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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 > "2C31" Engine Code Help



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      11-11-2017, 03:52 AM   #1
ArweenX1
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Replaced both Upstream O2 Sensors before the cats, located on the downpipes. Still throwing lean code "2C31"..... possibly both O2 Sensors after cats have to be replaced as well? Any one had similar issues? Any info is much appreciated

Parts just installed:
BOSCH 17098
BOSCH 17102
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      02-23-2018, 08:41 AM   #2
e46m3to335i
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Quote:
Originally Posted by ArweenX1 View Post
Replaced both Upstream O2 Sensors before the cats, located on the downpipes. Still throwing lean code "2C31"..... possibly both O2 Sensors after cats have to be replaced as well? Any one had similar issues? Any info is much appreciated

Parts just installed:
BOSCH 17098
BOSCH 17102
Any update to your issue? I'm having the same issue.

-Nick
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      02-23-2018, 10:18 AM   #3
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Bad injector can cause o2 code. Check your Sparks for leaky fuel. Also do a smoke test.
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      02-23-2018, 03:26 PM   #4
ArweenX1
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Quote:
Originally Posted by e46m3to335i View Post
Quote:
Originally Posted by ArweenX1 View Post
Replaced both Upstream O2 Sensors before the cats, located on the downpipes. Still throwing lean code "2C31"..... possibly both O2 Sensors after cats have to be replaced as well? Any one had similar issues? Any info is much appreciated

Parts just installed:
BOSCH 17098
BOSCH 17102
Any update to your issue? I'm having the same issue.

-Nick
Rear 02s post cat replaced fixed the issue
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      02-23-2018, 04:11 PM   #5
e46m3to335i
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Quote:
Originally Posted by ArweenX1 View Post
Quote:
Originally Posted by e46m3to335i View Post
Quote:
Originally Posted by ArweenX1 View Post
Replaced both Upstream O2 Sensors before the cats, located on the downpipes. Still throwing lean code "2C31"..... possibly both O2 Sensors after cats have to be replaced as well? Any one had similar issues? Any info is much appreciated

Parts just installed:
BOSCH 17098
BOSCH 17102
Any update to your issue? I'm having the same issue.

-Nick
Rear 02s post cat replaced fixed the issue
Thanks for confirming!!!!!! Hopefully that fixes my code as well.
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2009 E82 135i: M6 / Alpine White / M-Sport / MHD Stage 1 / Kittyless DP's / DCI's / Performance Exhaust / Blackline Tails / CDV Mod / BMS PCV / Gloss Black Grilles
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      02-24-2018, 11:49 AM   #6
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Quote:
Originally Posted by ArweenX1 View Post
Replaced both Upstream O2 Sensors before the cats, located on the downpipes. Still throwing lean code "2C31"..... possibly both O2 Sensors after cats have to be replaced as well? Any one had similar issues? Any info is much appreciated

Parts just installed:
BOSCH 17098
BOSCH 17102
The downstream o2 sensors, after the cats, only monitor the upstream cats to make sure they are working. They do not measure anything.

Bosch 16413 & 16414 will replace them for a fraction of the cost the "BMW" ones cost.
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