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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 04-18-2013, 12:47 PM   #1
trentcdrums
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Will this work on our cars?

Someone should know. I know its an M3 but its possible it could work. http://www.m3forum.net/m3forum/showthread.php?t=337969
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Old 04-18-2013, 10:47 PM   #2
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Old 04-19-2013, 12:13 AM   #3
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Interested to know too
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Old 04-19-2013, 08:03 AM   #4
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Someone's got to know! This saves room, time and stress.
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Old 04-19-2013, 07:52 PM   #5
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I'm going through sim problems right now.
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Old 04-19-2013, 11:29 PM   #6
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It alleviates the problem of the of the CEL from the post cat 02 sensors, and will work for that. BUT you will still get a check engine light, for the heater circuit of those post cat 02 sensors.

The only real solution is to get a tune (AA or ESS) and make sure they turn off the monitoring for the heater circuits as well.

The even more effective and cheaper solution, is to have your cars DME reflashed to the EU2 tune. This turns the post cat 02 sensors, their heater circuits, and the SAP to N/A so that the car doesn't even try to monitor them. A bonus is that you will still pass inspection in some states, as the car will then appear as though it is an imported european car, where those emissions standards don't apply.
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Old 04-19-2013, 11:50 PM   #7
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What about defoulers?
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Old 04-20-2013, 12:23 AM   #8
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Will this work on our cars?

Gentlemen, I just remived mines due to a new tune. I had defoulers and this same exact O2 sim with NO issues and No SES light at all! It wirked flawlessly!! I am F/I and have the 200 cell cats on there. Good luck!


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Old 04-20-2013, 12:30 AM   #9
trentcdrums
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Originally Posted by BMtroubleYou View Post
Gentlemen, I just remived mines due to a new tune. I had defoulers and this same exact O2 sim with NO issues and No SES light at all! It wirked flawlessly!! I am F/I and have the 200 cell cats on there. Good luck!


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Would you sell? And do you need both defoulers and o2 sim? Or does it matter? Thanks!
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Old 04-20-2013, 02:55 AM   #10
lejeunebimmer
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You generally use one, or the other, although you can indeed use both. It is completely pointless to use defoulers if you have the sim, as the defoulers are trying to mechanically emulate what the sim is doing via electronics.

My point, there is no need, or added benefit, to using both.

As to your original question to me about the defoulers; I have never used them personally but it seems to be the common consensus that they may or may not work for a little while, but in the end you will get the Service Engine Soon light.

Please do your self a favor and search some before you ask questions that have been beaten to death such as these.

While you are searching please also research that EU 2 tune I was talking about. Most of your local reputable BMW Specialty shops should be able to flash your car to that tune for 150 or less and is guaranteed to solve your problem 100% no ifs ands or buts
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M3 - Not enough room to list
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