O2 sensor question

GAM · 06-29-2013, 07:58 AM

Hello everyone,

I have been having the 2c9c code coming up on every start this week and my car is running really lean.
2C9C: Lambda Sensor Heater Pre Cat 1
Does that mean the faulty one is the front O2 sensor on the left downpipe (driver side)?

Thanks for your help

GAM · 07-03-2013, 12:33 PM

The answer is Yes, just changed it last weekend.
Front O2 sensor near the turbo and on the driver side

cleex024 · 07-03-2013, 12:39 PM

damn im getting the bank 2 o2 sensor going bad...was hoping it was just going to go away but its definitely not going away lol.

is changing o2 sensor going to be a bitch?

dirtmaster666 · 07-03-2013, 04:34 PM

Quote:

Originally Posted by cleex024

damn im getting the bank 2 o2 sensor going bad...was hoping it was just going to go away but its definitely not going away lol.

is changing o2 sensor going to be a bitch?

Yes. Unless you have skinny arms or move your steering rack

hankcah · 07-17-2013, 08:17 PM

How much would replacing the 2C2E and 2C3E cost? parts and labor?

DR-JEKL · 07-21-2013, 04:40 AM

Quote:

Originally Posted by hankcah

How much would replacing the 2C2E and 2C3E cost? parts and labor?

o2 sensors take around 2 hrs labour to replace, and can be had for around $100 each.

So around $400 based on my experience.

psmitty95 · 07-21-2013, 10:53 AM

Quote:

Originally Posted by cleex024

damn im getting the bank 2 o2 sensor going bad...was hoping it was just going to go away but its definitely not going away lol.

is changing o2 sensor going to be a bitch?

Are you noticing any other symptoms? I've been getting SES lights with boost not going over 10 PSI for a while along with some misfires. Terry is convinced it's o2 sensors since I also am running lean despite timing being perfect. Thing that sucks is I just replaced the rears a few weeks ago and now i'm getting a rear code again...

cleex024 · 07-21-2013, 08:51 PM

Quote:

Originally Posted by psmitty95

Are you noticing any other symptoms? I've been getting SES lights with boost not going over 10 PSI for a while along with some misfires. Terry is convinced it's o2 sensors since I also am running lean despite timing being perfect. Thing that sucks is I just replaced the rears a few weeks ago and now i'm getting a rear code again...

Actually everything seems to be running pretty well except for slight hiccupsat idle...I'm still going to change it the o2 sensors eventually but I wanna know if I should go ahead and replace both and how hard it's going to be

psmitty95 · 07-21-2013, 09:01 PM

Quote:

Originally Posted by cleex024

Actually everything seems to be running pretty well except for slight hiccupsat idle...I'm still going to change it the o2 sensors eventually but I wanna know if I should go ahead and replace both and how hard it's going to be

Have you done any logs? Mine seemed to be running fine and even looked fine in logs but when I plug the logs into VD it makes much less power than it used too and its not pulling nearly as strong

sickem · 07-22-2013, 02:06 PM

Quote:

Originally Posted by psmitty95

Are you noticing any other symptoms? I've been getting SES lights with boost not going over 10 PSI for a while along with some misfires. Terry is convinced it's o2 sensors since I also am running lean despite timing being perfect. Thing that sucks is I just replaced the rears a few weeks ago and now i'm getting a rear code again...

you replaced the rear oxygen sensors, you mean secondaries? My understanding was that those didn't have anything to do with AFRs and only measure catalytic efficiency...not sure if I'm mistaken?

psmitty95 · 07-22-2013, 02:15 PM

Quote:

Originally Posted by sickem

you replaced the rear oxygen sensors, you mean secondaries? My understanding was that those didn't have anything to do with AFRs and only measure catalytic efficiency...not sure if I'm mistaken?

