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      08-23-2015, 09:46 AM   #1
febul
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5 oxygen sensor OBD codes. Help!

I've got an N54 with 50,000 miles on it. Just replaced spark plugs with OEM BMW ones.

I just had my bank 1 after-cat oxygen sensor changed, and now I'm getting these codes:

23C2 lambda probe in front of catalytic converter 2, trimming control.

2C6A lambda probe behind catalytic converter, muddled.

2C7E lambda probe behind catalytic converter, trimming control.

2C6C lambda probe behind catalytic converter 2, system check.

2C31 lambda probe in front of catalytic converter, trimming control.

What could be causing this?

Last edited by febul; 08-25-2015 at 10:21 AM..
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      08-25-2015, 10:20 AM   #2
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Bump.
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      08-25-2015, 11:45 AM   #3
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Maybe you have bank 1 and bank 2 oxygen sensors switched?
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      08-25-2015, 03:29 PM   #4
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Quote:
Originally Posted by Venom View Post
Maybe you have bank 1 and bank 2 oxygen sensors switched?
I'm pretty sure we double checked that at the shop when they replaced one of the O2s. I'll definitely check again. If not, what else could it be?
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      08-26-2015, 12:47 AM   #5
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Try reseting your lambda adaptations
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      08-27-2015, 07:17 AM   #6
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Quote:
Originally Posted by Traf View Post
Try reseting your lambda adaptations
What's the proper procedure for resetting adaptations?

I've read of people having issues after resetting all in one go.
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      08-28-2015, 07:22 AM   #7
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May I ask what you used to read these codes?
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      08-28-2015, 05:17 PM   #8
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Quote:
Originally Posted by edisapimp View Post
May I ask what you used to read these codes?
I used the MHD app with a K+CAN cable.
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      08-29-2015, 05:27 PM   #9
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Any ideas guys?
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      08-31-2015, 12:52 PM   #10
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      09-01-2015, 10:08 AM   #11
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Start by clearing the codes and checking if it comes back.
How is the car running? If idle is rough, check if the sensors were switched by mistake.
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      09-19-2015, 04:07 PM   #12
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Quote:
Originally Posted by mike@x-ph.com View Post
Start by clearing the codes and checking if it comes back.
How is the car running? If idle is rough, check if the sensors were switched by mistake.
Codes come back soon after clearing & driving.
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      09-19-2015, 04:19 PM   #13
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Most likely o2 sensor installed in wrong position like other said or pluged into wrong connector. If not it can also be exhaust leak
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      02-23-2016, 04:34 PM   #14
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The dealer said engine light comes on at 4k rpm and what is causing it is the 4 o2 sensors. Is there a way to bypass or simulate the o2 sensors?
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      03-06-2016, 11:00 AM   #15
febul
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Quote:
Originally Posted by Guam135i View Post
The dealer said engine light comes on at 4k rpm and what is causing it is the 4 o2 sensors. Is there a way to bypass or simulate the o2 sensors?
Get a BMS DP fix.
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      03-07-2016, 05:02 PM   #16
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Quote:
Originally Posted by febul View Post
Get a BMS DP fix.
I'll check it out, Is that a Burger Tuning Down pipe? thanks
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      05-28-2018, 08:09 AM   #17
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Sorry to bump an old thread... But did anyone find the answer to these fault codes? i am having similar codes with my e82?
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File Type: pdf bmw 135i.pdf (26.0 KB, 69 views)
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      05-28-2018, 11:14 AM   #18
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I had the same issue because of an exhaust leak after DP installation. It ended up burning my rear o2 sensors and was giving me the trimming codes. The other possibility is that you got a bad o2 sensor if you bought a new one and/or the o2 sensor bulb was damaged during the install.
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      05-28-2018, 06:48 PM   #19
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Start by flashing back to stock. Does it happen on stock tune?
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      09-23-2018, 03:28 PM   #20
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I'm having the same problem as well. 2C7E code has been haunting me for a while. The car drives fine after I reset the adaptations, but after a few cycles it starts throwing the same code again. I just replaced both o2 sensors in the downpipes and car ran great for a while, then when I was driving this morning the code popped back up. I have no clue what else to do?!?!
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      09-24-2018, 11:06 AM   #21
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Quote:
Originally Posted by DV135i View Post
I'm having the same problem as well. 2C7E code has been haunting me for a while. The car drives fine after I reset the adaptations, but after a few cycles it starts throwing the same code again. I just replaced both o2 sensors in the downpipes and car ran great for a while, then when I was driving this morning the code popped back up. I have no clue what else to do?!?!
Check for an exhaust leak?

Update JB4 and reset the adaptations?
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      09-24-2018, 12:22 PM   #22
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if you need JB4 specific help go over to n54tech
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