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      03-08-2010, 02:03 PM   #1
trashcan
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p2096 and p2270 after firmware update

i have rr catless downpipes & o2 sim, and jb3 1.4 i have had these mods for over a year and have had very few problems, a couple of codes when the temperature was below zero, that always went away.

i recently had my injectors replaced under warranty (due to long cranking), and since then i have had these two codes, p2096 and p2270. my ecu firmware was also updated at the same time by bmw.

p2096 Post Catalyst Fuel Trim System Too Lean Bank 1
p2270 O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2

i checked the wiring on my rr o2 sim, and it was fine. i reset the codes after doing this, and then they reappeared immediately. i also upgraded to the newest control module for the jb3 (which upgraded me from jb1.3 to 1.4 as well) as a troubleshooting step, and that also did not help.

the car has a slightly rough idle when cold, and will occasionally stumble under very light throttle as well (like cruise control). i am running on map 0 currently, and these code are still being thrown.

i am not sure what else i can do. i have just ordered a bms o2 sim, maybe that will fix the problem. does anyone else have any other ideas? thank you.
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      03-11-2010, 03:44 PM   #2
trashcan
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any input? also i was wrong, i upgraded from jb3 1.3 to 2.0beta, not to 1.4.
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      03-23-2010, 02:02 PM   #3
trashcan
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I think I am getting closer to solving this, it does appear to all be o2 sim related.

I have purchased-

upgraded jb3 control box ($110-50 core charge)
replacement bms o2 simulator ($85)
BT scan tool ($300)

i am now fine tuning it, last adjustment i went 80 miles without a check engine light.. so i guess i am making progress but it cost a lot more than i thought it would.
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