Any ideas where to start??
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This is a discussion on Any ideas where to start?? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; had me cel checked today it came up PO420. Is this from the catless dp? The guy told me to ...

  1. #1
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    Any ideas where to start??

    had me cel checked today it came up PO420. Is this from the catless dp? The guy told me to check for a vaccum leak. anyone else had this code?

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    Registered User Destros's Avatar
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    That guy is an idiot and probably sucks eggs. Vacuum leaks will trigger a lean code. P0171 (Bank one sensor one).

    Even if you stick in race cats (post turbo) and you do not throw MIL codes for a while, it WILL eventually come on. P0420 to be exact:: catalyst inefficiency. Sometimes it can take up to eight or nine months for the computer to notice the change. The computer has set standards as to how much exhaust flow there should be. When you put in a catless pipe the comp sees this vast increase in flow, because there is no more cat to restrict, and sets the code. Same thing with race cats. Get a mechanical O2 simulator. You can buy em for less than $30.00 bucks plus some change. It's like a two inch threaded tube, of sorts. This screws into where the sensor (post catalyst) would, then you screw the sensor into this. It moves the sensor away from direct flow so even without cats it read as normal and will not sense a fault. As far as the uppipe, it is a wonderful upgrade. If you are trying to keep the EGT sensor for input, I believe it should read normal with a performance uppipe. If you're getting one without an EGT bung, put in 'I believe' a 2.2k ohm resistor where the EGT sensor socket would plug in, and everything will read as normal.
    Last edited by Destros; 03-09-2008 at 09:46 AM.
    -created in the ominous shadow of The Great Vassar-
    Blobeye Syndicate #Eleventy-Seven

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    Registered User Destros's Avatar
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    If you can't find a simulator, I have a few here at home. PM me if you need one.
    -created in the ominous shadow of The Great Vassar-
    Blobeye Syndicate #Eleventy-Seven

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