldnt be burning o2s out. I wouldnt throw the o2 sensors out that keep burning up, i hope your taking them back as "Defective". My advice if you did put headers in the car would be to get a tune, youve almost blown through 200-300 bucks as it is.

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    Quote Originally Posted by dennis ss View Post
    Actually yes, codes are being thrown for both banks and saying running rich. Thats why I just replace both O2's. I also think I have a small vaccum leak as I notice the car holds on to the rpm's when I let off the throttle. could that cause an issue? I don't think there is a wiring issue as the car never acted up until after the lap top tune I had done. I know the tuner messed with the timing and air/fuel ratios

    Any additional air entering AFTER the combustion chamber will cause the O2's to read lean and result in fuel being added to the engine. Any vacuum leaks would add air BEFORE the combustion chamber and result in a lean condition as it is being introduced after the MAF.

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Any additional air entering AFTER the combustion chamber will cause the O2's to read lean and result in fuel being added to the engine. Any vacuum leaks would add air BEFORE the combustion chamber and result in a lean condition as it is being introduced after the MAF.
    So a vacuum leak wouldn't be the culprit then. I wonder what the deal is. I guess it's time to go to a shop.

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by 95camaroZNC View Post
    Ive heard running rich can burn out o2 sensors, however im still running 2 stock o2 sensors on extensions and they arent burning out at all. Longtubes to a 3 inch x pipe with no mufflers and dumped and have yet to burn one out. When i had the x pipe put in they broke one but i replaced it and havent had a issue since. Dunno what to tell you but if all you have are headers and no cats it shouldnt be burning o2s out. I wouldnt throw the o2 sensors out that keep burning up, i hope your taking them back as "Defective". My advice if you did put headers in the car would be to get a tune, youve almost blown through 200-300 bucks as it is.
    I don't have headers on the car, I only have a cat delete and still have my stock manifolds on the engine. I had a tune done already and was wondering if maybe he screwed something up.

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    Other things that can make the car run rich: A real dirty air filter, an obstruction in the intake, a bad Engine Coolant Temperature (ECT) switch, excessive fuel pressure, leaking injectors, etc. Know anyone with a scan tool?

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Other things that can make the car run rich: A real dirty air filter, an obstruction in the intake, a bad Engine Coolant Temperature (ECT) switch, excessive fuel pressure, leaking injectors, etc. Know anyone with a scan tool?
    Yes. My friend scanned with an sct tuner. Thats what told me about the banks 1/2 O2's running bad and rich. No other codes came up

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    Stockitie Stock Stock 95camaroZNC's Avatar
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    Which bank keeps going bad, is it bank one bank two or both?

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    Quote Originally Posted by 95camaroZNC View Post
    Which bank keeps going bad, is it bank one bank two or both?
    Both banks, upstream O2 sensors. I just replaced them last night and reset the computer by disconnecting the negative terminal on the battery and this morning the ses light is back on again

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    Stockitie Stock Stock 95camaroZNC's Avatar
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    You do know you dont have to reset the computer each time, its really not doing much for you at all, the lights still there you just have to travel 30 miles for it to cut back on and the system to completely reboot. So your light has to do with something other then your o2s. Bad wiring or something somewhere possibly also do you have your sensors from the rear still? If so swap those with the front ones assuming they werent bad and see if that does anything all the o2s in all 4 banks are the same. Further more if you can to pin down this problem more possibly, take pictures of where you put the o2 sensors in. Might not help me very much but someone else might see something wrong and be able to help with this problem more. Also when you had the o2s popped off did you have them kill the EGR as well? Lastly is the car running choppy or is it jerking at all when sitting at a stop?
    Last edited by 95camaroZNC; 06-27-2010 at 12:25 PM.

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    crazy ass white boy dennis ss's Avatar
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    Quote Originally Posted by 95camaroZNC View Post
    You do know you dont have to reset the computer each time, its really not doing much for you at all, the lights still there you just have to travel 30 miles for it to cut back on and the system to completely reboot. So your light has to do with something other then your o2s. Bad wiring or something somewhere possibly also do you have your sensors from the rear still? If so swap those with the front ones assuming they werent bad and see if that does anything all the o2s in all 4 banks are the same.
    The rear O2's are there but I had them deleted when I had the car tuned. There are no other codes coming on other than the ones stated earlier. This is a pain. I just bought and installed the new bosch O2's last night, I don't know what else to do

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    Moderator Cutlass's Avatar
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    what are the actual code numbers?

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    crazy ass white boy dennis ss's Avatar
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    Well the ses light went out on it's own and has stayed off for a full day now. Maybe the computer need time to adjust and get the proper readings from the new O2 sensors? I will keep you posted on how it's going.

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    Stockitie Stock Stock 95camaroZNC's Avatar
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    Its supposed to notice i think after 1 cycle if the fuel mix is off. But def keep us posted.

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    It's possible for a bad or aftermarket MAF to cause a rich condition correct??

    I've heard or read that even though you are actually running lean, the PCM could be overcompensating for a lean condition which would be sending too much fuel into the mix causing a rich condition.

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    crazy ass white boy dennis ss's Avatar
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    Another day and no ses light. Car is running noticably better. Performance is back and all is good. Thanks to all for the advice

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