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

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Sep 25, 2009 | 05:18 AM

#436

honki24

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From: Houston, TX

I know there's a software fix for the rear heater CEL.... but for those of us who have removed the front O2 sensor, this thing is still needed. Just purchased one of these from ebay (~$8):

Code:

Description:       
	

Mil-Spec, Wirewound Power Resistor.  Aluminum housing is chassis mountable to utilize heat sink effect.  Standard winding (ERH-10 Model).  Molded construction for complete protection from the environment.
Part Number: 	

RER65F75R0R
Quantity: 	1 Piece
Resistance Value: 	75 Ohm
Tolerance: 	± 1%
Maximum Working Voltage: 	265 Volts
Wattage Rating: 	10 Watts  (when mounted,  6 watts in free air)

Packaging:
	Chassis Mount Aluminum Housing

Overall Length:
	1.375 inches (including leads)

Part Marking:
	91637 JAN RER65F75R0R 10W 75 OHM 1%      (Date codes may vary)

Manufacturer:
	Vishay - Dale

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

Sep 25, 2009 | 05:52 AM

#437

Jack_of_Trades

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From: Opelika,AL

Quote:

Originally Posted by honki24

I know there's a software fix for the rear heater CEL.... but for those of us who have removed the front O2 sensor, this thing is still needed. Just purchased one of these from ebay (~$8):

Code:

Description:       
	

Mil-Spec, Wirewound Power Resistor.  Aluminum housing is chassis mountable to utilize heat sink effect.  Standard winding (ERH-10 Model).  Molded construction for complete protection from the environment.
Part Number: 	

RER65F75R0R
Quantity: 	1 Piece
Resistance Value: 	75 Ohm
Tolerance: 	± 1%
Maximum Working Voltage: 	265 Volts
Wattage Rating: 	10 Watts  (when mounted,  6 watts in free air)

Packaging:
	Chassis Mount Aluminum Housing

Overall Length:
	1.375 inches (including leads)

Part Marking:
	91637 JAN RER65F75R0R 10W 75 OHM 1%      (Date codes may vary)

Manufacturer:
	Vishay - Dale

I use this exact same one before for my rear O2 heater circuit and it worked wonderfully, and its so SMALL!

Sep 25, 2009 | 06:37 AM

#438

honki24

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From: Houston, TX

Quote:

Originally Posted by Jack_of_Trades

I use this exact same one before for my rear O2 heater circuit and it worked wonderfully, and its so SMALL!

Cool! Did it get hot? I'll install mine tomorrow. I think I'll tap the firewall and screw it to there to create a heat sink. Anything's got to be better than the super hot O2 sensor I have ziptied to my Ingalls torque damper.

Sep 27, 2009 | 03:03 PM

#439

honki24

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From: Houston, TX

Quote:

Originally Posted by honki24

I know there's a software fix for the rear heater CEL.... but for those of us who have removed the front O2 sensor, this thing is still needed. Just purchased one of these from ebay (~$8):

Code:

Description:       
	

Mil-Spec, Wirewound Power Resistor.  Aluminum housing is chassis mountable to utilize heat sink effect.  Standard winding (ERH-10 Model).  Molded construction for complete protection from the environment.
Part Number: 	

RER65F75R0R
Quantity: 	1 Piece
Resistance Value: 	75 Ohm
Tolerance: 	± 1%
Maximum Working Voltage: 	265 Volts
Wattage Rating: 	10 Watts  (when mounted,  6 watts in free air)

Packaging:
	Chassis Mount Aluminum Housing

Overall Length:
	1.375 inches (including leads)

Part Marking:
	91637 JAN RER65F75R0R 10W 75 OHM 1%      (Date codes may vary)

Manufacturer:
	Vishay - Dale

Installed yesterday, stays plenty cool. Only gets warm. bye-bye CEL.

Oct 4, 2009 | 07:31 PM

#440

McLaren F1 2003

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From: Las Vegas

ok, i did the rear o2 sim code and it stopped my p0420 CEL (the reason im running it) and i think it stopped me from logging my lt low and mid fuel trims. i switched the rom code back and they started logging again

has anyone had this problem?

Oct 5, 2009 | 07:51 PM

#441

McLaren F1 2003

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From: Las Vegas

NEVERMIND, im dumb hahaha

i think i found what i needed

Mar 24, 2010 | 01:53 PM

#442

DanilaGSI

Newbie

Joined: Aug 2009

Posts: 15

Likes: 0

From: Belarus

tephra v5.10 didn`t work for my CEL, but adding this line to my 96420011 xml
<table name="ECU Periphery0" category="Misc" address="faa" type="1D" level="1" scaling="Hex16"/>
and changing "0x56DA" to "0x56D8" seemed to help))) good luck

May 5, 2010 | 10:27 PM

#443

widge

Evolving Member

Joined: Mar 2010

Posts: 478

Likes: 1

From: Australia

If im not unplugging or removing the rear 02 sensor but want to get rid of the code coming up can i just change 0x56DA to 0x56D8 and thats all?

