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E36 General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.

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Old 03-14-2006, 02:52 AM   #1
ivopivo
 
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weird CEL...

today, i cut out my cats, put in o2 sims and something weird happened.... when everythign was done, the CEL came on and gave out the code for pre cat sensors heating something... p0155 i think, 1137 bmw code. weird thing is, it won't turn off... we tried erasing the code with both peake tool or regular obdII tool and it won't erase it....
comments?
oh we also tried disconnecting the battery for a while..
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Old 03-14-2006, 08:29 AM   #2
tomctx

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One of the 02 sims bad?
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Old 03-14-2006, 08:33 AM   #3
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Hum, I had an issue like that with my sims as well... I don't remember how I fixed it, but have to run now, I'll think about it and update this post later when I figure it out. Sorry I can't be more help, but there is a fix.
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Old 03-14-2006, 10:29 AM   #4
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Quote:
Originally Posted by tomctx
One of the 02 sims bad?
they're brand new (well like 200 miles old)
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Old 03-14-2006, 06:43 PM   #5
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Quote:
Originally Posted by komodo
Hum, I had an issue like that with my sims as well... I don't remember how I fixed it, but have to run now, I'll think about it and update this post later when I figure it out. Sorry I can't be more help, but there is a fix.
did you remember yet ??
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Old 03-14-2006, 07:14 PM   #6
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Quote:
Originally Posted by lecchilo
today, i cut out my cats, put in o2 sims and something weird happened.... when everythign was done, the CEL came on and gave out the code for pre cat sensors heating something... p0155 i think, 1337 bmw code. weird thing is, it won't turn off... we tried erasing the code with both peake tool or regular obdII tool and it won't erase it....
comments?
oh we also tried disconnecting the battery for a while..
fixed.

lol jk, but i have no idea man, i would suggest emailing whoever you bought your 02 sims from or the actual company that made em
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Old 03-14-2006, 08:05 PM   #7
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Originally Posted by xsperf
fixed.

lol jk, but i have no idea man, i would suggest emailing whoever you bought your 02 sims from or the actual company that made em
actually... it was 1137 bmw code, bank 2 sensor 1 i believe. also, the code is coming up for the front sensors, not for the rear ones, where i put the o2 sims. i don't know if installing the o2 sims had anything to do with the code though, but it's coming from the front sensors, not the sims. someone help, i don't want to get brand new cats and sensors just to diagnose this crap
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Old 03-14-2006, 11:00 PM   #8
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no no i was joking.. i guess your a little older than us kids but 1337 = leet... haha

btw, try removing O2 sims and see if they pull a different code
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Old 03-15-2006, 12:16 PM   #9
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bump...
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Old 03-17-2006, 02:27 AM   #10
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komodo, did you remember yet, can you help me out ? thanks
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Old 03-17-2006, 02:34 AM   #11
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Hey, sorry.

I remember I fought with my sim for almost 8 hours straight one day. There's 4 wires going to the O2 sensor: the ground, the accessory power, the heater power, and the signal return. After fooling with it, I ended up having to leave my o2 sensors on the pipe (drilled a hole for them, useless, but for storage), and leave the two heater wires going to the o2 sensor, rerouting the signal and ground to the sim. I double-tapped into the power wire, and cut the signal wire, routing the output from the sim straight to the ecu. Make sure you check voltages with a multimeter constantly, because we had issues getting the right connections.

This is how I finally had to end up wiring it:


That look similar to yours?
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Old 03-17-2006, 03:20 AM   #12
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Quote:
Originally Posted by komodo
Hey, sorry.

I remember I fought with my sim for almost 8 hours straight one day. There's 4 wires going to the O2 sensor: the ground, the accessory power, the heater power, and the signal return. After fooling with it, I ended up having to leave my o2 sensors on the pipe (drilled a hole for them, useless, but for storage), and leave the two heater wires going to the o2 sensor, rerouting the signal and ground to the sim. I double-tapped into the power wire, and cut the signal wire, routing the output from the sim straight to the ecu. Make sure you check voltages with a multimeter constantly, because we had issues getting the right connections.

This is how I finally had to end up wiring it:


That look similar to yours?

i'm sorry i don't quite understand...
are those o2 sensors the rear or the front ones? my code is for the front sensor heater power....
i'll understand a bit more if you tell me if those are front or rear sensors...
if you can, go on aim, ivo328i is my sn

thanks a lot and sorry to bother you so much, i just really want this crap fixed
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Old 03-17-2006, 03:25 AM   #13
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^^ OH! My bad. Yeah, I had my sims on my post o2 sensors because of the x-pipe getting rid of the cats.

Why are you running pre-o2 sims?
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Old 03-17-2006, 03:28 AM   #14
ivopivo
 
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Quote:
Originally Posted by komodo
^^ OH! My bad. Yeah, I had my sims on my post o2 sensors because of the x-pipe getting rid of the cats.

Why are you running pre-o2 sims?
i'm not i was just trying to figure out the diagram...
i'm saying the code that i get from the CEL, is for the heater circuit for one of the front o2 sensors... so i'm wondering if that has anythign to do with the sims...
the diagram you drew is of the sims and the rear o2 sensors correct?? your front ones are just normally installed correct??
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Old 03-17-2006, 09:42 AM   #15
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^^ Yep, front o2 sensors are untouched, sims installed in conjunction with post-cat o2 sensors.
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