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  1. #1
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    Make your own oxygen sensor tuner

    Greetings from China,

    I have made this oxygen sensor tuner for my dedicated track race car to adjust the rear o2 sensor air/fuel ratios and keep the ECU happy with downpipes and I want to share with you its design and construction. This part is for racing cars that ride on a car carrier to the track.

    The ECU contacts are difficult to locate but I was able to get sample contacts from a TYCO dealer directly. It is likely BMW has these same parts under different numbers.

    Once construction is complete the tuning module installs to the rear oxygen sensor wires within the DME box. To access these remove the smaller DME connector and slide out the black
    subconnector.

    Extract the wire from ECU position #19 which has a yellow wire and insert the male pin from
    the tuner in to this original female wire. Use a piece of tape to ensure the wires do not disconnect.

    Extract the wire from ECU position #20 also yellow wire and cover it with a piece of tape. It is not used with tuner in place.

    Insert female pins from tuner into ECU positions #19 and #20 . These are the modified
    signals going back to the ECU.

    Adjust the trim pot to 50% (500 OHMS) for the starting point. The higher the OHMS the more altered the signal to the ECU. The lower the OHMS the less altered the signal to the ECU.

    Clear all ECU codes and evaluate which codes return. Codes 29F4 and 29F5 indicate a higher trim pot OHMS is required while any other oxygen sensor related codes indicate a weaker signal is required.

    Enjoy!
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  2. #2
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    Care to publish a simple pdf? And add what o2 sensor cables you use?

    I am looking for doing this on a 911 so I am hoping for a generic schema.
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

  3. #3
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    Btw the return signal to 19 & 20 its for both banks right?
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

  4. #4
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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    Btw the return signal to 19 & 20 its for both banks right?
    With this construction the signals for the oxygen sensors are combined for simplicity. It would be possible to use two of these devices with dual trim pots to retain separate signals and likely a more reliable end result.

    I am hopeful this thread will become popular for do it yourself people like me to share their constructions, images of installation, and other helpful tips for future generations of N54 race car fans to use as a reference.

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    I'm assuming this is just like the BMS downpipe fix? Very nice!

  6. #6
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    I like this guy.

  7. #7
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    Click here to enlarge Originally Posted by V8Bait Click here to enlarge
    I like this guy.
    We all do Click here to enlarge
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

  8. #8
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    Isn't this the DP fix many of you have been looking for?

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    Absolutely! Awesome guy!!

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    1 out of 1 members liked this post. Reputation: Yes | No
    Just curious, has anyone created one of these themselves yet? If so, were you able to successfully mimic a "readiness" status within the DME without cats on the vehicle?

  11. #11
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    3 out of 6 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by 410bn Click here to enlarge
    Just curious, has anyone created one of these themselves yet? If so, were you able to successfully mimic a "readiness" status within the DME without cats on the vehicle?
    WedgePerformance X-Kitty

    Click here to enlarge

  12. #12
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    Edited out

  13. #13
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    Click here to enlarge Originally Posted by Wedge1967 Click here to enlarge
    Edited out
    You're walking a fine line. I understand the desire to help but when you sneak it in with watermarks and this is a part you sell for profit I can't allow it as vendors pay hard earned money to advertise parts.

    I'm being cool with you but this is the last time I mention this. Your account gets limited next time.

  14. #14
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    1 out of 1 members liked this post. Reputation: Yes | No
    so you obviously didn't do the ground wire, but two males and two females, how do you hook this up and whats the scheme for actual fix, I'd like to make my own. also what would the OHMage be for m3 S65

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    how would you plug this into my M3 e90 ECU... does it have to have a ground wire? can it just simply be both banks in and two banks out back to the ECU?

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    Click here to enlarge Originally Posted by cbozz Click here to enlarge
    how would you plug this into my M3 e90 ECU... does it have to have a ground wire? can it just simply be both banks in and two banks out back to the ECU?
    That’s exactly how he did it. One input, 2 output and chassis ground. You can also use the sensor ground for cleaner install.

    You don't need to connect both o2's, one input is fine for this method.

    Find your ecu pin out and re pin as above mentioned. Might not be pins 19 and 20, but you get the idea... i hope.
    Last edited by crewdawg130; 12-29-2014 at 03:19 PM.

  17. #17
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    The N54 DP fix using a 1k ohm trim pot and S65 uses a 2.2k ohm trim pot. I don't have any of the S65 DP Fixes available at this time, but could special make one if you need one. You can email me at WedgePerformance@gmail.com

  18. #18
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    2 out of 2 members liked this post. Reputation: Yes | No
    I made and installed this over 2 week ago on my N54. 3 days after, got the CEL and adjusted I bit. No CEL and readiness ok after that. It had been over a week now. The only difference on mine is that I used one of the rear o2 sensor ground instead of chassis ground.

  19. #19
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    Is there any benefit to running this instead of tuning it out? I was under the impression that you could just set cat conversion bank 2 to 00 instead in TunerPro?

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