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Posts: 425
Join Date: Apr 2013
Car: 335i 2007 6spdman
Default Bank O2 sensors affecting opposite trums - 09-28-2020, 04:56 AM

On the single turbo firmware when I pull bank 1 O2 sensor bank 2 fuel trims are affected/ pegged and stay ar 25 but bank 1 fuel trims are still working and fluctuating like normal.
and vice verser. When I remove bank 2 O2 sensor bank 1 fuel trims are affected/pegged at 25 not moving.

Car runs fine.
idles perfect, wot perfect, port injection perfect ect.


When I swap the O2 banks over so bank 1 afr refers to bank 1 trims it wont idle properly. The trims on bank 1 and 2 go opposite rich and lean and ecu goes into a closed loop idle and it throws pre and post *** codes.

Even if I reflash and reset o2 adaptions it will not idle and goes into closed loop after 15 seconds or so.

Why are bank 1 O2 sensor AFR controlling bank 2 trims?
Why when I change the bank 1 and 2 O2 sensor bungs so they correlate to the correct bank they act like they are in the wrong bank.?


Why is bank 1 afr refer to bank 2 fuel trims?
Why are they backwards?

Car runs fine in all operation its just strange that the bank 1 afr is for bank 2 fuel trims and bank 2 afr is bank 1 fuel trim.
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brendan brendan is offline
Brendan
 
Posts: 425
Join Date: Apr 2013
Car: 335i 2007 6spdman
Default 09-29-2020, 04:25 AM

Why is bank 1 O2 sensor feeding data for bank 2 fuel trims?
Why is bank 2 O2 sensor referring or feeding data for bank 1 fuel trims?

This is pretty messed up whats going on?
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