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BMW 3-Series (E90 E92) Forum
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O2 codes
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06-07-2010, 04:33 PM | #1 |
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O2 codes
I am constantly getting these codes, tried to do reset adaptation but they wont go away (also got a Engine Cell once) . If they are only O2 sims related i dont mind but i wonder if one of the front lambda could be misreading and messing with my afr ratio somehow.
2C7E: 2C7E Lambda probe behind catalytic converter, trimming control Error will cause a warning light Error is not currently present Test conditions have been completed Signal or value below threshold Freeze Frame Information Event 1Odometer 64856kms 40299miles voltage Lambda probe behind catalytic converter bank 1 0.04 V voltage Lambda probe in front of catalytic converter bank 1 1.74 V Lambda shifting return valve 1 0.00 - input signal return valve 1 0.00 V Event 2Odometer 65136kms 40473miles voltage Lambda probe behind catalytic converter bank 1 0.04 V voltage Lambda probe in front of catalytic converter bank 1 1.82 V Lambda shifting return valve 1 0.00 - input signal return valve 1 0.00 V Event 3Odometer 65248kms 40543miles voltage Lambda probe behind catalytic converter bank 1 0.10 V voltage Lambda probe in front of catalytic converter bank 1 1.93 V Lambda shifting return valve 1 0.00 - input signal return valve 1 0.00 V 2C6C: 2C6C Lambda probe behind catalytic converter 2, system check Error will cause a warning light Error is not currently present Test conditions have been completed Signal or value below threshold Freeze Frame Information Event 1Odometer 64864kms 40304miles voltage Lambda probe in front of catalytic converter bank 2 1.50 V resistor Lambda probe behind catalytic converter bank 2 512.00 ohm Engine speed 1,504.00 rpm voltage Lambda probe behind catalytic converter bank 2 0.63 V 2C6A: 2C6A Lambda probe behind catalytic converter, muddled Error will cause a warning light Error is not currently present Test conditions have been completed Freeze Frame Information Event 1Odometer 65144kms 40478miles Engine temperature 93.75 ∞C time since start end 435.20 s voltage Lambda probe behind catalytic converter bank 1 0.04 V voltage Lambda probe behind catalytic converter bank 2 0.63 V 2C7E: 2C7E Lambda probe behind catalytic converter, trimming control Error will cause a warning light Error is not currently present Test conditions have been completed Signal or value below threshold Freeze Frame Information Event 1Odometer 64624kms 40155miles voltage Lambda probe behind catalytic converter bank 1 0.02 V voltage Lambda probe in front of catalytic converter bank 1 1.89 V Lambda shifting return valve 1 0.00 - input signal return valve 1 0.00 V Event 2Odometer 64760kms 40239miles voltage Lambda probe behind catalytic converter bank 1 0.00 V voltage Lambda probe in front of catalytic converter bank 1 1.97 V Lambda shifting return valve 1 0.00 - input signal return valve 1 0.00 V 2C6A: 2C6A Lambda probe behind catalytic converter, muddled Error will cause a warning light Error is not currently present Test conditions have been completed Freeze Frame Information Event 1Odometer 64632kms 40160miles Engine temperature 102.75 ∞C time since start end 1,561.60 s voltage Lambda probe behind catalytic converter bank 1 0.02 V voltage Lambda probe behind catalytic converter bank 2 0.33 V Event 2Odometer 64760kms 40239miles Engine temperature 101.25 ∞C time since start end 768.00 s voltage Lambda probe behind catalytic converter bank 1 0.04 V voltage Lambda probe behind catalytic converter bank 2 0.61 V
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11-08-2012, 06:36 PM | #3 |
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I get same codes. Are O2 sensors bad??
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11-08-2012, 06:46 PM | #4 |
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11-09-2012, 09:03 AM | #5 |
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Had problems with these - somehow after multiple trips to dealer without solution, they ended up cleaning the intake ports/walnut blasting, and this has removed the errors. Haven't had the codes trip for a month (previously, it would trip 1-2 times a week).
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11-09-2012, 09:16 AM | #6 | |
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11-09-2012, 12:09 PM | #7 |
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2C7B / 2C7C
They would trip in aggressive throttle input at higher gears (higher load/low rpm), causing CEL occasionally. When it would trip, there would be a sudden bog of the vehicle, and if the CEL was thrown, there would be reduced power. Last edited by anerbe; 11-09-2012 at 01:01 PM.. |
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11-09-2012, 04:04 PM | #8 | |
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Drives: 2022 F97 X3M Comp LCI
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Quote:
Recently, I've been getting similar codes as you (trimming, line test, shear test, etc. etc.). The O2 values on both banks were pretty much identical with no read issues. From what I assume, these shouldn't be related to the pre-cat O2 sensors. As I had mentioned earlier, I replaced a faulty one recently, and I can't imagine it to go bad again in such a short period of time. I've been clearing the codes + resetting adaptations every so often. The car has been driving perfectly with no issues, so at this point, I'm not sure of any solution. Source? I always assumed that the post-cats had nothing to do with the problems above, so I never bothered with taking out the O2 sims. If what you say is the case, O2 sims may be the culprit.
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11-10-2012, 01:04 AM | #9 | |||
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Shiv said it himself... Quote:
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