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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Bank 2 running too lean: p0174. Only mod is catback exhaust



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      01-03-2013, 05:27 PM   #1
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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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      01-03-2013, 06:00 PM   #2
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couldn't hurt to post a log
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      01-04-2013, 08:29 AM   #3
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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.
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      01-04-2013, 11:14 AM   #4
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Quote:
Originally Posted by sickem View Post
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.
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      01-04-2013, 11:30 AM   #5
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2 sensors would set you back Alot of money if that is not the underlining issue. Logs would help for sure
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      01-04-2013, 12:51 PM   #6
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Quote:
Originally Posted by wren57 View Post
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.
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Originally Posted by cn555ic View Post
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.
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      01-04-2013, 12:58 PM   #7
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Was the code for Senor #1 or Sensor #2?
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      01-04-2013, 04:13 PM   #8
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Originally Posted by eric@helix View Post
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
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