5 oxygen sensor OBD codes. Help!

febul · 08-23-2015, 09:46 AM

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?

febul · 08-25-2015, 10:20 AM

Bump.

Venom · 08-25-2015, 11:45 AM

Maybe you have bank 1 and bank 2 oxygen sensors switched?

febul · 08-25-2015, 03:29 PM

Quote:

Originally Posted by Venom

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?

Traf · 08-26-2015, 12:47 AM

Try reseting your lambda adaptations

febul · 08-27-2015, 07:17 AM

Quote:

Originally Posted by Traf

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.

edisapimp · 08-28-2015, 07:22 AM

May I ask what you used to read these codes?

febul · 08-28-2015, 05:17 PM

Quote:

Originally Posted by edisapimp

May I ask what you used to read these codes?

I used the MHD app with a K+CAN cable.

febul · 08-29-2015, 05:27 PM

Any ideas guys?

febul · 08-31-2015, 12:52 PM

Bump

mike@x-ph.com · 09-01-2015, 10:08 AM

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.

febul · 09-19-2015, 04:07 PM

Quote:

Originally Posted by mike@x-ph.com

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.

Dmak · 09-19-2015, 04:19 PM

Most likely o2 sensor installed in wrong position like other said or pluged into wrong connector. If not it can also be exhaust leak

GuamX1 · 02-23-2016, 04:34 PM

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?

febul · 03-06-2016, 11:00 AM

Quote:

Originally Posted by Guam135i

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.

GuamX1 · 03-07-2016, 05:02 PM

Quote:

Originally Posted by febul

Get a BMS DP fix.

I'll check it out, Is that a Burger Tuning Down pipe? thanks

kieranleonard92 · 05-28-2018, 08:09 AM

Sorry to bump an old thread... But did anyone find the answer to these fault codes? i am having similar codes with my e82?

PiggoBenis · 05-28-2018, 11:14 AM

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.

Gangplank · 05-28-2018, 06:48 PM

Start by flashing back to stock. Does it happen on stock tune?

AWCR1MC · 09-23-2018, 03:28 PM

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?!?!

optigrab · 09-24-2018, 11:06 AM

Quote:

Originally Posted by DV135i

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?

optigrab · 09-24-2018, 12:22 PM

if you need JB4 specific help go over to n54tech

08-23-2015, 09:46 AM	#1
febul Private First Class 28 Rep 152 Posts Drives: 2009 BSM 135i Join Date: Mar 2014 Location: New York iTrader: (0)	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..
	Appreciate 0 Tweet Quote

08-25-2015, 10:20 AM	#2
febul Private First Class 28 Rep 152 Posts Drives: 2009 BSM 135i Join Date: Mar 2014 Location: New York iTrader: (0)	Bump.
	Appreciate 0 Quote

08-25-2015, 11:45 AM	#3
Venom Colonel 375 Rep 2,388 Posts Drives: M2 Competition Join Date: May 2011 Location: East Bay, CA iTrader: (5) Garage List 2008 BMW 135i [8.50]	Maybe you have bank 1 and bank 2 oxygen sensors switched?
	Appreciate 0 Quote

08-26-2015, 12:47 AM	#5
Traf First Lieutenant 95 Rep 339 Posts Drives: E82 135i Join Date: Jun 2015 Location: Paris iTrader: (0)	Try reseting your lambda adaptations
	Appreciate 0 Quote

08-28-2015, 07:22 AM	#7
edisapimp Civil Rights Activist 115 Rep 949 Posts Drives: E46 Sedan, E88 Vert Join Date: Apr 2013 Location: Long Island iTrader: (0)	May I ask what you used to read these codes? __________________ E88 Crimson Red Vert MSport 6MT - Listing your mods in your signature is lame. BMS DCI/MHD E30 Flash!!/AA Sport FMIC/VRSF CP w Tial BOV/VRSF 3" DPs/550i clutch w SPEC SMFW/Apex EC-7s/Whiteline RSFB/E92 M3 FCAs/Bilstein B12 Pro Kit/VRSF inlets
	Appreciate 0 Quote

08-29-2015, 05:27 PM	#9
febul Private First Class 28 Rep 152 Posts Drives: 2009 BSM 135i Join Date: Mar 2014 Location: New York iTrader: (0)	Any ideas guys?
	Appreciate 0 Quote

08-31-2015, 12:52 PM	#10
febul Private First Class 28 Rep 152 Posts Drives: 2009 BSM 135i Join Date: Mar 2014 Location: New York iTrader: (0)	Bump
	Appreciate 0 Quote

09-01-2015, 10:08 AM	#11
mike@x-ph.com Joint Chiefs of Staff 24180 Rep 190,777 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	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. __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
	Appreciate 0 Quote

09-19-2015, 04:19 PM	#13
Dmak Second Lieutenant 67 Rep 252 Posts Drives: 09 135 Join Date: Nov 2014 Location: Edmonton alberta iTrader: (1)	Most likely o2 sensor installed in wrong position like other said or pluged into wrong connector. If not it can also be exhaust leak
	Appreciate 0 Quote

02-23-2016, 04:34 PM	#14
GuamX1 First Lieutenant 28 Rep 381 Posts Drives: 08 BMW 135i, 08 128 Cab Join Date: Oct 2011 Location: Guam iTrader: (0)	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? __________________ 2013 BMW X1 * 1973 Clubman GT * 2016 Mazda MX5 * 2000 Honda S2000 2004 BMW 325i Touring * 2009 BMW X5 3.0xdrive
	Appreciate 0 Quote

05-28-2018, 11:14 AM	#18
PiggoBenis New Member 0 Rep 13 Posts Drives: E82 VTT 2+ E30 FBO Join Date: Apr 2016 Location: Was Georgia, Now in Palmdale CA iTrader: (0)	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.
	Appreciate 0 Quote

05-28-2018, 06:48 PM	#19
Gangplank Brigadier General 1541 Rep 3,071 Posts Drives: 2011 e82 135i n55 Sport w/ DCT Join Date: Nov 2015 Location: Vero Beach, FL iTrader: (2) Garage List 2011 135i [0.00]	Start by flashing back to stock. Does it happen on stock tune? __________________ 2011 135i w/ DCT \| ZSP Sport Pkg \| PPK \| Ohlins R
	Appreciate 0 Quote

09-23-2018, 03:28 PM	#20
AWCR1MC Private First Class 11 Rep 89 Posts Drives: 135i Join Date: Feb 2013 Location: San Francisco iTrader: (0)	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?!?! __________________ ~19T turbos upgrade by turbo labs~3.5 Bar Tmap~PR Ignition Kit~VRSF Inlets and outlets~VTT Cast Valve Cover~VTT Dual CC~XClutch Twin Disk~BMS Short Shifter~ER Competition FMIC Kit w/ HKS SSQV~3"AR DP's~3" Custom exhaust~Fuel-It Stage 2 Bucket~ Turner solid engine and transmission mounts~
	Appreciate 0 Quote

09-24-2018, 12:22 PM	#22
optigrab More Boost? 59 Rep 283 Posts Drives: 08 135i MSport 6AT Join Date: Apr 2015 Location: Southern PA iTrader: (2)	if you need JB4 specific help go over to n54tech
	Appreciate 0 Quote