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Rear O2 CEL Warning - Ecuflash Fix Step by Step

119K views 83 replies 32 participants last post by  milosavljevicm 
#1 · (Edited)
How to fix your ECU to remove rear O2 sensor checks and CEL warnings after de-cat.

Hi Ladies and Gentlespoons. Many of us have had a decat. Some choose to fix the CEL indication by use of a special spacer or O2 simulator. Well i found O2 simulation too complex and fiddly to wire, the cel fix spacer from the states fouls the underbody on long journeys as the exhaust expands.

There has to be a better way.....

And yes there is! Been working with grayw today to eliminate the checks for the rear O2 sensor on a standard ECU. Today i can report thats now been fixed!!

So if _Biggles_ the ECU noob can do this, so can anybody.

OK you do have a list of bits to acquire so heres the list:
  • Laptop : DUH yep no laptop no ECU chatting, beg borrow, try not to steal
  • Limitless or Tactrix Cable : So those can be gotten from Grant @ Gizzmo Electronics (support your MLR trader!) or Limitless themselves
  • Ecuflash : Superb FREE software you are going to love forever after today acquired from www.openecu.org
  • Aktivematrix ECU Unlocker : Some ECU's are locked after tuning. BOO! This unlocks them. Go to www.aktivematrix.com, sign for free account, download it!
  • ROM Definition File : Different for every evo, but go to openecu.org and hit the forums they are all there! Look for your vehicle, if you are struggling to find it, make a post, someone will help you pick the right one!
  • You might also wish to consider Mitsulogger or Evoscan as well, you can check for knock etc with those! Evoscan is not free but its excellent. Useful for checking your engine & map health :D
So thats your parts and software list! Got it all? OK lets get on with fixing the CEL warning once and for all!
 
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#37 ·
Excellent write up guys and procedure explanation,simple and crystal clear,well done!!:smthumbup:smthumbup
 
#51 ·
Hi, I´m a new member but I read much in this forum. My English is not fluent. I want to see the possibility of mapping an ECU Evo VI. I have also EcuFlash, Evoscan and reprogramming cable. When I read the Rom with EcuFlash does not show anything in the left column. I apologize if this is cleared somewhere in the forum and I appreciate any information.
 
#53 ·
You know the existence of any software capable of doing that?
 
#59 ·
Hi grayw,

88840017 is a EDM version rom id for Evo 9 2006.

This is my actual map now. 3 months ago I had 88840013 USDM version but I switch to 88840017 EDM.

I look into my periphery codes and I have in ECU periphery2 FCA bit4 enable P0300 value is 1.

This is the only thing that I did but after 100 km the cell is on again.

I do something wrong?

Thanks
 
#63 ·
This is good for evo8, but does not fix the P0421 on an AUDM9, unfortunately.
I fitted a 90 degree elbow O2 sensor adaptor (supplied from MEEK in Sydney).
This fixed the CEL and does not foul anything, when set facing foward.
I would have prefered a ROM fix (I did a lot of testing of periphery bits), but a fix is a fix.
 
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