EVOkeeper

iTrader: (1)

I would like to thank mrfred for making this mod possible and for SsZERO because it just happens to be his thread that i find with this awesome piece of info.

this was my first reflash too, and SsZERO layed it down for me to understand w/o a problem!!! thanks again.

Evo MR IX Fritz

iTrader: (2)

I have added this patch to my 88590015 ROM after removing the rear o2 pin from the ecu. I am now throwing cell code p0138. I've tried every o2 removal patch to no avail.thanks In advance

Fritz

studioface

iTrader: (10)

This worked great thanks alot!!!

Grimgrak

iTrader: (3)

The only reason i'd remove my rear 02 is to log the wideband instead... Not sure why else you'd want to do this.

EVOkeeper

iTrader: (1)

If you are like me and like the vast majority that is running straight turbo back exhaust with test pipes and you dont want that annoying service engine soon in your face.

mitsubeastlee

iTrader: (3)

if the car was tuned with the rear o2 in place ( 3 inch hi flow cat) and now ive deleted my cat and plan to run a test pipe with the o2 in place tapped into the test pipe. will i throw a code and also how will the car run/ should i just run this patch and disable? wont my car run in closed loop the whole time without it?

yellowbirds58

iTrader: (3)

question on this. for the folks that did this mod, how many miles did you drive after for the o2 to catch up and get corrected?
i've done the patch but seems like my O and OH is still not ready. i've driven about ~30 miles

trEVOlution

Have recently had my 2003 JDM evo 8 tuned for E85 with dual maps using the 96530706 xml.
The original Jdm XML was 93660005.

I've read every page in about 8 different threads about this but have not been able to get this resolved yet. Obviously being Jdm my car never had a rear 02 sensor, so it is software related as the code only came up after the reflash.

How should this be resolved.?
It has been disabled using the 00009 (or something, not i'm not the tuner but he's used that before and its worked) patch, with rear 02 sensor heater turned off in periphery and not, also tried the rear 02 sensor simulator, in which just made the car rev weirdly at idle and threw AFR's way out. Without being skilled in this myself i can say with confidence my tuner is and had flashed many 8s without problems.

I have been back to the tuner several times and we have tried all options i could see mentioned in the threads to work this out and it just comes back on after 20-30mins. I have read that the 96530706 is difficult to work out on cars older than 2005. Is this the problem and do we need to try a different xml? If so which is recommended and how to disable the rear 02 sensor in that?

Understand this may have been answered but would really appreciate it spelled out in a single paragraph so i can take instructions back to tuner. Thanks

6spdlegend

iTrader: (2)

"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"

what exactly does this mean?

SsZERO

It means exactly what it says: compare the values that are listed right below in that step to the values that you see in ecuflash when you open the rom and verify that the values of your rom image match.

6spdlegend

iTrader: (2)

got it- patch applied

SsZERO

Sorry I haven't been getting updates on this thread so there are some old questions that I didn't reply to:

The rear O2 is basically there to verify that the catalytic converter is functioning properly and nothing more. It's not like the front O2 sensor that the engine uses to adjust performance parameters. When you swap to a high flow cat or test pipe, you'll eventually get a CEL. This patch eliminates that nuisance CEL for those of us that are running a HFC or test pipe.

The rear O2 is a diagnostic sensor that doesn't/shouldn't have any effect on engine performance. I.e., the car will not switch to a "safe mode" ECU map if there's a problem indicated by the rear O2, nor should your tune be affected.

My car was tuned with the rear O2 in place and I applied this patch afterwards; never had a problem and car still runs fine. It has been 4 years since I patched my car.

It should be instant because the patch effectively removes the rear O2 from the equation. The patch won't reset an existing CEL related to the O2 sensor; to do that you'd need an OBD scanner which you plug in and use to delete the error code causing the CEL (as long as it's the code for the O2 sensor. If it's a different code you should check it before resetting it). You'll know the patch is working because you will never get a CEL for the rear O2 sensor in the future.

6spdlegend

iTrader: (2)

For those who wire their wideband into the ecu by tapping into the rear o2 wire- will this patch interfere with that? The reason I ask is because I'm following this guide to get my wideband up and running for datalogging using rear o2 wire into ecu:

https://www.evolutionm.net/forums/la...o-evoscan.html

and I'm not able to get valid values from the wideband in EvoScan- I'm wondering if this rear o2 delete patch could be the reason?

curamrdan

88590015, using Heather patch to fix 0037 cel , but still have 0136, so add rear O2 sim, seem to fix that. BUT then car doesnt follow fuelling from fuel table. Runs much leaner, follow 12.x AFR instead 10 or 9 which are actually in fuel table. So i removed O2 sim, fuelling ok, just 0136 in ecu memory(no CEL light fortunately).

Probably nobody have this problem, im right?

qsiguy

So apparently due to the bug announced at the top of the page, the patch from the OP did not appear as plain text and it had me confused for a bit. I've put it in a .txt file and attached here if anyone else needs the patch and cannot figure out how to see it.