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Old 10-03-2003, 12:00 PM   #1
kbcr3
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Default 2004 wrx check engine light fix

I'm going to be putting a new exhaust system on my 2004 wrx this week, but I'm concerned about the 'check engine light' issues surrounding a catless exhaust. I'm going to have one cat in the downpipe, but none thereafter. I see there are fixes out there for the 2003 and earlier WRX's but what will fix the CEL for the 2004 without getting my ECu reflashed? Please Help!
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Old 10-03-2003, 12:05 PM   #2
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This isn't really the best forum for this, check the Factory 2.0 Turbo forum. Do a search before posting as this has already been discussed there numerous times. I don't know what the latest status of this issue is beyond that the earlier fixes did not work on the '04s and the vendors were working on a new version. By this time there may be something available that will work for you.
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Old 10-03-2003, 04:00 PM   #3
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I just completed my turboback exhaust and it was totally catless. so far i havent got a check engine light. install your exhaust and plug the oxygen senor into your mid-pipe and if you get a CEL just get a MIL eliminator.
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Old 10-03-2003, 04:07 PM   #4
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Robert, the problem is that the "fixes" for '03 and earlier don't work on the '04s.
As for your situation if you now have a totally catless exhaust you can expect to get the P0420 code eventually. It just depends on the type of driving you do since the ECU performs its catalyst efficiency tests only during steady-throttle operation such as sustained highway speed.
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Old 10-03-2003, 04:15 PM   #5
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Use a 1/2 or 1/4 watt 1Mohm resistor inline the rear O2 wire. Details are posted over at clubwrx.net.
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Old 10-04-2003, 11:06 PM   #6
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I have all catless and no cell yet
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Old 10-05-2003, 03:40 PM   #7
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how long have you been going catless? Are you doing any steady speeds?
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Old 10-06-2003, 11:17 PM   #8
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Quote:
Originally posted by xtmx
Use a 1/2 or 1/4 watt 1Mohm resistor inline the rear O2 wire. Details are posted over at clubwrx.net.
Hmm... Let me check it out and find some info about a CEL fix for 2004.

Okay people, once again the MIL eliminator does not work for 2004 WRX'. There might be something out there so we'll see.
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Old 10-07-2003, 06:09 AM   #9
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I just don't want the damn light flashing. I've already been told about the reflashes, but thats not an option. Any help would be appreciated.
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Old 10-07-2003, 08:47 PM   #10
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go to scooby sport of england and get there check engine light
fix
www.scoobysport.co.uk
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Old 10-08-2003, 02:41 AM   #11
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Quote:
Originally posted by kbcr3
how long have you been going catless? Are you doing any steady speeds?
nope i do 4-6rpm on the freeway and sometime go over 8rpm by accident i had it for 2-3 weeks now

maybe you got something losen?
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Old 10-08-2003, 08:57 AM   #12
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I'm looking into the ScoobySport Electronic fix for the CEL, but I can't find where they are sold in the states. Is the best bet to order from them directly in England? Will it fit on a 2004 WRX?
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Old 10-08-2003, 10:08 AM   #13
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I just emailed Scoobysport UK and they said that the CEL fix is 67 pounds ($111.35 USD) shipped via DHL. I asked them about my WRX 2004 twice and they didn't confirm it nor deny it. So I'm assuming it works. Dang for $111.35 USD it better work.

Did any of you 2004 owners try the Scoobysport fix? Pretty pricey. I'll just save that $111.35 towards a Cobb Stage 2 reflash though.
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Old 10-08-2003, 10:29 AM   #14
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Take the lightbulb out, put tape over the light, or wear your CEL like a badge of courage dammit. What is the big problem? You people all worry too much.

