ses light, o2 sensor problem! (just put in headers)
i have some codes popping up reading H02S2(B1) is that from putting my new headers in? i got some obx 1 piece headers installed about a couple weeks ago and when i was driving on the highway the ses light comes on. Is there a way to make this light go away? any help will be great thanks!
ace
oh and for more info.. just forgot to say that the obx headers come with the spot for the first 02 sensor. and the second o2 sensor is strapped near the the fan. sooo whhat can i possible do? right after i put the headers on, for the first 2 weeks it was fine and just all of a sudden the light came on!
Last edited by nissan-ace-specv02 : 10-29-2009 at 09:18 PM.
strapped near the fan? that sounds like your prob. they have headers with two o2 sensor holes. that would cause major prob.s if my understanding of o2 sensors is correct. so your ECU would be reading that the first bank is actual, and the second bank is as lean as you can get. meaning it would constantly try to adjust your air/fuel ratio to correct the lean in bank 2. probably tried to adjust for two weeks and now is running rich with false reading of lean(ECU prob thinks theres a leaks). if you can afford to get the two o2 sensor exhaust and sell the one you got at slight loss, then maybe you could cut second bank sensor off and tie into first bank for an actual reading, but check around and ask your mech. if this will work, might not fool the ECU and might just give you another code and/or make things worse.
sensor 2 is only really for emissions, it usually mounts in the center of ur converter, or just after, like boyrs said, if this reading is much different it will set the code.... did u remove the converter?
sensor 2 is only really for emissions, it usually mounts in the center of ur converter, or just after, like boyrs said, if this reading is much different it will set the code.... did u remove the converter?
yea i did remove the converter, i just didn t want to end up buying a new engine. so i m glad i did get headers, just now i have headers that only have one hole for the sensor. will a bad reading mess up my car? like will it end up destroying the 02 sensor?
i believe with the sensor just hanging in the engine bay (which i think is what u did?) that sensor is going to read extreamly lean, i know i said the second sensor is mainly for emmisions but im not 100% sure if it will mess up the air fuel ratio.... maybe the best way to tell is bring it out, beat on it, turn it off and check the plugs to see if it looks lean or rich...
i believe with the sensor just hanging in the engine bay (which i think is what u did?) that sensor is going to read extreamly lean, i know i said the second sensor is mainly for emmisions but im not 100% sure if it will mess up the air fuel ratio.... maybe the best way to tell is bring it out, beat on it, turn it off and check the plugs to see if it looks lean or rich...
the o2 sensor isn t just hanging there. i found a spot that kinda just fit into then strapped it on. lol i means its not dangling around. how do you check if the plugs looks lean or rich? i ve been reading up on extending the wires and getting a bung welded on right after my midpipe cat? this a good i dea?
bet she's never driven better since you put those headers on. running rich is actually better than running lean, but running rich is hard on an engine, if anything happens to your cooling system then it increases chance of serious damage, not to mention your spitting alot of unburnt gas out your tail pipe. (in the old days, guys mounted spark plugs in the tailpipe and used it to ignite their exhaust)
you can run your car on the rich side if you want to, but you'd need to fool your ECM, i don't like it constantly re-adjusting the air/fuel mixture. the stress on the ECM is bad, these QR25DE ECM's are not something you want to go out on you.
you need a 12.5V reading coming off this sensor to get a "regular" reading. that's why i figure you should be able to tie into bank 1 for the reading. just don't know if it'd sense that the reading was mirrored since it raises or lowers the voltage to indicate rich or lean. but if it did work, you'd be back to running at optimal AF mixture (believe they use two now-a-days to increase the response time in tuning the mixture, think you can get same results with one, just takes more engine cycles to adjust) it's just that false reading that's making it try to re-adjust. to put it after the the cat would give a similar false reading just not as strong. That is your cat converter, the one on the header is only a pre-cat, that's why you can take it out. the exhaust coming out of your cat should be clean as it can get, there's no more air pollution control from that point on.
bet she's never driven better since you put those headers on. running rich is actually better than running lean, but running rich is hard on an engine, if anything happens to your cooling system then it increases chance of serious damage, not to mention your spitting alot of unburnt gas out your tail pipe. (in the old days, guys mounted spark plugs in the tailpipe and used it to ignite their exhaust)
you can run your car on the rich side if you want to, but you'd need to fool your ECM, i don't like it constantly re-adjusting the air/fuel mixture. the stress on the ECM is bad, these QR25DE ECM's are not something you want to go out on you.
