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Old 07-09-2006, 03:47 AM   #1
Smoke Show
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Default p0037 with a catch......

check engine light came on... p0037 so i cleared the code and it went away for maybe 20 mins then came back on. i look up the code up on here and its saying its the last o2 sensor on my exhaust... but thats my wideband via the txs tuna.... and the tuna seems to be working fine. any ideas?
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Old 07-09-2006, 06:43 AM   #2
Arctic Penguin
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that would be the stock rear o2 sensor it is trying to tell you is malfunctioning

are you sure you understand how the check engine function is supposed to work?
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Old 07-09-2006, 12:48 PM   #3
Smoke Show
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Quote:
Originally Posted by Arctic Penguin
are you sure you understand how the check engine function is supposed to work?
i hate idiot comments. its my living so yes.
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Old 07-09-2006, 01:05 PM   #4
Gethin
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If you removed the stock rear o2 to install your tuna wideband o2 then you will get the 0037 code. I used the opensource tools to get rid of my code (reading the stock subaru ROM then overwriting the offset location with a null code), as I have the LM1 bosch wideband in the rear o2 spot.

Check out this thread, which spills over into another thread.

http://forums.openecu.org/viewtopic....315&highlight=
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Old 07-09-2006, 01:10 PM   #5
blasphemy
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Quote:
Originally Posted by Smoke Show
i hate idiot comments. its my living so yes.

According to your initial post, it would seem as though you are no longer using the factory O2 sensor. It is my understanding that there is no wideband O2 from the factory, so if you removed the factory rear O2 to use your TXS Tuna, then that is the problem. Either you have some sort of fix for your factory sensor no longer being used, or you may have had the code blocked through some sort of EM, to prevent the CEL.

How long have you been using the TXS Tuna? If it was installed fairly recently, and the factory O2 has just been unplugged, then this would be the reason for the CEL. Since the factory ECU has finally realized their is a problem with the rear O2 (The fact that it is no longer there). If you have had this in place for awhile and you are just now getting the CEL, check to make sure your fix is in place to prevent the code (whether it be mechanical, electrical, or blocked CEL through EM).

I honestly do not really know what I am talking about, so take this with a grain of salt.

AP
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Old 07-09-2006, 01:23 PM   #6
Smoke Show
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i see the misunderstanding now.... i've had the tuna since it was first realased (w/ the bosch).. so a long time now, and i've just recently had the this c.e. light occur.

but thanks for that other thread i shall investigate.
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Old 07-09-2006, 01:31 PM   #7
ImpreziveWRX
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I am not sure if this will help...
My friend's car happened to have the same code
He got the stock 02 sensor with a mechanical CEL fix since he is running no cat
The code pop up after 2 year of daily driving for no reason
We check all connections and the sensor is still in good shape
Reset the codes an it came back on again after 20~30 minutes

Later on I discovered his AEM air filter is in a physical bad shape.. When he took it off and wash it he somehow damaged the filter. I replaced his filter with a new one, reset the code and itís gone completely again.

Maybe you can check the filter?? Just a suggestion.
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Old 07-09-2006, 01:34 PM   #8
Hallis
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I would check your factory rear O2 if it's still there. Did you pull it to make room for the wideband or did you drill and weld an additional bung into the exhaust?

At least it's just an emmissions code. You could do a resister mod possably to fix that. Or tune it out.

Shane
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Old 07-11-2006, 09:49 PM   #9
Smoke Show
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i've replaced the rear 02 with the wideband. what i'm curious as to now.. is why didn't it throw the code way back in the day when i first installed it?!
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Old 10-28-2006, 04:14 PM   #10
thejean
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I currently have the P0037 code and the car idles pretty rough since getting it. I am tuning with enginuity and that code is unchecked in in the map I made with enginuity so I am not sure why I still have that code. I thought maybe it was my front O2 sensor but the consensus seems to be that P0037 is the rear O2 sensor. Can someone help me out? If the box is unchecked, I shouldn;t be getting that code. Also, why the car run rough even if that code was there... I thought it was strictly an emmissions thing? JC

Last edited by thejean; 10-28-2006 at 04:19 PM.
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Old 10-28-2006, 05:08 PM   #11
TMessick
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P0037 = downstream O2 heater circuit low. Not sure how your wideband is wired in, but I believe the most likey cause is either a short or open circuit in the downstream O2 heater.

As far as crappy running with this code (thejean) -- I wouldn't expect poor running as a result of this. Downstream has some minimal effect on fueling overall and at idle, if the O2 heater isn't working, the sensor will get cold and read incorrectly. This would cause funky fueling, but I don't think it would be a big enough effect to cause an issue. On the other hand, if you have a different upstream O2 problem, you could be jacking your fueling all around; and if you have the other faults turned off, you may not know it. Reccomend posting a new thread and taking some data logs at idle.
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Old 10-29-2006, 01:24 PM   #12
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Default

Thanks TMessick. I'll make a new thread with some logs I took yesterday.
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