P0420 CEL fix rear 02 sensor

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Jan 23, 2010 | 05:01 PM

rewindnottm

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From: Nottingham

P0420 CEL fix rear 02 sensor

Hi all...

I've been asked if its possible to disable the CEL for P0420 on EVO X's.

Ive looked around and there doesnt seem to be a fix anywhere, are there any engine management (not mechanical) solutions.

Thanks all

Rewind

Jan 23, 2010 | 05:47 PM

tephra

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From: Melbourne, Australia

420 can be fixed by doing the rear02 disable, which is one of the ECU_OPTIONS in ecuflash..

however for USDM cars another code pops up, we are just testing the removal of that code now...

stay tuned!

Jan 23, 2010 | 09:24 PM

verkion

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From: Over there!

Oh! Super news Tephra! O2 Slow to respond...P0139 if I remember correctly off the top of my head?

verkion

Jan 23, 2010 | 11:19 PM

E6-X

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From: earth

Is there a how to step by step tephra? Would greatly appreciate yr help

Jan 23, 2010 | 11:29 PM

tephra

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if you dont know how todo this then I wouldn't attempt it until its confirmed as working.

Jan 23, 2010 | 11:41 PM

xPRimNT

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After some testing and a few "confirmed" reports, I'm sure there will be details available E6X.

Jan 24, 2010 | 12:14 AM

evil03

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From: west coast

if your tuned get it turned off.... if not... o2 simulator works hard wired in to the o2 sensor and o2 spacer work very well as well and is cheap

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Jan 24, 2010 | 08:34 AM

rewindnottm

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From: Nottingham

using ECUflash i have 1 to 7 ECU option sets.

which option set is it and what "bit.#' is it, assuming that it should be set to 0,

thankyou

Jan 24, 2010 | 11:01 AM

E6-X

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From: earth

Quote:

Originally Posted by tephra

if you dont know how todo this then I wouldn't attempt it until its confirmed as working.

" mama says don't know, don't touch ! "

thx for the response tephra . . . and also xprimnt

patiently waiting to get rid of

P0420 Catalyst System Efficiency Below Threshold Bank 1 $7E8

Jan 24, 2010 | 11:07 AM

#10

RaysEvoX

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From: Back in PA.

Like evil03 said, just get a O2 spacer and it should(95% of the time) go away. I had the same problem. Bought the spacer from AMS and it hasnt popped up since.

Jan 24, 2010 | 01:06 PM

#11

hackish

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From: Canada

I might have a fix for you guys as I located the settings for that test on a different rom. I've just been testing a tool I wrote that auto-extracts all the settings from an unknown rom. If I can get a database from one of you fellow disassemblers I can run the plugin on it and see if it uses the same code as the colt turbo. The patch has been tested on that and it works.

-Michael

Jan 24, 2010 | 03:57 PM

#12

criptballer

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From: Utah

this could be heaven for some of us who have tried absolutely everything and can't get those annoying *** codes to stop coming on! subscribed, waiting on tephra now!

Jan 24, 2010 | 04:42 PM

#13

tephra

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From: Melbourne, Australia

well im waiting to hear back from HBSpeed OR xPRimNT to see if the fix for the fix works

Jan 24, 2010 | 06:45 PM

#14

xPRimNT

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From: Edmonton, Alberta

Late tonight! Driving home now (wrong car).

Jan 24, 2010 | 07:22 PM

#15

hackish

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From: Canada

Quote:

Originally Posted by tephra

well im waiting to hear back from HBSpeed OR xPRimNT to see if the fix for the fix works

Hey tephra, shovel me off a copy of the rom you work on and I'll see if I can match the routine against my database. I haven't done much stuff on the evo X/ '09 ralliart roms yet but I'm willing to bet they used the same code base as everything right down to the pajero seems to decompile to the same base code. hackish@gmail.com. I'm using a legit version of IDA so you might have to send an IDC file. I'm still working on the pattern matcher but at present I've got about 80% of the routines matching something in the database.

Code:

ld      R1, @((off_BAC4 - 0xBA48), R9) ; Load
sth     R10, @R1 || nop ; Store halfword
ld      R1, @((off_BBDC - 0xBA48), R9) ; Load
sth     R10, @R1 || nop ; Store halfword
ld      R1, @((off_BBE0 - 0xBA48), R9) ; Load
ld24    R4, #cat_efficiency ; Load 24-bit immediate
lduh    R2, @R4         ; Load unsigned halfword
sth     R2, @R1         ; Store halfword
ld      R1, @((ptr_cat_efficiency_limit - 0xBA48), R9) ; Load
lduh    R0, @R1         ; Load unsigned halfword
mv      R1, R11         ; Move register
bl.l    div_u16_u16_round ; Branch and link
bl.l    clipat_ff       ; Branch and link

A patch shouldn't really be necessary - just adjust the value.

-Michael

Last edited by hackish; Jan 24, 2010 at 08:01 PM.

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