2004 WRX CEL - How to get code
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This is a discussion on 2004 WRX CEL - How to get code within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So I was cruising on the highway at around 60MPH in Cruise control (fifth gear) and suddenly my Check Engine ...

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    Registered User MisterNBG's Avatar
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    2004 WRX CEL - How to get code

    So I was cruising on the highway at around 60MPH in Cruise control (fifth gear) and suddenly my Check Engine Light came on (CEL does not blink at me). I didn't notice loss of power, no noises, car idles fine, no knocks, no smells, starts up from both cold and warm just fine, cruise control still works and I have boost, so where's the problem?!?!

    I've done my fair share of research on the inter-webs and found that on older gen (late 80's - 90's) Subaru's, you can plug these two green wires (Self Diagnostic wires) together, unplug the memory wires and the CEL will actually flash the code on start up. (Slow blinks = 10 and Fast blinks = 1) So I'm not sure how it is with '02 and up models, but I tried this on my 2004 Subaru WRX and the CEL just kept blinking at me, like 2 blinks per second (After replugging the memory and unplugging the green wires, the CEL stopped blinking). There were know apparent codes being flashed at me, so what seemed to work on old scoobies, does in fact, not work for the newer gen scoobies. Unless I'm doing something wrong.

    So any thoughts on what this may be? I've found a lot about misfires on with these cars, especially with the 3rd cylinder, but I think I'd know if my car was misfiring no?

    Here's a video on what I'm referring to with older gen scoobies and their self diagnostic CEL blinking thing


    All help is appreciated!

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    and the Funky Bunch Calvinball's Avatar
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    Just take it to autozone, advance auto parts, pep boys, etc. They all almost always read codes for free.
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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Calvinball View Post
    Just take it to autozone, advance auto parts, pep boys, etc. They all almost always read codes for free.
    Yeah I was trying to avoid this, I was looking for a simple DIY but it seems I've got no other choice lol

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    and the Funky Bunch Calvinball's Avatar
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    Quote Originally Posted by MisterNBG View Post
    Yeah I was trying to avoid this, I was looking for a simple DIY but it seems I've got no other choice lol
    Not unless you want to buy a scantool or an accessport yourself!
    - Will
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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Calvinball View Post
    Not unless you want to buy a scantool or an accessport yourself!
    lol well, I will be buying an AP soon, but I would rather get this issue sorted out before stage 2. I'm off to Auto zone then haha

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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Calvinball View Post
    Not unless you want to buy a scantool or an accessport yourself!
    lol well, I will be buying an AP soon, but I would rather get this issue sorted out before stage 2. I'm off to Auto zone then haha

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    He simply abides. SD_GR's Avatar
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    Do you want to make a gamble? If you're willing to risk a few $ and some time, go ahead and troubleshoot a PO171. Whether the code is PO171 or not, the troubleshooting is good practice and there is in my view a very decent chance I'm write about the code anyway. So get some MAF cleaner, an air filter if needed, and check for vac leaks etc. See PO171 troubleshooting for more info.

    Blind shot but it might work and if you can't read the code you have nothing (much) to lose.
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    Pro Manscaper Mikie13's Avatar
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    Quote Originally Posted by MisterNBG View Post
    Yeah I was trying to avoid this, I was looking for a simple DIY but it seems I've got no other choice lol
    Ha why? It's cheap, and easy...and tells you exactly what the code is in a matter of driving time minutes?

    IIRC, the AP itself isn't best at reading codes. It will...but generalizes them without being exact. Don't quote me on that though.
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    Registered User MisterNBG's Avatar
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    k just got back from Autozone, they said it's an o2 sensor, something about bank 1? it would cost me around $190 for the o2 sensor. Is this the infamous up-pipe cat going? Anyone have any ideas on this?

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    He simply abides. SD_GR's Avatar
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    You need to post an actual code. What they said doesn't help.
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    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
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    Registered User MisterNBG's Avatar
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    Ah damn I don't think he gave me a code, he said something about the catalyst and the "bank 1 o2 sensor".


    Isn't that the sensor in the headers, right before the Up-pipe?

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    Registered User MisterNBG's Avatar
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    Ah damn I don't think he gave me a code, he said something about the catalyst and the "bank 1 o2 sensor".


    Isn't that the sensor in the headers, right before the Up-pipe?

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    He simply abides. SD_GR's Avatar
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    Before you spend money on a sensor you many not need I'd urge you to post the actual code. This is because sensor are expensive an in some cases although the CEL is ostensibly for a sensor, the sensor itself is among the last things to check, and therefore among the last things to replace.

    If he says PO171 guy some MAF cleaner while you're there.
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    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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    Registered User MisterNBG's Avatar
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    Then I'm going to have to go back down to Autozone and ask for the code because he NEVER told me the code, he just said, "The o2 sensor in bank 1 is probably going bad, let me see how much they're running for... $190."

    Not sure why he didn't give me a code...

    I'll report back tomorrow with the code, I'll strangle it out of them if I have to lol!

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    He simply abides. SD_GR's Avatar
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    Try letting your fingers do the walking but that may not yield a reliable answer I suppose. It may still be a costly sensor but you do not know yet. Hopefully it is not.
    WRX Info Links, Courtesy TheJ
    The world breaks everyone and afterward many are strong in the broken places. Ernest Hemingway
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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