Nov 6, 2010 | 08:49 PM

#444

qnz

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From: nYc

Quote:

Originally Posted by mrfred

I have a software fix for the Rear O2 CEL for the Evo IX 88590015 ROM. The code simulates the rear O2 signal. It should pass any emissions test. It only elminates the rear O2 CEL. If you want to remove the rear O2 sensor from the car, you'll have to do the resistor mod described in the first post. Here are the entries to add to the ECUFlash "88590015.xml" file:

--- start here (do not add this line) ---
<table name="Rear 02 Sim Hook" category="Rear_02" address="c250" type="3D" level="1" scaling="Hex16">
<table name="Code" type="Static X Axis" elements="1" scaling="Hex16">
<data>Hex16</data>
</table>
<table name="Address" type="Static Y Axis" elements="10">
<data>C250</data>
<data>C252</data>
<data>C254</data>
<data>C256</data>
<data>C258</data>
<data>C25A</data>
<data>C25C</data>
<data>C25E</data>
<data>C260</data>
<data>C262</data>
</table>
</table>

<table name="Rear 02 Sim Subroutine" category="Rear_02" address="4a000" type="3D" level="1" scaling="Hex16">
<table name="Code" type="Static X Axis" elements="1" scaling="Hex16">
<data>Hex16</data>
</table>
<table name="Address" type="Static Y Axis" elements="20">
<data>4A000</data>
<data>4A002</data>
<data>4A004</data>
<data>4A006</data>
<data>4A008</data>
<data>4A00A</data>
<data>4A00C</data>
<data>4A00E</data>
<data>4A010</data>
<data>4A012</data>
<data>4A014</data>
<data>4A016</data>
<data>4A018</data>
<data>4A01A</data>
<data>4A01C</data>
<data>4A01E</data>
<data>4A020</data>
<data>4A022</data>
<data>4A024</data>
<data>4A026</data>
</table>
</table>
--- end here (do not add this line) ---

Then launch ECUFlash. The stock table data values should be (hex data):

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

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

Upload the modified ROM to your ECU, and no more rear O2 CELs.

EDIT: Removed some duplicate values.

EDIT (March 15, 2008): Cleaned up the sim subroutine code. Now four lines shorter.

I applied this patch and cleared the CEL codes. Does this patch keep the rear o2 in a not ready state? All the other systems show up as ready except for the rear o2

Jun 22, 2011 | 08:58 PM

#445

shadovarian

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From: Paducah, ky

Okay, I am already simulating the rear o2 sensor but I am getting a code form the heater. Can someone give me a part number, or link to the proper resister to use for the Evolution 8?

Nevermind, the (expletive delete - unnaturally explicit) cut the wires and I have no idea where they are.

Last edited by shadovarian; Oct 31, 2011 at 06:52 PM.

Jan 10, 2012 | 08:23 AM

#446

Tbunchtsi

Newbie

Joined: Jan 2012

Posts: 7

Likes: 0

From: Dayton Ohio

Ok i'm new to all of this. I have an 05 Evo and installed a bushur 3in turbo back exhaust. I installed the o2 spacer and cleared the code and it comes on after a cold start. It's throwing a P0137 code. Is there any tutorial or anyhting on how to i guess bypass the rear o2 sensor so it doesnt cause a code. I dont really understand how to do the ecu flash.
Thank You

Jan 14, 2012 | 11:48 PM

#447

Egal44ARock

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Posts: 83

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From: Albuquerque, NM

hope someone comes up with a ECU fix for P0137 soon for a 2010 Ralliart... im getting annoyed of the code coming back and would much rather not do a resistor mod to fix it. any input would be great if anyone has solved this for the 09+ Ralliarts

Feb 1, 2012 | 01:22 PM

#448

Dutch_IX

Newbie

Joined: Jan 2012

Posts: 5

Likes: 0

From: Amsterdam

What do i need to get rid of these OBD alarms?

Hi guys,

I have the OBD alarm P136 and P141, after removing the O2 sensor,
my ROM has the ID 88840016.

I guess I need to replace the internal heater (O2) by a resistor about 80Ohm,
about the software mod i'm not so sure.
Do i need to set the FAA bits to 56D8 and will this be enough?

Simon

Last edited by Dutch_IX; Feb 1, 2012 at 01:26 PM.

Feb 12, 2012 | 02:00 AM

#449

Dutch_IX

Newbie

Joined: Jan 2012

Posts: 5

Likes: 0

From: Amsterdam

O2 removal

My actions so far I have tried to manipulate some bits.
Like (bit 1) for faa => 56DA into 56D8 and also set the heater cel "to disable". All results in disappearing of P136 and P141 and showing up off P125.
No surprise for you guys

<table name="Rear O2" category="Misc" address="faa" type="1D" level="4" scaling="Hex16"/>
<table name="O2 Signal" category="Rear O2" address="fca" type="1D" level="4" scaling="Hex16"/>
<table name="Heater CEL" category="Rear O2" address="2ee1f" type="2D" level="2" scaling="blobbits">
<table name="Bit values" type="Static Y Axis" flipy="true" elements="8">
<data>N/A</data>
<data>N/A</data>
<data>N/A</data>
<data>N/A</data>
<data>Rear O2 Heater CEL Enable(1)/Disable(0)</data>
<data>N/A</data>
<data>N/A</data>
<data>N/A</data>
</table>
<table name="ECU_PEREPHERY2" category="ECUPeriphery" address="fca" type="1D" level="4" scaling="Hex16"/>
</table>

My question now, could the Tephra/Mfred softmod fix also do the trick for ROM 88840016 in combination with 47-82 Ohm resistor?

Feb 12, 2012 | 01:39 PM

#450

justastockevo

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Posts: 247

Likes: 2

you need a tephra rear o2 sim patch to turn off cat efficiency codes + rear o2 heater disable to turn off heater codes.

leave faa/fba/fca bits alone, return them as they are in oem firmware.

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