Bank 2 running too lean: p0174. Only mod is catback exhaust - BMW 3-Series (E90 E92) Forum

wren57 · 01-03-2013, 04:27 PM

A catback wouldn't effect this, would it? Figured since sensor is upstream it wouldn't matter.

Anything I can do to troubleshoot this before replacing the sensor? If I install the Procede on the shelf would it be ok? I know it gets rid of lean o2 sensor errors, but isn't this something I should fix first instead of just covering up?

All help appreciated!

jpsimon · 01-03-2013, 05:00 PM

couldn't hurt to post a log

sickem · 01-04-2013, 07:29 AM

what sensor are you proposing to replace, oxygen sensors? I would get it sorted before running procede. Being tuned and demanding more fuel /timing is only going to exacerbate the problem. Or as jp suggested post a log...first in map 0.

Edit: as you said, getting rid of codes doesn't get rid of inherent problems.

wren57 · 01-04-2013, 10:14 AM

Quote:

Originally Posted by sickem

what sensor are you proposing to replace, oxygen sensors? I would get it sorted before running procede. Being tuned and demanding more fuel /timing is only going to exacerbate the problem. Or as jp suggested post a log...first in map 0.

Edit: as you said, getting rid of codes doesn't get rid of inherent problems.

Yeah I would be replacing the o2 sensors on that side to see if they were faulty. That's just a PITA and somewhat expensive.

cn555ic · 01-04-2013, 10:30 AM

2 sensors would set you back Alot of money if that is not the underlining issue. Logs would help for sure

sickem · 01-04-2013, 11:51 AM

Quote:

Originally Posted by wren57

Yeah I would be replacing the o2 sensors on that side to see if they were faulty. That's just a PITA and somewhat expensive.

Quote:

Originally Posted by cn555ic

2 sensors would set you back Alot of money if that is not the underlining issue. Logs would help for sure

yes, I just spent $450 on them; 150 for install and 150 for each sensor! there are universal sensors you can use that are cheaper though. mine was definitely oxygen sensors though; I knew that going in. I was getting actual lambda sensor codes. cn555ic is right...log first before throwing parts at the car.

eric@helix · 01-04-2013, 11:58 AM

Was the code for Senor #1 or Sensor #2?

sickem · 01-04-2013, 03:13 PM

Quote:

Originally Posted by eric@helix

Was the code for Senor #1 or Sensor #2?

if you are asking the OP, then my apologies. I was getting 2c32 11314 Lamba probe in front of cat 2, trimming control and 2c6b 11371 2C6B Lambda probe behind catalytic converter, system check

01-03-2013, 04:27 PM	#1
wren57 Major Drives: 335i Join Date: Jul 2010 Location: Birmingham, AL Posts: 1,370 iTrader: (8)	Bank 2 running too lean: p0174. Only mod is catback exhaust A catback wouldn't effect this, would it? Figured since sensor is upstream it wouldn't matter. Anything I can do to troubleshoot this before replacing the sensor? If I install the Procede on the shelf would it be ok? I know it gets rid of lean o2 sensor errors, but isn't this something I should fix first instead of just covering up? All help appreciated!
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01-04-2013, 07:29 AM	#3
sickem Freude am fahren Drives: in the fast lane Join Date: Mar 2010 Location: People's Republic of New Jersey Posts: 1,668 iTrader: (4) Garage List 2008 BMW 335i E90 [3.10]	what sensor are you proposing to replace, oxygen sensors? I would get it sorted before running procede. Being tuned and demanding more fuel /timing is only going to exacerbate the problem. Or as jp suggested post a log...first in map 0. Edit: as you said, getting rid of codes doesn't get rid of inherent problems. __________________ Cobb AP/RR catless DPs/aFe DCI/ETS 5" FMIC/Alpina B3 TCU flash/BMW Performance Wheels

01-04-2013, 10:30 AM	#5
cn555ic The Coding Guy Drives: FBO 335i Vert meth/nitrous Join Date: Jun 2007 Location: Brooklyn, New York Posts: 17,874 iTrader: (5)	2 sensors would set you back Alot of money if that is not the underlining issue. Logs would help for sure __________________ *CODING BMWs in N.Y Area 917-939-4980* Call or Text for more INFO

01-04-2013, 11:58 AM	#7
eric@helix BimmerPost Supporting Vendor Drives: 01 M Coupe, 08 135i, '12 328i Join Date: Jul 2007 Location: Philadelphia Posts: 719 iTrader: (0)	Was the code for Senor #1 or Sensor #2? __________________

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01-03-2013, 05:00 PM	#2
jpsimon Team Zissou Drives: 335xi Coupe 6MT Join Date: Dec 2006 Location: CT Posts: 8,796 iTrader: (3)	couldn't hurt to post a log __________________ PROcede+Cobb, thule flat-top 6 ski rack, VTT Stg.2 Turbos, PWM meth + ADVAN in-boot meth tank, AMS fmic, catless (ur+ae), SPEC clutch/flywheel, KW V3 coilovers, etc etc etc...