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      05-19-2017, 12:48 PM   #1
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3 strange codes out of nowhere. trouble diagnosing???

Not sure if this is the right forum, but im havimg a strange issue and was wondering if anyone else has had it...

Lambda Probe pre cat short to ground

Lambda Probe post cat short to ground

Terminal 15_N1 CAIS

Not getting an 02 reading it's staying at 14.7 no matter what? replaced primary 02, no change...Flashed car to stock and removed jb4...used ohm meter and continuity to check o2s and no short to ground....no ground in harness either...

car runs fine, obviously at wot, car works on open loop so it does t seem to affect performance but worries me that when in closed loop I could cause damage...

thinking DME damage? anyone experience this or have advice?
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      05-20-2017, 09:34 AM   #2
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DME damage seems unlikely. Did the code come back? If so could just be o2 sensor related.
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      05-20-2017, 11:47 AM   #3
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I replaced pre cat 02, and tested secondary o2 with continuity tester, no short to ground. Not getting short in harness either which is what scares me...whats unusual is the primary o2 reading is stuck at 14.6-14.7....

dme commanded lambda fluctuates properly. but I'm not sure if bmw utilizes 02 at all in open loop for minor corrections...but in open loop it's causing it to run rich bc the 14.7 the car thinks it's too lean under load n dumping fuel causing a rich mixture code sometimes
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      05-21-2017, 03:35 AM   #4
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Is there a chance this is in the wrong forum?
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      05-25-2017, 07:36 AM   #5
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I didn't know where else to put it
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