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Setting O2 feedback on cells in the fuel-table works for off-idle only and also controls whether the ECU dynamically updates the 8x8 fuel trim maps stored in self-learn RAM**. Maxing out the activation temperature will effectively disable O2 feedback, but doesn't account for the coolant temp sensor being faulty. The safest/easiest way to disable it completely is with the bit-flag I mentioned; it's a simple on/off switch for the entire O2 feedback system.
* - software still in development
** - All of the big injector tunes that I've come across don't rescale the TP axis for these maps correctly (i.e. they leave it the same as for 370cc injectors), so these vehicles lose a chunk of their long term o2 trims.
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