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Kish2604 Kish2604 is offline
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Posts: 185
Join Date: Aug 2013
Car: E92 335i
Default The definitive O2 sensor thread - 08-31-2014, 02:54 PM

Hi guys... Was hoping to create this thread as a central point of information regarding the o2 sensors on all ranges of the E and F series cars that can have a JB installed,

Hopefully BMS and the other gurus will fill this thread with info based on how the o2 system works, the purpose of the the pre and post sensors and the diff values they log, the codes typically associated when a sensor fails and associated symptoms one could experience.

This thread is conceived to help a lot of first time users of a tune like the jb troubleshoot and understand the system that the jb heavily relies on for safety and why their newly tuned car is defaulting to map 4 after installing the tune, remember the standard dme doesn't have a map 4 safety to default to when running lean so the car could be leaning out for some time previously to the tune.


|RB old gen|Jb4 G5|3" DP's|ER Competition Cooler|ER Charge pipe|Tial BOV|CM Meth Kit|Dual nozzle setup|BMS cowl filters|AFE intakes+scoops|
|BMS low temp oil thermo|MHD flash + coding|HnR Springs|M3 Control arm kit + H&R + Koni|LED Angel eyes+plate lights
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