Disable O2 sensor MS41.0

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

Hello guys, do you know how to disable the O2 sensors in MS41.0 without having a DTC?
If the DME has a lambda DTC (unplugged), does it read another map than the main fuel map ?
Thanks for your help.

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

Nobody can help me with that ?
I saw that it´s possible to disable them in MS41.1, the solution would to flash my MS41.0 with MS41.1 ?

Johnny_B · **Joined:** Thu May 28, 2015 1:27 pm **Posts:** 87

is the engine stock ?

Johnny_B · **Joined:** Thu May 28, 2015 1:27 pm **Posts:** 87

if yes, you should flash your ms41 with winkfp. unplug O2 sensors before programming...

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

BMW_3xx_i wrote:

if yes, you should flash your ms41 with winkfp. unplug O2 sensors before programming...

No, it's not stock.
2.8 engine with M50 intake, M3 exhaust, 36lb injectors and running on E85.

Yes, I've already made my tune with the O2 sensors unplugged but I had a DTC obviously and my question is does it matter or not ?
I would like to disable O2 feedback (no DTC, not just unplug them) because I don't know if it changes something with the DTC in it when tuning.

Johnny_B · **Joined:** Thu May 28, 2015 1:27 pm **Posts:** 87

did you clear adaptations after unpluging 02 sensors ?

busterhax · **Joined:** Wed Jan 22, 2014 6:54 pm **Posts:** 1773

Either post your file or post a stock version of your file and so that it can be determined which byte disables your PRIMARY o2 sensor(s).

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

BMW_3xx_i wrote:

did you clear adaptations after unpluging 02 sensors ?

Yes, after flashing I clear adaptations with INPA.

busterhax wrote:

Either post your file or post a stock version of your file and so that it can be determined which byte disables your PRIMARY o2 sensor(s).

Okay, this is the stock file from my M52b28.
Thank you.

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

With the file posted, does anyone know or i have to flash MS41.1 ?

Johnny_B · **Joined:** Thu May 28, 2015 1:27 pm **Posts:** 87

pm, I'll help you remotely

busterhax · **Joined:** Wed Jan 22, 2014 6:54 pm **Posts:** 1773

M52Drifter wrote:

BMW_3xx_i wrote:

did you clear adaptations after unpluging 02 sensors ?

Yes, after flashing I clear adaptations with INPA.

busterhax wrote:

Either post your file or post a stock version of your file and so that it can be determined which byte disables your PRIMARY o2 sensor(s).

Okay, this is the stock file from my M52b28.
Thank you.

Try 0x260 change to 00h.

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

Thank you, I'll try it and will report you if it works.

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

Hey guys, I will try soon as possible to disable the byte that Busterhax told me but I still have another question.
On my bin, the Byte 6 has been disabled, it has "FF" instead of "1C" (stock), I guess it was for the secondary O2 sensors (US cars), am I right ?
Do you guys know the bits (bit 1,2,3,4.....=0 =1 ???) in Byte 6 ?
Thanks

mrf582 · **Posted:** Thu Apr 21, 2016 4:24 pm

M52Drifter wrote:

Hey guys, I will try soon as possible to disable the byte that Busterhax told me but I still have another question.
On my bin, the Byte 6 has been disabled, it has "FF" instead of "1C" (stock), I guess it was for the secondary O2 sensors (US cars), am I right ?
Do you guys know the bits (bit 1,2,3,4.....=0 =1 ???) in Byte 6 ?
Thanks

You need to start with a STOCK file and ONLY use RR to make changes. At no point did my XML definitions every populate that byte with FF. Who knows what else is screwed up. See the other thread just I just locked due to data corruption of the hex because they didn't use RomRaider.

M52Drifter · **Joined:** Sun Sep 06, 2015 2:16 pm **Posts:** 144

I didn't changed this in my tune, it was in a chiped DME that I bought and I'm trying to understand all the controls bits in this area.
Byte 6 and 7 has been disabled, FF's, and I'd like to know why, do you guys know something about this ?

Edit : Yep, about the other thread you locked, i agree, but I always use RR to define my maps, and I use wols to see how a bin file is made, look for adress and stuff...

RomRaider

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Disable O2 sensor MS41.0

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