Complete Rear O2 Delete Patch (88590015)
This guide will show you how to "delete" your Rear O2 Sensor without any hardware mods. I did not create these patches; I am simply putting them all in one place to make it easier for people who want to do this.
What does this patch do? This patch combines the "O2 heater patch" with the "Rear O2 Sim" patch which effectively deletes the rear O2 sim from your car, without throwing any CEL lights. Full credit for these patches goes to mrfred. These patches are for ROM ID: 88590015 Step 1 Copy and paste the following table definitions into the appropriate XML definition file for ECU Flash. The default file location is: C:\Program Files\OpenECU\EcuFlash\rommetadata\mitsubishi\evo\ 88590015.xml Code:
<table name="Rear O2 Heater Patch" category="Rear O2 Sensor" address="2db04" type="1D" scaling="Hex16" /> Once you add the patch, open your rom in ECU flash and verify that the data matches the listing below BEFORE you make any changes: Rear O2 Sim Hook E408 D525 6613 D002 400B 0009 A002 0009 0000 D6A2 Rear O2 Sim Subroutine FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF Rear O2 Heater Patch 4A0B If everything matches up, you then need to make the following changes. Just go line-by-line: NOTE: All values are HEX, you must type 0x before each when entering them in ECU Flash. Example: 0x0009 Rear O2 Sim Hook 0009 0009 0009 D002 400B 0009 A002 0009 0004 A000 Rear O2 Sim Subroutine DA06 6AA1 6AAD 4A09 DB05 6BB1 6BBD 4B09 4B01 3ABC DB03 2BA1 000B 0009 FFFF 6A64 FFFF 6B36 FFFF 6A68 Rear O2 Heater Patch 0009 Step 3 You are finished. Save the file and flash it to your car. If you did everything correctly you will no longer get a CEL light while running a test pipe or high-flow cat. You can also remove the Rear O2 sensor completely if you want to without any worries. You do not need to make any hardware modifications. If your car has 885900xx and you would like to change to 88590015 My car had the 88590013 ROM which I changed to 88590015. If your car is stock and has no tuning, then you can simply download the 88590015 ROM image from the link below and flash it after adding the O2 patches. If you have any custom tuning, you would need to copy them from the existing ROM into the newer one. In all cases the immobilizer code will also need to be copied from the existing ROM to the new one or your car will not start! Download Stock Evo IX ROM BINs |
I understand this "deletes" the code, but does it disable the readyness monitor as well? In the Dodge software, you can delete the rear o2 as well, but if you go to emissions it fails due to a "not ready" status. Just wondering if you've actually tried going to pass?
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Originally Posted by Straightline
(Post 9517389)
I understand this "deletes" the code, but does it disable the readyness monitor as well? In the Dodge software, you can delete the rear o2 as well, but if you go to emissions it fails due to a "not ready" status. Just wondering if you've actually tried going to pass?
There is another patch out there that you can apply which sets all your OBD-II tests to "pass". I added this patch to my rom, but I did not bother to set them all to pass yet. https://www.evolutionm.net/forums/ec...us-mrfred.html If I have a problem with the inspection I'll just set it so the O2 sensor "passes" and that's that. |
ive passed obd2 scan inspection with both those patches set up, no problem.
be careful setting all circuits to pass, you really need to set it to the factory settings since the car doesnt actually have obd2 monitoring of all the available choices. |
new to the EVO forum and the EVO world all together. i bought my EVO from the orginal owner who never bothered to do this. can someone else me get started ?
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Update 10/29/2011:
Passed inspection with no problems using this hack. Working great. After setting this up my car stopped throwing those annoying 0420 OBD codes.
Originally Posted by gomcar25
(Post 9707639)
new to the EVO forum and the EVO world all together. i bought my EVO from the orginal owner who never bothered to do this. can someone else me get started ?
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Could I use a serial cable ?
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No, if you want to use ECUFlash you'll need to get the cable they sell. It's only $60 or so and it's worth it if you plan to do any ecu tuning.
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K
Originally Posted by SsZERO
(Post 9708500)
No, if you want to use ECUFlash you'll need to get the cable they sell. It's only $60 or so and it's worth it if you plan to do any ecu tuning.
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New here...I just found that I have ROM ID: 94170008; the most common ID seems to be 88590015. Is there a way to change my ROM ID to another? I'd really like to use this O2 patch. I just bought the car and from what I'm told it has been tuned. Looks that way from the fuel maps too...any help would be great.
thanks '03 VIII |
Originally Posted by nickferguson08
(Post 9761851)
New here...I just found that I have ROM ID: 94170008; the most common ID seems to be 88590015. Is there a way to change my ROM ID to another? I'd really like to use this O2 patch. I just bought the car and from what I'm told it has been tuned. Looks that way from the fuel maps too...any help would be great.
thanks '03 VIII I do believe there is a similar process for O2 sensor deletion that can be done with 9-series rom images, but you'll have to search these forums to find it. |
you are in philly?? i dont think ive never met u before :lol:
i found this for my 96530706 Im a little confused as to which procedure i need to go with.... First of all, are you running Tephra?
Originally Posted by scheides
(Post 7712839)
So you run 96530706 and literally just did:
Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2c62a" type="1D" scaling="Hex16" /> **edit** I tried it, it seems to work great! I have the rear o2 completely unplugged. I'll make sure nothing silly becomes of it over the next week but all seems fine for now.
Originally Posted by donner
(Post 9532532)
All you need to do is:
1) Activate Rear O2 simulator from Tephra options 2) Add following patch to your 96530006.xml to disable rear O2 heater cell (set Rear O2 Heater Cell Enable to value 0 to disable cel): Code:
<table name="Heater CEL" category="Rear O2" address="2c625" type="2D" level="2" scaling="blobbits"> I hear this is all i need to do in a different thread. which procedure do i follow? this or yours? |
Originally Posted by bnr34rb26dett
(Post 9763310)
you are in philly?? i dont think ive never met u before :lol:
i found this for my 96530706 Im a little confused as to which procedure i need to go with.... First of all, are you running Tephra? I hear this is all i need to do in a different thread. which procedure do i follow? this or yours? |
ok great thanks for the clarification!
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I want to thank you for writing this, although I don't think I will need to use it.
My gratitude comes from someone taking the time and making specific threads for solutions which so many need instead of reading 100+ page threads and trying to find all the information that you need. I honestly believe majority of these threads need to be rewritten and broken down based on ROM's and such, although that takes a lot of time, I'd be willing to do it if I understood everything 100%... but I don't unfortunately |
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