Turning off SES from 273A code

bmwlover0725 · 04-21-2017, 09:03 AM

I recently got my catless tune. All of my monitors set yesterday except oxygen sensor and catalyst. Obviously catalyst will never set, but my concern is reversing the SES light after it was activated for my post cat sensor from rich to lean. I had a tiny leak that I repaired and I also replaced the rear sensor because it was previously bad. The upstream is only a year old. The code that came up was 273A for my rear bank 1 sensor. After replacing it, nothing has gone wrong, but I'm trying to figure out how long it will take for the vehicle to realize that it's okay now rather than resetting it and doing this all over again. If I have no other choice then I will, but I figured I'd try to get some insight.

BPMSport · 04-21-2017, 11:33 AM

Quote:

Originally Posted by bmwlover0725

I recently got my catless tune. All of my monitors set yesterday except oxygen sensor and catalyst. Obviously catalyst will never set, but my concern is reversing the SES light after it was activated for my post cat sensor from rich to lean. I had a tiny leak that I repaired and I also replaced the rear sensor because it was previously bad. The upstream is only a year old. The code that came up was 273A for my rear bank 1 sensor. After replacing it, nothing has gone wrong, but I'm trying to figure out how long it will take for the vehicle to realize that it's okay now rather than resetting it and doing this all over again. If I have no other choice then I will, but I figured I'd try to get some insight.

Reset it. It can take up to 40 cycles.

bmwlover0725 · 04-21-2017, 12:00 PM

Quote:

Originally Posted by Mike Benvo

Reset it. It can take up to 40 cycles.

That's all I needed to hear. Thank you! Although now I'm getting 277C for trim control diagnosis on bank 1... two different sides with issues. I can't wait for this to be over. Any thoughts?

bmwlover0725 · 04-21-2017, 12:24 PM

And if it helps, I was reading data while I was doing the drive cycle and the one I replaced last night is switching perfectly up and down and the other side does next to nothing. It mainly sits at .1 or around there and only switches once in a while. Seems like a very lean condition. Would a tiny leak really cause it to be that far off (if there is one) or is it more likely that the upstream/downstream sensors (or one of them) could be causing it on that side? The other side seems just fine now so hopefully this will be the last of my issues.

04-21-2017, 09:03 AM	#1
bmwlover0725 Second Lieutenant 132 Rep 265 Posts Drives: 2008 M3 Coupe Join Date: Jun 2015 Location: Syracuse, NY iTrader: (1)	Turning off SES from 273A code I recently got my catless tune. All of my monitors set yesterday except oxygen sensor and catalyst. Obviously catalyst will never set, but my concern is reversing the SES light after it was activated for my post cat sensor from rich to lean. I had a tiny leak that I repaired and I also replaced the rear sensor because it was previously bad. The upstream is only a year old. The code that came up was 273A for my rear bank 1 sensor. After replacing it, nothing has gone wrong, but I'm trying to figure out how long it will take for the vehicle to realize that it's okay now rather than resetting it and doing this all over again. If I have no other choice then I will, but I figured I'd try to get some insight.
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04-21-2017, 12:24 PM	#4
bmwlover0725 Second Lieutenant 132 Rep 265 Posts Drives: 2008 M3 Coupe Join Date: Jun 2015 Location: Syracuse, NY iTrader: (1)	And if it helps, I was reading data while I was doing the drive cycle and the one I replaced last night is switching perfectly up and down and the other side does next to nothing. It mainly sits at .1 or around there and only switches once in a while. Seems like a very lean condition. Would a tiny leak really cause it to be that far off (if there is one) or is it more likely that the upstream/downstream sensors (or one of them) could be causing it on that side? The other side seems just fine now so hopefully this will be the last of my issues.
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