issue with cel past 7k rpm and meistershaft muffler - BMW M5 Forum and M6 Forums

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Old 31st December 2012, 01:49   #1
bimma328
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issue with cel past 7k rpm and meistershaft muffler

like the title says, im getting 2 codes post catalytic converter issue when i go over 7k rpm, it doesnt do it if i put my oem mufflers, wierd? alot of people here have muffler delete and aftermarket exhaust, any ideas on how to fix this?
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Old 31st December 2012, 02:00   #2
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Your cats are starting to fail.
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Old 31st December 2012, 02:03   #3
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both? why it doesnt do it with oem mufflerS??? its driving me insane!
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Old 31st December 2012, 03:24   #4
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both? why it doesnt do it with oem mufflerS??? its driving me insane!

i will take a wild guess...i think oem mufflers are more restrictive and the meisterschaft is more free flowing. so the exhaust gas flows faster and does get cleaned enough

but i was told by a bmw tech friend that as soon as one side of the cat defficiency code is thrown the other side goes off with it.
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Old 31st December 2012, 03:34   #5
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i will take a wild guess...i think oem mufflers are more restrictive and the meisterschaft is more free flowing. so the exhaust gas flows faster and does get cleaned enough

but i was told by a bmw tech friend that as soon as one side of the cat defficiency code is thrown the other side goes off with it.
i was thinking the same, what do you think about this:

Angled O2 Simulator, Angled O2 Simulator clears p0420 / p0430 check engine light
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Old 31st December 2012, 17:19   #6
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Don't think it will work on our cars. I tried a number of such items including the electronic simulator that varied the voltage within the correct window and that also did not work. The DME is a little too smart for all that I tried. i even tried the spacer with a little mini cat built into it and that failed like all the rest.
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Old 31st December 2012, 17:41   #7
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Damnnnnn that sucks. So what's the solution. People running catless straight pipe what are they doing with the o2 sensor? Any way to code the car to bypass these?
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Old 31st December 2012, 17:48   #8
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You can get software that will turn off the CEL light, no problem at all. I happen to be a fan of the ESS brand, but I am sure that many others can do that. In the end it comes down to what do you have to do to pass inspection. As it works out for me it is not an issue if one of the readyness codes is not set and all the others are ok, at least that is the case in NC. With that I pass inspection no problem. If you go that route, you might as well get rid of the CATs and go full headers (the path i took).
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Old 31st December 2012, 18:03   #9
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Any idea on how to program the software to turn off cel ? I have a laptop and all the cables and bmw software. If I can do it I will by myself if not my mechanic has the DIS progman tools. Thanks
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Old 1st January 2013, 00:45   #10
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that i don't know. But if you figure that out, please let me know.
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