downpipe = cel p0420 - Subaru WRX Forum
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#1 Old 08-30-2007, 08:45 PM
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downpipe = cel p0420

ok ive done the research just want a confirmation on my findings. i intsalled my downpipe 2 weeks ago and i just barely got a cel (p0420). so after research i learned i need a cel fix or i can just drive the car with the cel on right.? my car isnt in limp mode right? thanks for any feedback
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#2 Old 08-30-2007, 11:48 PM
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I would go out and get the cel fix or better yet some form of EM.... You aren't gonna kill your car but it is always good to do things right

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#3 Old 08-30-2007, 11:54 PM
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i forgot to mention i used an xpt map to reflash my ecu.
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#4 Old 02-28-2008, 12:07 PM
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a fix is good, an AP is better. it specifically eliminates that code (as well as others) that are caused by tbe. i had my tbe on without EM for probably 12K before the cel went off, then everytime i cleared it it would come back within 50 miles. the AP fixed that and more.
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#5 Old 02-28-2008, 12:10 PM
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True, but you can do the same with Enginuity / Opensource

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#6 Old 08-30-2008, 12:50 PM
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i put a catlees down pipe on my car and got the same code it a bad o2 sensor so get a new but before you do go on ebay and get a o2 sensor extenstion it pulls the sensor back so the sensor dosent pick up the bad gasses but still gets a reading i did this on my car and im now check engine light free, and the rear o2 sensor is relativly inexpensive un like the front
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#7 Old 09-20-2008, 10:19 PM
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a P0420 code is a catalyst inefficiency code, not a bad o2 sensor.
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#8 Old 09-22-2008, 02:02 AM
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But running a catless 06+ wrx without a good tune or map= Boost creep.
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#9 Old 09-22-2008, 12:20 PM
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Boost creep can not be tuned out. Only lessened. You either need to change the pill size or get a 3 port BCS to fix the problem. Its a mechanical issue. Just make sure you have it set up correctly and protuned for if you go the BCS route. Changing the pill will not require a protune.

Check out these links: - Service Bulletin: 07 WRX/STi Overboosting with Catless Exhaust - How Subaru’s Factory Boost Control System Works
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