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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 08-31-2012, 10:22 AM   #1
wamcdonald
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DIY: Reset long term fuel trims

I stumbled across a method for resetting long term fuel trims:

With car running disconnect the MAF sensor wait a few seconds and reconnect it, that's it. The car may stall but just re-start and you may through a MAF code but this gets the values back to zero.

Last edited by wamcdonald; 08-31-2012 at 10:25 AM.
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Old 08-31-2012, 10:36 AM   #2
smooth1
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Or get a $9 cable and use this software to reset adaptations for free. That way everything is reset properly, not just the long term trims. http://bimmersoftware.com/BMWLogger
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Old 08-31-2012, 12:52 PM   #3
Drewfus2101
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Or get a $9 cable and use this software to reset adaptations for free. That way everything is reset properly, not just the long term trims. http://bimmersoftware.com/BMWLogger
This program will cost you $49.

I like INPA (free program) for all sorts of good things. It'll clear a whole bunch of adaptations as well as read CELs and give an actual read out of a bunch of sensors.

You'll still need a cable and you'll have to modify it, but it isn't that tough to do, and some people will sell you a modified cable.
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Old 08-31-2012, 12:59 PM   #4
smooth1
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No, it doesn't cost you $49 to do what I mentioned. It's actually free to check / clear codes and clear adaptations. Please get your facts right. These are listed as FREE right on the page I linked to.
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Old 08-31-2012, 01:15 PM   #5
TomTomTuning
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Just curious, I have the BMW Scanner 1.4.0 from xcar360... Can I use that adapter for INPA or BMW Logger?
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Old 08-31-2012, 01:25 PM   #6
smooth1
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Unfortunately everything I've heard points to no. It was a proprietary interface. :/ Luckily the VAG-KKL cables are very cheap nowadays. The one linked to on my page I've purchased many times for dyno tuning etc and I've never needed to modify them for my customers.
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Old 08-31-2012, 02:14 PM   #7
BWOODM3
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Good thread
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Old 08-31-2012, 02:15 PM   #8
Bob Ramberg
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What is the reason behind wanting to reset long term fuel trims? I am unfamiliar with this parameter, what does it do?
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Old 08-31-2012, 02:32 PM   #9
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Originally Posted by TomTomTuning View Post
Just curious, I have the BMW Scanner 1.4.0 from xcar360... Can I use that adapter for INPA or BMW Logger?
no
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Old 08-31-2012, 10:20 PM   #10
wamcdonald
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Originally Posted by Bob Ramberg View Post
What is the reason behind wanting to reset long term fuel trims? I am unfamiliar with this parameter, what does it do?
I have been chasing, to no avail the ever so fun P0171 and P0174 lean codes. I wanted a way to reset the fuel trims but only have a basic OBD2 scanner. I am using this HACK so that I can test the next part I replace on the car.

Last edited by wamcdonald; 08-31-2012 at 10:25 PM.
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Old 09-03-2012, 04:58 AM   #11
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Great work!
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Old 11-05-2013, 11:26 AM   #12
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What's this $9 cable? Could someone post the link or name
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