2C31

AndyW · 10-07-2019, 10:04 PM

2008 335i, N54. 165K miles. c-Pe high flow catted DPs (these will throw CEL's if not coded out). MHD stage 1 tune with OEM/catted DP's unchecked. O2 WB sensors replaced at 123K. No O2 issues since. I have read that other things can cause the code, such as the rear O2 sensors (thought they didn't matter with high flow/kittless DP's?) Any T/S recommendations before I just replace the WB's? TIA.

AndyW · 10-08-2019, 04:13 PM

Datalog from drive to work this AM. LTFT looks flatlined. https://datazap.me/u/andyw/08-335-n54-2c31-drive-work

AndyW · 11-16-2019, 07:02 PM

Replacing the bank 1 lambda sensor fixed it.

10-07-2019, 10:04 PM	#1
AndyW Supreme Galactic Commander (one galaxy over...) 718 Rep 1,787 Posts Drives: '08 E93, '12 E82, '13 E93 M3 Join Date: Feb 2012 Location: Washington, USA iTrader: (5)	2C31 - lambda code help 2008 335i, N54. 165K miles. c-Pe high flow catted DPs (these will throw CEL's if not coded out). MHD stage 1 tune with OEM/catted DP's unchecked. O2 WB sensors replaced at 123K. No O2 issues since. I have read that other things can cause the code, such as the rear O2 sensors (thought they didn't matter with high flow/kittless DP's?) Any T/S recommendations before I just replace the WB's? TIA. __________________ Best, Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune
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10-08-2019, 04:13 PM	#2
AndyW Supreme Galactic Commander (one galaxy over...) 718 Rep 1,787 Posts Drives: '08 E93, '12 E82, '13 E93 M3 Join Date: Feb 2012 Location: Washington, USA iTrader: (5)	Datalog from drive to work this AM. LTFT looks flatlined. https://datazap.me/u/andyw/08-335-n54-2c31-drive-work
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11-16-2019, 07:02 PM	#3
AndyW Supreme Galactic Commander (one galaxy over...) 718 Rep 1,787 Posts Drives: '08 E93, '12 E82, '13 E93 M3 Join Date: Feb 2012 Location: Washington, USA iTrader: (5)	Replacing the bank 1 lambda sensor fixed it.
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