10-09-2021, 07:02 PM | #1 |
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O2 sensor codes
Chasing down the cause of an active CEL for the front o2 sensor. I've been able to get voltage reading for the sensor using BimmerLink, but I'm not versed enough to understand what the voltage reading is against it's resistance.
I logged a 3-2-3-4 run today to see if anything appears in the logs. Running a non-guaranteed catted dp, Vrsf competition IC, and Mhd 2+ 93oct. Log and code attached https://datazap.me/u/logicoeur/10-9?...#38;zoom=0-353 Googling the specific code and text, I have found users with loose o2 connectors on installation, or just come to the conclusion they have to replace the sensor. It's not a cat efficiency code. I keep clearing it and it returns on the next start. Connectors are correctly plugged and secure (triple checked). Is anyone able to tell from the datazap whether it is indeed a bad wideband sensor?
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10-09-2021, 11:48 PM | #2 |
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02 is unplugged or there isna break in the wire(s)
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10-10-2021, 09:46 PM | #3 |
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This is what my buddy and my own google searching indicates. I unplugged and plugged it a few times, even attempted to swap the two plugs just to rule out installation. However those Germans thought of everything because they are keyed one way.
I guess I do have to get a new o2 sensor installed . The stack of maintenance receipts is growing.
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10-11-2021, 03:19 AM | #4 | |
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10-11-2021, 11:36 AM | #5 |
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It's hard to tell anything from the log because at part throttle your target AFR is constant but your fuel trims don't move. I would also suggest it is the O2 sensor or its wiring.
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10-11-2021, 11:46 AM | #6 |
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This is what I was looking for. I believed that there was some stream or function of streams that would indicate something is wrong with input from the sensor. From the docs it did say when the sensor fails the DME falls back to a constant value as a failsafe or something or other. Cool!
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10-11-2021, 12:13 PM | #7 | |
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so it didn't matter if the log showed anything, it needs to be replaced.
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10-11-2021, 12:26 PM | #8 | |
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10-11-2021, 12:35 PM | #9 | ||
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OP, I'd drive it as little as possible till you get it fixed.
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10-11-2021, 12:41 PM | #10 | ||
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10-11-2021, 12:42 PM | #11 |
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Yeah looks like he is running open loop. It's probably conservatively rich (usually fuel tables are) but definitely wouldnt do WOT pulls or anything.
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10-12-2021, 10:16 AM | #12 | |
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https://f30.bimmerpost.com/forums/sh....php?t=1784694 |
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10-12-2021, 10:20 AM | #13 | |
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10-12-2021, 10:22 AM | #14 |
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Part is ordered and on the way from FCP. If it happens again; life time warranty. Scheduled to replace it this Friday. Hopefully it makes the tune feel more powerful. Right now I feel like I am back at stock power/torque after going FBO on my pwg. Felt like a waste of a few grand
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10-12-2021, 11:30 AM | #15 | |
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10-19-2021, 09:06 PM | #16 |
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Update:
Car feels much stronger now. Not noticing the lag as much anymore with the new wideband o2 sensor. Will take another log and compare.
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10-20-2021, 08:53 AM | #17 |
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10-20-2021, 08:56 AM | #18 |
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Assuming from the factory. No idea if the prev owner ever changed it. 2013 build date, 86K mi. It happened after downpipe install so likely was moving it around that severed a wire somewhere we can't see.
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10-21-2021, 10:29 AM | #19 |
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High way on ramp from a light. 1-2-3-4-3-4-5.
The 4-3 is after the on-ramp apex. https://datazap.me/u/logicoeur/1021-...-9-10-16-19-20 Seems and feels a lot better than before. The afr definitely move much higher when I'm on the throttle hard. I guess that is expected. Didn't know the readings would get so high like that though.
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10-21-2021, 10:42 AM | #20 | |
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Anyways, the good news is LTFTs and STFTs seem to be moving as they should now, and AFR is tracking target. It's easier to see the AFR tracking if you trim the very end of the log off where the AFRs spike super high off throttle. |
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10-21-2021, 10:44 AM | #21 | ||
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