Yea that was my understanding also but those are the ones i'm getting a code for and what terry told me to do. Still getting codes and running lean despite timing being perfect. I think i'm going to do all 4 o2's next and see what happens per Terry's recommendation

sickem · 07-22-2013, 02:22 PM

Quote:

Originally Posted by psmitty95

Yea that was my understanding also but those are the ones i'm getting a code for and what terry told me to do. Still getting codes and running lean despite timing being perfect. I think i'm going to do all 4 o2's next and see what happens per Terry's recommendation

hmm, sounds more like a fueling issue...lpfp/hpfp or injectors?

psmitty95 · 07-22-2013, 02:24 PM

Quote:

Originally Posted by sickem

hmm, sounds more like a fueling issue...lpfp/hpfp or injectors?

That's what I thought but everything looks fine in logs. Logs look perfect except for running lean and the car not putting out as much power on VD or during pulls with friends. The rear cat #2 code is the one that keeps popping up whenever I get the SES light so he thinks its that.

sickem · 07-22-2013, 02:25 PM

Quote:

Originally Posted by psmitty95

That's what I thought but everything looks fine in logs. Logs look perfect except for running lean and the car not putting out as much power on VD or during pulls with friends. The rear cat #2 code is the one that keeps popping up whenever I get the SES light so he thinks its that.

ok, well GL keep us updated...that's weird.

psmitty95 · 07-22-2013, 02:26 PM

Quote:

Originally Posted by sickem

ok, well GL keep us updated...that's weird.

Yea it's bizarre. Here's a thread I made about the issues a while back if you are bored and feel like reading through it

http://www.e90post.com/forums/showthread.php?t=833724

UsedF10M5 · 03-09-2015, 12:57 AM

Quote:

Originally Posted by GAM

The answer is Yes, just changed it last weekend.
Front O2 sensor near the turbo and on the driver side

Upstream on the driver's side? Bank 1 Sensor 1?
Some are saying in front of the cat on bank 1... Maybe my terminology is just off.

06-29-2013, 07:58 AM	#1
GAM Lieutenant 39 Rep 471 Posts Drives: 2014 M6 Gran Coupe Join Date: Mar 2012 Location: Palm Beach iTrader: (1)	O2 sensor question Hello everyone, I have been having the 2c9c code coming up on every start this week and my car is running really lean. 2C9C: Lambda Sensor Heater Pre Cat 1 Does that mean the faulty one is the front O2 sensor on the left downpipe (driver side)? Thanks for your help
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07-03-2013, 12:39 PM	#3
cleex024 Lieutenant Colonel 104 Rep 1,529 Posts Drives: 2008 BMW 335i Coupe Join Date: Mar 2011 Location: Woodbridge iTrader: (2)	damn im getting the bank 2 o2 sensor going bad...was hoping it was just going to go away but its definitely not going away lol. is changing o2 sensor going to be a bitch? __________________ Space Gray l 6MT l OSG LSD w/ VAC Race Diff Cover l Cobb e30 l Morr vs8.2 l UUC SSK w/ DSSR l VSRF Catless Dps l RPI Intercooler l CDV Removed l HID AE 8000k l ETS Catback l AST 5200 w/ Vorshlag Camber Plates l ER Dual Oil Coolers l Rear Camber and Toe Arms l K&N Drop In l Solid Tranny/Diff/Subframe Bushings l Bridgestone RE-11
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07-17-2013, 08:17 PM	#5
hankcah First Lieutenant 43 Rep 364 Posts Drives: BMW 335i E90 Join Date: Jun 2010 Location: Saint Louis iTrader: (0) Garage List 2007 335i [0.00]	How much would replacing the 2C2E and 2C3E cost? parts and labor?
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07-03-2013, 12:33 PM	#2
GAM Lieutenant 39 Rep 471 Posts Drives: 2014 M6 Gran Coupe Join Date: Mar 2012 Location: Palm Beach iTrader: (1)	The answer is Yes, just changed it last weekend. Front O2 sensor near the turbo and on the driver side
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