Catalytic converter overheating? - Page 3
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This is a discussion on Catalytic converter overheating? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by dttruax Question: would this code mean that the pre-cat is going bad, or just the mid-cat? Either, ...

  1. #31
    OMG WTF MainFrame's Avatar
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    Quote Originally Posted by dttruax View Post
    Question: would this code mean that the pre-cat is going bad, or just the mid-cat?

    Either, both, neither.. there are a lot of things that could cause that reading. Failed sensor, exhaust leak, rich or lean condition, or a problem with one of the three catalytic converters. I would not suspect that code to be thrown by a failing uppipe cat though, since you can run catless uppipe without having to worry about throwing that code.

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    The other symptoms (like the hot almost burning smell coming from under car/engine bay makes me believe the cat was overheating, etc.

    Now, there's no cat in the downpipe, correct (item "M" on the schematic on the previous page)?

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    Quote Originally Posted by dttruax View Post
    The other symptoms (like the hot almost burning smell coming from under car/engine bay makes me believe the cat was overheating, etc.

    Now, there's no cat in the downpipe, correct (item "M" on the schematic on the previous page)?


    The stock downpipe should have a catalytic converter in it..


    A lean condition can cause excessive heat. But if the car is stock I wouldn't expect it to run lean unless there's a mechanical problem somewhere.

  5. #34
    Pro Manscaper Mikie13's Avatar
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    Stock downpipes have 2 in them.

    The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
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    Quote Originally Posted by Mikie13 View Post
    Stock downpipes have 2 in them.

    So...... there's actually 4 converters on a 2004 WRX?

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    Quote Originally Posted by dttruax View Post
    So...... there's actually 4 converters on a 2004 WRX?

    Three


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    I only ask because my mechanic is having a heck of a time w/the local Subaru dealer and getting the correct part. My mechanic basically thinks the converter in the downpipe (item "M" on the subarupartsforyou schematic.... which I can't find anywhere) is bad and needs to be replaced, but Subaru sent him the mid-cat assembly (item "P").... and I think the dealer wanted over $800 for the downpipe assembly.

  9. #38
    Registered User SKI.WRX's Avatar
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    Buy used off someone who went stage 2. You can probably get the whole stock exhaust for $1-200.

    Also check the wires from the rear O2 sensor. Mine rubbed on the drive shaft and it has worn away the housing shorting the sensor on the drive shaft. I had a P0420 code and no CEL. Just passed Colorado Emissions with it that way as well.
    Last edited by SKI.WRX; 01-04-2013 at 01:50 PM.

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    Quote Originally Posted by SKI.WRX View Post
    Buy used off someone who went stage 2. You can probably get the whole stock exhaust for $1-200.

    ^this

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    Quote Originally Posted by SKI.WRX View Post
    Buy used off someone who went stage 2. You can probably get the whole stock exhaust for $1-200.

    Also check the wires from the rear O2 sensor. Mine rubbed on the drive shaft and it has worn away the housing shorting the sensor on the drive shaft. I had a P0420 code and no CEL. Just passed Colorado Emissions with it that way as well.
    Know anyone???

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    anyone know the part # for the downpipe assembly w/converter for a 2004 WRX?

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    Quote Originally Posted by dttruax View Post
    Know anyone???

    FS: (For Sale) 2005 WRX Stock Downpipe and Up pipe - NASIOC

    there are several others listed too..

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    Quote Originally Posted by MainFrame View Post
    Three

    So since there's 2 converters between the 2 oxygen sensors, it could possibly be one, either, or both that might be bad. Oh goody.

  15. #44
    Registered User UEDan's Avatar
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    Since we already suggest you replace the stock up with a catless unit....

    GET A (used) CATLESS DOWNPIPE!
    Your car is a 2004. $10 Vagcom cable + $50 XPT tune. More power, better fuel economy and no more friggen cats!

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    Quote Originally Posted by UEDan View Post
    $10 Vagcom cable + $50 XPT tune. More power, better fuel economy and no more friggen cats!


    I thought the Vagcom didn't work for flashing?

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