BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST - View Single Post - Lean/Oxygen sensor trouble shooting (F-series N55)

harkes · 11-24-2016, 10:41 PM

Hi guys

The other day I had an incident where trims did not respond and my car went lean during a JB4 log. I was told this is because the car went into open-loop caused by a defect oxygen sensor. There was no CEL.
Now, how do I trouble shoot this? How to test if the oxygen sensor is defect and which one it is? I find it hard to believe that something so advanced as the F-series does not throw a code for a faulty O2 sensor?

11-24-2016, 10:41 PM	#1
harkes Colonel 1078 Rep 2,358 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	Lean/Oxygen sensor trouble shooting (F-series N55) Hi guys The other day I had an incident where trims did not respond and my car went lean during a JB4 log. I was told this is because the car went into open-loop caused by a defect oxygen sensor. There was no CEL. Now, how do I trouble shoot this? How to test if the oxygen sensor is defect and which one it is? I find it hard to believe that something so advanced as the F-series does not throw a code for a faulty O2 sensor? Attached Images __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China) Last edited by harkes; 11-24-2016 at 11:07 PM..
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