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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 03-10-2014, 06:35 PM
07BMWX3 07BMWX3 is offline
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Location: Canada
 
Join Date: Mar 2010
Posts: 2
Mein Auto: 2007 BMW X3 MSport
Exclamation P0031, P0051, P0037, P0057 Errors

Hi All,

I was wondering if someone could help me with my issues that i have been having..

I currently have a 2007 BMW X3 3.0si and absolutely love the car. It has around 130K.

My check engine light came on so I went a borrowed my friends Autel Maxiscan. I had five error codes when I went to retrieve them. The first one I fixed which was a misfire in cylinder 1. Easy fix, I just replaced the ignition coil.

The next ones have me a little stumped.

P0031 - H02S Heater control circuit low Bank 1 Sensor 1
P0051 - H02S Heater control circuit low Bank 2 Sensor 1
P0037 - H02S Heater control circuit low Bank 1 Sensor 2
P0057 - H02S Heater control circuit low Bank 2 Sensor 2

So these are all related to the O2 senors, I never realized it but there are 4 O2 sensors. I also found that it was odd that all four sensors could have failed at the same-time.

So I did some research and found that in the O2 they pre-heat the sensors I believe to get them up to operating tempatures quickly. I think heaters are powered from a fuse in the front engine compartment F4 30A.

I went and checked and found that the fuse was blown so I replaced it with a new one. I then turned on the ignition to the 3rd pos and I could hear a relay click and POP went the fuse.

I then went ahead and disconnected all the O2 sensors and tried then above again. POP went the fuse.. I then realized that off the same harness a cable went to transfer case. I also disconnect that and the same thing happened.

So I have now determined that I have a short somewhere else or another sensor that is off the same F4 circuit that i have missed.

I was wondering if someone has a electrical drawings that they would be willing to share or if anyone else has has similar issues that could shed some light.

Your help is much appreciated!

Chad H
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  #2  
Old 03-10-2014, 11:36 PM
joylove joylove is offline
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Location: USA
 
Join Date: Mar 2013
Posts: 1,148
Mein Auto: 08 e83 LCI
Replace the relay? Start poking around to find the short with a multimeter?
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  #3  
Old 03-11-2014, 05:47 AM
07BMWX3 07BMWX3 is offline
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Location: Canada
 
Join Date: Mar 2010
Posts: 2
Mein Auto: 2007 BMW X3 MSport
Thanks Joylove,

Would you know what relay it would be? and where its located? Tonight I will start to look for that short.
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  #4  
Old 09-22-2014, 01:15 AM
SOUNDBUSTER SOUNDBUSTER is offline
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Location: GREECE
 
Join Date: Sep 2009
Posts: 2
Mein Auto: E46 330CI 2001
Hi all,

Did you manage to sort it out?.
It seams I have the same issue...
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