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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > DP Fix For N54



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      06-04-2019, 01:24 AM   #1
pabohoney1
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DP Fix For N54

I've been looking for one all over the internet and so far have come up empty handed. Both VRSF and n54tuning.com have stopped selling them, apparently for legal reasons. I was also trying to find a simple schematic but no dice. I've found one blurry picture of the bare circuit board and it looks to be an RC low pass with potentiometer, but I'd like to be sure. So I'm asking for some help here. Can someone take a picture of their N54 dp fix with the black sheathing removed? Front and back please. Or if someone has already figured it out, a simple schematic. Thanks!
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      06-04-2019, 10:14 AM   #2
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Here ya go:

h*t*t*p://www.b*i*m*m*e*r*b*o*o*s*t.com/showthread.php?53622-Make-your-own-oxygen-sensor-tuner

(remove the asterisks)

Last edited by dpaul; 06-04-2019 at 10:46 AM..
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      02-04-2024, 07:54 AM   #3
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had this saved from the original thread on the old, now shut down forum. I've made several of these and a 650 ohm setting measured on the variable resistor worked well for my N54. I'll need it again in April as my car is due for inspection. I believe I have pics of the device from the thread and the one I made. I'll dig around and post when I can.
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File Type: pdf O2 Tuner Schematic.pdf (130.0 KB, 31 views)

Last edited by dmckmc; 02-05-2024 at 08:01 AM..
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      02-04-2024, 07:58 AM   #4
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here is a pic of the device with description from the original thread.
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File Type: pdf O2 sensor build pic.pdf (127.8 KB, 29 views)

Last edited by dmckmc; 02-05-2024 at 08:02 AM..
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      02-05-2024, 08:07 AM   #5
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Here is the device I made and used successfully.
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      02-26-2024, 08:45 AM   #6
330i.germany
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Quote:
Originally Posted by dmckmc View Post
Here is the device I made and used successfully.
Thanks for uploading these! Where do you have the Pins from?
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      02-27-2024, 02:10 PM   #7
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Why not get an MHD and just use the "fix" that comes with it? You'll need it to tune the DPs anyways, right?
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      02-27-2024, 07:29 PM   #8
dmckmc
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Quote:
Originally Posted by 330i.germany View Post
Thanks for uploading these! Where do you have the Pins from?
I'll try to find my receipts, I forget the name of the company.

Quote:
Why not get an MHD and just use the "fix" that comes with it? You'll need it to tune the DPs anyways, right?
DP fix is to pass emissions by allowing all O2 monitors to be properly set to ready. MHD just keeps CEL off, doesn't set monitors to ready.
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      02-28-2024, 02:33 PM   #9
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Quote:
Originally Posted by 330i.germany View Post
Thanks for uploading these! Where do you have the Pins from?

https://www.mouser.com/ProductDetail...esrbVktg%3D%3D
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      03-02-2024, 02:13 PM   #10
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Thank you so much, parts are coming next week. Really excited to see if it works
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