Want to remove/disable your rear O2 sensor without a CEL? Here's how..

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May 20, 2008 | 10:38 PM

#301

$al\lupo's Avatar$

al\lupo

Evolving Member

Joined: May 2007

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From: Italy

Quote:

Originally Posted by taavisev

Is it possible that for rom 88840017 is the right value 89DF to 81DF anybody ho can check the code please look at that is this the right value!

thanx

Yes, it works for me

May 21, 2008 | 08:23 AM

#302

taavisev

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Joined: Apr 2004

Posts: 60

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From: Estonia

it works for me also

but i want to be sure of my findings

thanx anyway

May 24, 2008 | 12:48 PM

#303

justastockevo

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is there any workaround available for 88840016 p0125 errors? i have periphery0 set to 0x56D8, it keeps throwing p0125... any chance to get rid of this with another periphery bit or something?

Jun 13, 2008 | 01:02 PM

#304

rivalaC

Newbie

Joined: Mar 2006

Posts: 40

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From: maryland?

Quote:

Originally Posted by mrfred

Change the table data to ("0x" must precede all entries, e.g., 0x0009, 0xD002, etc):

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

i wanted to share something and this could make life easier. and it works great, just tested it

but, i changed the variables already on a test rom. saved it elsewhere and opened the original rom, and you can copy/paste the changes from one to the other. so, i'm really doing this as a service to ppl that have yet to change the variables as shown above.

so here's the deal, open your rom, find either of these, open it, copy the relevant text below, go to edit > select all > paste. double check versus above data and so forth.

copy bold..

rear o2 sim hook

9
9
9
53250
16395
9
40962
9
4
40960

rear o2 sim subroutine

55814
27297
27309
18953
56069
27569
27581
19209
19201
15036
56067
11169
11
9
65535
27236
65535
27446
65535
27240

Last edited by rivalaC; Jun 13, 2008 at 02:26 PM.

Jun 13, 2008 | 02:33 PM

#305

23r0k001

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From: Raliegh, North Carolina

if this is the change for the evo9 usdm rom, then yes its confirmed. I have gotten a NYS inspection 3 weeks ago. I have a test pipe and the rO2 sensor plugged into the catback exhaust bong. The bong is angled at bout 30 degreez

Jun 14, 2008 | 12:37 AM

#306

JohnBradley

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From: Northwest

Quote:

Originally Posted by justastockevo

is there any workaround available for 88840016 p0125 errors? i have periphery0 set to 0x56D8, it keeps throwing p0125... any chance to get rid of this with another periphery bit or something?

56D8 is just the rear O2, P0125 is a coolant temp error. Whether or not there is a periphery that specifically cures that I am not able to say. My latest charting of the peripheries hasnt yeilded one yet.

Jun 26, 2008 | 07:16 AM

#307

scheides

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From: Minneapolis

Quote:

Originally Posted by mrfred

I've been trying to get at this heater check routine from a few different angles. Today, I think I found the periphery bit that controls the O2 heater check. It appears to be periphery2, bit 11. Not sure what effect it will have on the OBD-II test readiness state. Here's what to do:

Change Periphery2 from EFDF to E7DF

If I am interpretting the ROM code correctly, there is no way to disable just the rear O2 heater. This will disable both the front and rear O2 heater checks, so beware of that limitation. If someone could try this and report back to me, I would appreciate it. Also, could you use ScanTech to observe the "Readiness" condition for the heater check?

Bump! mrfred, any idea what value to use for some other roms...namely 96530006

Jun 27, 2008 | 08:33 AM

#308

scheides

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From: Minneapolis

Is there any reason a 10k ohm, 1/2 watt resister wouldn't work or be bad for the circuitry? I went to radioshack and they did not have 1/4 watt ones, so I decided to try the 1/2. The math of the situation seems like it would upset things, but I don't seem to have a CEL. I just don't want to wreck the wiring, a relay, or something else.

Jun 27, 2008 | 09:32 AM

#309

Jack_of_Trades

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From: Opelika,AL

Quote:

Originally Posted by scheides

The ECU "should" see such a high resistance as a faulty heater circuit, which is why everyone uses two 50 ohm- 10 watt resistors in parallel so the ECU see's a 25 ohm load. This is still almost twice the resistance as the standard heater circuit. Be warned..these suckers get HOT! Like, melt through a plastic box type of hot. Its best to enclose them inside a metal project box (sold at radishack usually) and suspend the resistor in the middle of the box so they don't touch the sides.

Hopefully the entire heater circuit function can be disabled in the rom soon while eliminating the CEL issue.

Jun 27, 2008 | 11:51 AM

#310

scheides

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From: Minneapolis

The original post here says to use a single "10kohm/.25 amp" resister, where is this two 50 ohm- 10 watt resistors in parallel coming from? I'll use it if it works, cause 10k/.5 watt does not work.

Jun 27, 2008 | 12:10 PM

#311

Zeitronix

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10K is too high. ECU needs to see some load on the heater circuit.
See post # 80
https://www.evolutionm.net/forums/sh...1&postcount=80

Jun 27, 2008 | 12:43 PM

#312

scheides

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From: Minneapolis

WTF so does post #1 even work? It should be edited.....

Jun 27, 2008 | 01:39 PM

#313

mrfred

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From: Tri-Cities, WA // Portland, OR

Post #1 is still correct, but there are several options now.

Jun 27, 2008 | 04:01 PM

#314

EvoBroMA

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Joined: Feb 2006

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From: MA

Quote:

Originally Posted by scheides

The original post here says to use a single "10kohm/.25 amp" resister, where is this two 50 ohm- 10 watt resistors in parallel coming from? I'll use it if it works, cause 10k/.5 watt does not work.

Quote:

Originally Posted by dexmix

I'm using the 50Ohm 10W, and its been working for several weeks.

even @ 15V it would still only suck down 4.5W so im happy enough with the 10W rating.

*bump* for full ecu fix. not too fond of running around with a non weather proofed resistor on my under carriage

TIA mrfred!!!!

still working for me

Jun 27, 2008 | 07:37 PM

#315

scheides

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From: Minneapolis

Hrm, 10k ohm/1/2 watt just doesn't work for me. I got 2 of the big 10ohm 10watt suckers tonight, gonna be trying them soon

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