you need a 12.5V reading coming off this sensor to get a "regular" reading. that's why i figure you should be able to tie into bank 1 for the reading. just don't know if it'd sense that the reading was mirrored since it raises or lowers the voltage to indicate rich or lean. but if it did work, you'd be back to running at optimal AF mixture (believe they use two now-a-days to increase the response time in tuning the mixture, think you can get same results with one, just takes more engine cycles to adjust) it's just that false reading that's making it try to re-adjust. to put it after the the cat would give a similar false reading just not as strong. That is your cat converter, the one on the header is only a pre-cat, that's why you can take it out. the exhaust coming out of your cat should be clean as it can get, there's no more air pollution control from that point on.
so don t quite understand what your saying i should do lol. what do you mean by "tie into bank one"? like i honestly don t wanna drive my car if it can cause it to get worse very low on funds. can you just explain it to me again if you don t mind?
u can drive ur car, it may be a little harder on gas then usual, but it wont really hurt it if ur going to fix it in the near future, there is another way around this, u can get a o2 sensor bung welded into the exhaust for the secondary o2 sensor, put it in and u can order a "o2 cheater" or u can make ur own, basically it tricks the ecu into thinking it works properly... heres a writeup on how to do it on a ford, i just did a quick search to show u what i was talking about, but there both 4 wire o2's so this should work the same for u
u can drive ur car, it may be a little harder on gas then usual, but it wont really hurt it if ur going to fix it in the near future, there is another way around this, u can get a o2 sensor bung welded into the exhaust for the secondary o2 sensor, put it in and u can order a "o2 cheater" or u can make ur own, basically it tricks the ecu into thinking it works properly... heres a writeup on how to do it on a ford, i just did a quick search to show u what i was talking about, but there both 4 wire o2's so this should work the same for u
You should have both o2 threaded in, most just use an o2 spacer, that does the trick and you don't have to mess w/ any of your wiring. The 2nd o2 sensor needs to read the " cleaner air " . Just like stock, your 2nd o2 norm. reads after a pre-cat. So w/ header mod. you have elminated your pre-cat so now your 2nd o2 isn't reading correctly. Add o2 bung w/ spacer or you can mess w/ wiring to trick ecu.
If you need an o2 spacer, hit me up! Just threads in and can't short out and no need to splice wires.
Good luck!
__________________
Mark
XS Power Racing Header/OBX/Megan Racing Header contact me for discount 2.5L 4cyl or 3.5L V6 Also I have o2 spacers! SE-R SpecV Here! + Feedback Here!
You should have both o2 threaded in, most just use an o2 spacer, that does the trick and you don't have to mess w/ any of your wiring. The 2nd o2 sensor needs to read the " cleaner air " . Just like stock, your 2nd o2 norm. reads after a pre-cat. So w/ header mod. you have elminated your pre-cat so now your 2nd o2 isn't reading correctly. Add o2 bung w/ spacer or you can mess w/ wiring to trick ecu.
If you need an o2 spacer, hit me up! Just threads in and can't short out and no need to splice wires.
Good luck!
but i don t have a spot to put the second o2 sensor man.. my header only came with the first o2 sensor hole. other wise i wouldn t consider extending the o2 wiring. is there a spot just after the headers that i can weld a bung to? then put a spacer in? that possible? if not what kind of wire is the o2 sensor wire something you can buy in a store?
but i don t have a spot to put the second o2 sensor man.. my header only came with the first o2 sensor hole. other wise i wouldn t consider extending the o2 wiring. is there a spot just after the headers that i can weld a bung to? then put a spacer in? that possible? if not what kind of wire is the o2 sensor wire something you can buy in a store?
Yes, you can drill hole/weld nut or have muffler shop add a 2nd o2 bung. Or you can get a 2004+ Midpipe, stock they had 2nd o2 bung in midpipe, while 2002-2002 had both o2 bungs on manifold.
Yes, you can drill hole/weld nut or have muffler shop add a 2nd o2 bung. Or you can get a 2004+ Midpipe, stock they had 2nd o2 bung in midpipe, while 2002-2002 had both o2 bungs on manifold.
ohh ok thats why i was seeing some of the o2 sensors in the midpipe. so just to get this straight. i can drill a hole right after the headers, then put my bung in. after that put the spacers in (which is also called the ghetto sim right?) not sure. those are spark plug anti foulers right. i d rather do it this way then trying to extend the wire. please correct me if i m missin anything. and thanks so much for the help! i m planning to fix this tomorrow. getting a guy to do it for me tho so he can weld for me.
ohh ok thats why i was seeing some of the o2 sensors in the midpipe. so just to get this straight. i can drill a hole right after the headers, then put my bung in. after that put the spacers in (which is also called the ghetto sim right?) not sure. those are spark plug anti foulers right. i d rather do it this way then trying to extend the wire. please correct me if i m missin anything. and thanks so much for the help! i m planning to fix this tomorrow. getting a guy to do it for me tho so he can weld for me.
You got it - if you need a o2 spacer/AKA Ghetto sim let me know, I have tons all drilled out ready to install Just msg.me.
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Just msg.me.
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