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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 > AFR issues, STFT not adjusting, persistent O2 codes. Halp.



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      03-30-2017, 05:14 PM   #1
MJ80.
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AFR issues, STFT not adjusting, persistent O2 codes. Halp.

Hey guys

Been having some persistent o2 codes appear for some time now. They almost always occur after cruising at low rpm for a min or so directly after a short WOT. Car runs MHD stage 2.

The codes are

2c31 lambda probe in front trimming control
2c28 lambda probe in front system check

And less regularly

2c6b lambda probe behind

It should be noted that performance is always seemingly unaffected and that i have replaced all 6 injectors with brand new ones. Clearing adaptations has no effect. After clearing the codes they usually return a day later under the same conditions.

Here is a log for you all to review i would appreciate any and all insight.

http://www.datazap.me/u/mj80/log-149...15-16-21-22-23

Last edited by MJ80.; 03-30-2017 at 05:19 PM.
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      03-30-2017, 05:54 PM   #2
FCobra94
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Yeah, looks like you're running very lean. STFT1 is "stuck" which isn't good and likely a contributor to the problem.

I'm assuming you properly coded the new injectors, correct?

What happens if you uninstall MHD? Same results?

Since clearing adaptations does nothing, I'd say it's time to replace both pre-cat O2s, at a minimum, then pull another log.

Mods? Do you have downpipes? If so, O2s might have gotten banged up during uninstall/reinstall.

What do LTFTs look like?
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'07 E90 335i - Automagic - Non-sport
MHD|Alpina Flash|Fuel It! Stg 2|VRSF:7"FMIC-DP-CP|TIAL BOV|cp-e DCI
Bilstein B6|E93 M3 FSB|SP Lowering Perches|M3 LCA|M3 Guide Rods|HPS 5.0
Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/15 F/R spacers
Winter: Style 159 - 17x8 ET34 - Michelin X-Ice Xi2 225/50/17 - 10/15 F/R spacers
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      03-30-2017, 06:26 PM   #3
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Quote:
Originally Posted by FCobra94 View Post
Yeah, looks like you're running very lean. STFT1 is "stuck" which isn't good and likely a contributor to the problem.

I'm assuming you properly coded the new injectors, correct?

What happens if you uninstall MHD? Same results?

Since clearing adaptations does nothing, I'd say it's time to replace both pre-cat O2s, at a minimum, then pull another log.

Mods? Do you have downpipes? If so, O2s might have gotten banged up during uninstall/reinstall.

What do LTFTs look like?
I made a point of insisting that the injectors be coded and i trust my mechanic. It should be noted that these issues were occurring before the new injectors were installed, injectors were my first step in fixing it and its still there.

Ill flash back to stock and see if is the same.

I have catless DPs, they were fitted about 6 months ago, these codes popped up 3 or 4 months after the install.

Id have to do another log to log LTFT it seems.
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      03-30-2017, 07:01 PM   #4
FCobra94
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Quote:
Originally Posted by MJ80. View Post
I have catless DPs, they were fitted about 6 months ago, these codes popped up 3 or 4 months after the install.
O2s are likely your problem then. Since you've gotten a code for one of the post cat sensors already, might as well swap out all 4 now and get it over with.

Until then, I wouldn't even think of going WOT.
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'07 E90 335i - Automagic - Non-sport
MHD|Alpina Flash|Fuel It! Stg 2|VRSF:7"FMIC-DP-CP|TIAL BOV|cp-e DCI
Bilstein B6|E93 M3 FSB|SP Lowering Perches|M3 LCA|M3 Guide Rods|HPS 5.0
Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/15 F/R spacers
Winter: Style 159 - 17x8 ET34 - Michelin X-Ice Xi2 225/50/17 - 10/15 F/R spacers
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      03-30-2017, 09:24 PM   #5
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Righto thanks for the help bud, they arent cheap when theres 4 + labor haha.
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