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09-13-2010, 03:45 PM | #1 |
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Join Date: Sep 2008
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SCIC
Location: san diego CA
Vehicle:2004 WRB WRX wagon VF-37 twin scroll on E85! |
ECU's interchangeable?
I need a new ECU for my 04 wrx and I found another ecu from a 04 wrx can they be switched around even if the numbers don't exactly match?
Thanks Mike
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09-13-2010, 03:50 PM | #2 |
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NWIC
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I had the same question for an 02 wrx and that ecu worked just fine. I was told the numbers didn't match because they were from different manufacturing dates and not because it was from a different year vehicle.
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09-13-2010, 04:00 PM | #3 |
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Tri-State
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Vehicle:2009 STI Black |
I have an 04 computer in my 2005 car. It should work fine. Granted mine is a different year computer, I don't see why a 2004 computer wouldn't work in your 2004 car.
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09-13-2010, 04:03 PM | #4 |
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Member#: 225361
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Chapter/Region:
MAIC
Location: ashburn, va
Vehicle:2006 wrx sti beige |
Just make sure you don't end up getting a stolen ECU.
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09-13-2010, 04:33 PM | #5 |
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You can use any 02-05 ECU on any 02-05 WRX (provided the same transmission).
HOWEVER, For example, 03 added a sensor the 02 didn't have. So an 03 ECU in an 02 with throw a CEL. Same goes for the 05. Thus, an 05 ECU in an older car with run fine, but throw a CEL. To be safe, run an ECU from your year, OR OLDER. Hoever, 04 ECU in an 04 or 03 will work. |
09-13-2010, 04:56 PM | #6 |
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Location: Pennsylvania
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Going along with the above post...
The ECU pinouts are available online. As an example a small piece of wire will jump out the 'PCV Diagnostic Sensor' that is in some +04 year models and defeat the associated CEL code. OP--if you get that this point where to do swap ECU's just post up the code and an easy solution can be found. |
09-13-2010, 04:58 PM | #7 |
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RMIC
Vehicle:2006 92x Aero |
I ran an '02 ecu in my '04 for a couple years. Worked great.
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09-13-2010, 05:08 PM | #8 |
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SCIC
Location: san diego
Vehicle:2004 jewbaru jewbuilt, polish tuned |
i would rather get a 32bit sti ecu and have it protuned
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09-13-2010, 05:10 PM | #9 |
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09-13-2010, 05:13 PM | #10 |
Scooby Specialist
Member#: 42376
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RMIC
Vehicle:2006 92x Aero |
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09-14-2010, 12:21 AM | #11 |
Scooby Specialist
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Join Date: Sep 2008
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SCIC
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Vehicle:2004 WRB WRX wagon VF-37 twin scroll on E85! |
sweet thanks guys!
mike |
09-12-2022, 02:41 PM | #12 |
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2016 wrx
Hey you guys I have 2016 wrx cvt and was going to swap the ecu cluster unit and key but I can't find one for my year. Would a 2017 ecu work
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09-12-2022, 05:19 PM | #13 |
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Is there anyway to get rid of the ECU throwing a CEL?
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10-08-2022, 09:53 PM | #14 |
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Chapter/Region:
MAIC
Location: frederick, md
Vehicle:2004 wrx Dom3/IAG built hybrid |
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