jb
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Old 10-08-2003, 10:48 AM   #15
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The issue is that I live in the armpit of america, New Jersey, and we have these great inspection laws that say that any car made after 1996 and has the check engine light lit, automatically fails inspection. You can say that you've gone to the dealership a thousand times and it still comes back on. they don't care. I just don't want to be one of the guys. And in the immediate future, I just don't feel like having a light flash at me. I am willing to pay the 111 bucks for the check engine light fix, I just don't want that damn light flashing at me all day.
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Old 10-08-2003, 10:49 AM   #16
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Can anyone confirm that the CEL fix works on the 2004 WRX? I'm gonna try to email them and see if they give a staight answer.
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Old 10-08-2003, 11:33 AM   #17
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Quote:
Originally posted by kbcr3
The issue is that I live in the armpit of america, New Jersey, and we have these great inspection laws that say that any car made after 1996 and has the check engine light lit, automatically fails inspection. You can say that you've gone to the dealership a thousand times and it still comes back on. they don't care. I just don't want to be one of the guys. And in the immediate future, I just don't feel like having a light flash at me. I am willing to pay the 111 bucks for the check engine light fix, I just don't want that damn light flashing at me all day.
Well, you have 4 years to figure it out.

Last edited by MisterWRX; 10-08-2003 at 11:59 AM.
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Old 10-08-2003, 11:49 AM   #18
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point noted!!
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Old 10-09-2003, 04:34 AM   #19
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Remember, too, that a "fix" that keeps the CEL off may still result in abnormal readouts on the OBD-II and cause your car to fail testing anyway.
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Old 10-09-2003, 02:08 PM   #20
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Quote:
I live in the armpit of america, New Jersey
Hey! I'm from Central Jersey. Now I live in New Hampshire.
Trust me, it's not as armpit as you might think. Take a road trip a few hours North. You'll start to appreciate NJ a lot more.


Has anybody tried using the '02-'03 CEL eliminator resistor on an '04 WRX? I'll be installing my catless uppipe and downpipe soon.
Will the reflash get rid of the CEL? I have a Cobb Stage 2 reflash coming soon, too.
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Old 10-09-2003, 02:19 PM   #21
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Quote:
Originally posted by slingshot

Hey! I'm from Central Jersey. Now I live in New Hampshire.
Trust me, it's not as armpit as you might think. Take a road trip a few hours North. You'll start to appreciate NJ a lot more.


Has anybody tried using the '02-'03 CEL eliminator resistor on an '04 WRX? I'll be installing my catless uppipe and downpipe soon.
Will the reflash get rid of the CEL? I have a Cobb Stage 2 reflash coming soon, too.
I love New Jersey! I'm moving to Florida though in January and I know I'll miss Jersey.

Anyway, the MIL Eliminator will not work for the 2004s. They are in the testing stages of it though. The only thing that works is the $111 fix from Scoobysport UK and a Cobb Reflash.
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Old 10-09-2003, 02:41 PM   #22
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I was going to have my downpipe and exhaust installed this morning, but the mechanic (Midas) said that they can't do it because they are not allowed to remove cats without replacing them with something else. Then they wouldn't even check so see if i had an exhaust leak. I think they just have a slot between their legs. So, the check engine light issue will not be an immediate issue in my life for a few more weeks, but at least we now have a good source of info on how to fix the problem. thanks misterwrx!
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Old 10-09-2003, 02:53 PM   #23
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They weren't pulling your leg. A shop isn't supposed to remove a functioning cat. It's considered tampering with the emission system and is a federal violation. A corporate chain like Midas is not going to take chances by doing this type of work.
You'll need to do it yourself, or find an independent installer who can do it. I know there are several in the Tri-State area, check in the Tri-State forum and/or send me a PM.
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Old 02-12-2005, 08:28 PM   #24
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Ponyexpress cel eliminator worked perfectly on my 04 wrx that was throwing the same cel code reference earlier. I think it was 15 bucks on their website and really easy to install, just be sure to get the special o2 sensor tool to remove it from the cat (can be found at pepboys, autozone etc.)
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Old 02-12-2005, 09:12 PM   #25
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all this talk of CEL fixes and nobody mentioned the one thing that easier to install, cheaper to buy, more readily available, doesn't require wiring, and works better for all year cars...

the mechanical O2 fix:
Get some "HELP!" brand spark plug antifoulers (see pic) from any parts store. You need 42009 or 42002. Take one of them... use a 1/2" drill to enlarge the center hole (it's soft metal so it's easy) and then screw it into the other one and then screw this assembly into your pipe and screw the O2 sensor into it. Super easy, super effective, super cheap.

If you can't handle a drill, you can buy one of these things from ike GTSpec or GPMoto or something for $30.




I know plenty of people (including myself) that have been using these with catless exhausts for many many thousands of miles with no cels.
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