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What does this code mean and why does it keep reappearing?
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02-15-2016, 02:02 PM | #1 |
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What does this code mean and why does it keep reappearing?
2C7B Lambda probe behind catalytic converter, signal I just started getting it recently. I've done a couple of code resets but it keeps coming back so I'm thinking it might be an actual issue. I have not touched my O2 sensors since my downpipes were installed which was a long time ago. I've verified that they're installed correctly so it's not that. Anyone have an idea what it could be?
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2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
02-15-2016, 02:08 PM | #3 |
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How would I be able to identify exactly which one it is in order to replace it?
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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02-15-2016, 02:26 PM | #5 |
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First result when googling "2C7B BMW": http://www.e90post.com/forums/showthread.php?t=564145
"2C7B After cat o2 Sensor signal, Bank 1" I can't remember which one Bank 1 is, but that's what 2C7B is.
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02-15-2016, 03:18 PM | #6 | |
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Quote:
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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02-15-2016, 04:06 PM | #7 |
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In case you check this forum before n54tech: the one with o2 sensor #04.
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02-15-2016, 09:08 PM | #8 |
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I concur with jwalker. #1 and #4 sensors are for bank 1.
These don't break as often as precat sensors. With precat codes, they might be caused by injectors, plugs, coils, LPFP, HPFP. With postcat codes, it's usually the sensor itself |
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02-16-2016, 09:32 AM | #10 |
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Honestly, if you are over 60k miles and are going to replace the one side sensor you should just replace both banks and be done with it.
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02-16-2016, 08:52 PM | #12 | |||
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That's really helpful, thanks.
Quote:
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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02-16-2016, 09:24 PM | #13 | |
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The pre cat o2 sensors can be used on either bank though |
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02-17-2016, 12:40 AM | #14 |
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I'm getting the same code and my rear O2 sensors are new. Also getting the aging code for the same sensor. No fix yet.
I've heard it can be related to a poor connection at the DME. Have you recently done any work on or near the DME? I haven't so that's not my issue I don't think. |
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02-17-2016, 05:35 AM | #15 | ||
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Quote:
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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02-17-2016, 06:17 AM | #16 | |
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02-17-2016, 03:03 PM | #17 |
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Which ones specifically? Thanks
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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02-17-2016, 10:35 PM | #18 |
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02-18-2016, 01:15 AM | #19 |
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Also try reseting lambda adaptations. Hopefully it works for you.
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02-18-2016, 02:51 AM | #20 |
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I reset both along with octane (went to E85 map) and so far it hasn't returned. I may need to drive some more though.
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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03-09-2016, 04:44 PM | #21 |
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It came back. My new one also arrived so I'll be installing that today.
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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03-09-2016, 05:02 PM | #22 |
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