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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > 2c7e Lambda probe Error

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      11-07-2011, 10:40 AM   #1
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2c7e Lambda probe Error

Currently I have a 2008 335i with the following mods:

ets intercooler
ar design catted down pipes
ae cat back exhaust
bms dci

The car seemed to just not be running 100%, so I started to check and see if I could notice an difference while idling and reviing up the engine. I didn't really notice anything at first. But once I quicly revved up the engine to about 4000-5000 rpm I go a lot of white smoke out of the exhaust. I was able to reproduce this several times. I checked the error codes int he computer and the only one listed was:

2c7e Lambda probe behind catalytic converter, trimming control

From what I gather this is related to the Bank 1 o2 sensor after the catalytic converter. I then ran INPA and checked them and Bank 1 o2 sensor does seem to be having issues, but I am not sure what the readings should be. Attached is a picture of the readings I got from IPNA.

The bank 1 after cat o2 shows very low voltage, however when I rev up it does go up, but on idle it stays about 0.00 to 0.07 voltage. Whereas the bank 2 one stays about .6 to .7 voltage.

Does anyone know for sure if that means that the bank 1 o2 sensor is bad and that I need to replace it? Any help or insight would be awesome. Thank you.

Last edited by crasher381; 11-07-2011 at 10:41 AM. Reason: Link broken
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      07-19-2012, 12:35 PM   #2
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Did you find any solution to this? I am getting the same code.
Not sure if you replaced bank 1 02 after cat, but if so, did it fix it?
Are you getting bad mileage?
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      07-19-2012, 11:01 PM   #3
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Make sure you have the correct o2 sensor in the right pipe. The one with the grey wire should be going into the pipe in the passenger side.
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      06-17-2017, 09:02 PM   #4
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Hey there...sorry to ressurect the thread but Iím having similar issues with my car. I got the 2C7E error for the bank 1 post cat o2 sensor failure even after replacing the sensor.

Does anyone Have a clue on to what else the issue could be?
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