o2 sensor code help

Elie335 · 08-17-2011, 05:24 PM

Hello fellas;

I've recently installed catless downpipes, and since then I always get the code

2C3E:
2C3E Lambda probe in front of catalytic converter 2, control failure or cable transmission failure?

Any idea what's the cause of the error?

I've searched, nothing explained why could be. Can someone please chime in and explain?

Thanks

enrita · 08-17-2011, 05:36 PM

Seems like the front lambda 2 has issues after the installation of the dps, maybe broken or reverted? I would check that first.

e90328i · 08-17-2011, 05:40 PM

nothing to do with the 02 sensors or you would be getting codes like: p3026 & p0135

OpenFlash · 08-17-2011, 05:43 PM

Quote:

Originally Posted by enrita

Seems like the front lambda 2 has issues after the installation of the dps, maybe broken or reverted? I would check that first.

+1

Elie335 · 08-17-2011, 05:45 PM

Quote:

Originally Posted by enrita

Seems like the front lambda 2 has issues after the installation of the dps, maybe broken or reverted? I would check that first.

Thanks for the reply enrita.

can you be more specify on the location of the lambda 2 please? I mean which downpipe to check, passenger side or driver side?

enrita · 08-17-2011, 05:50 PM

Quote:

Originally Posted by Elie335

Thanks for the reply enrita.

can you be more specify on the location of the lambda 2 please? I mean which downpipe to check, passenger side or driver side?

Pretty sure is bank 2 (cyl 4-5-6) which should be the driver side dp? Not 100% sure though.

Elie335 · 08-17-2011, 05:58 PM

Quote:

Originally Posted by enrita

Pretty sure is bank 2 (cyl 4-5-6) which should be the driver side dp? Not 100% sure though.

Yes, driver side DP is the one for the cyl 4-5-6.

so its the upper O2 sensor on the downpipe that controls cyl 4 5 6 to be checked

Elie335 · 08-17-2011, 06:06 PM

oh my bad, its not the upper sensor, its the O2 sensor after the catalytic converter which is on the down side of the downpipe...

enrita · 08-17-2011, 06:12 PM

Quote:

Originally Posted by Elie335

oh my bad, its not the upper sensor, its the O2 sensor after the catalytic converter which is on the down side of the downpipe...

No think is the wideband sensor pre cat/closest to the turbo. The important one.

Luong · 08-17-2011, 06:31 PM

I had the exact same code reading off my JB4 which caused my car to run lean and the tune would actually turn itself off when I was on it. Had the o2 sensor replaced on bank 4 I believe?? No more CELs and I havn't had a code come up yet, car runs stronger and better now.

M3 Eater · 08-17-2011, 09:29 PM

See, I am thinking that I have been having this issue as well. I have an after cat code, says its not plugged in or something. I use a DP fix from BMS and it goes away. I remember the car being a lot stronger. I put in the dp fix for my inspection and I have been trying to figure out how vital this code is. Wish I still had the exact code #. I have to detach my dp fix to make it come up again.

I guess if I were going to invest some money in a sound running car, I would want to replace all these sensors? Or should I focus on the fronts? I still haven't got a solid grasp on o2 sensors and their function in relation to AFR.

Elie335 · 08-18-2011, 05:00 PM

Update:

Changed both O2 sensors on the DP for cyl 4-5-6, and the error is gone.

08-17-2011, 05:24 PM	#1
Elie335 ايلي ٣٣٥ هاهاها 88 Rep 1,448 Posts Drives: Vorsteiner e92 Join Date: Jun 2009 Location: Leb iTrader: (1)	o2 sensor code help Hello fellas; I've recently installed catless downpipes, and since then I always get the code 2C3E: 2C3E Lambda probe in front of catalytic converter 2, control failure or cable transmission failure? Any idea what's the cause of the error? I've searched, nothing explained why could be. Can someone please chime in and explain? Thanks __________________ Recent exterior modifications
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08-17-2011, 05:36 PM	#2
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Seems like the front lambda 2 has issues after the installation of the dps, maybe broken or reverted? I would check that first. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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08-17-2011, 05:40 PM	#3
e90328i Banned 25 Rep 386 Posts Drives: 07 E90 335i Join Date: May 2011 Location: socal iTrader: (4)	nothing to do with the 02 sensors or you would be getting codes like: p3026 & p0135
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08-17-2011, 06:06 PM	#8
Elie335 ايلي ٣٣٥ هاهاها 88 Rep 1,448 Posts Drives: Vorsteiner e92 Join Date: Jun 2009 Location: Leb iTrader: (1)	oh my bad, its not the upper sensor, its the O2 sensor after the catalytic converter which is on the down side of the downpipe... __________________ Recent exterior modifications
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08-17-2011, 06:31 PM	#10
Luong First Lieutenant 25 Rep 330 Posts Drives: M Join Date: Apr 2011 Location: So Cal iTrader: (3)	I had the exact same code reading off my JB4 which caused my car to run lean and the tune would actually turn itself off when I was on it. Had the o2 sensor replaced on bank 4 I believe?? No more CELs and I havn't had a code come up yet, car runs stronger and better now.
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08-17-2011, 09:29 PM	#11
M3 Eater Major 36 Rep 1,054 Posts Drives: 335i Sedan Join Date: May 2010 Location: Unknown iTrader: (3) Garage List 2007 335i [0.00]	See, I am thinking that I have been having this issue as well. I have an after cat code, says its not plugged in or something. I use a DP fix from BMS and it goes away. I remember the car being a lot stronger. I put in the dp fix for my inspection and I have been trying to figure out how vital this code is. Wish I still had the exact code #. I have to detach my dp fix to make it come up again. I guess if I were going to invest some money in a sound running car, I would want to replace all these sensors? Or should I focus on the fronts? I still haven't got a solid grasp on o2 sensors and their function in relation to AFR. __________________ JB4 beta 15 ohms FSB,AEM inline filter/ CM 10, ETS fmic, ER custom made charge pipe,TSW Donnington 18's,Simitumo HTRZ3, Injen DCI, AR DPs, Forge DVs, AA SLD, Koni FSD, ZSP springs.
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08-18-2011, 05:00 PM	#12
Elie335 ايلي ٣٣٥ هاهاها 88 Rep 1,448 Posts Drives: Vorsteiner e92 Join Date: Jun 2009 Location: Leb iTrader: (1)	Update: Changed both O2 sensors on the DP for cyl 4-5-6, and the error is gone. __________________ Recent exterior modifications
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