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P0401 and p0420

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Old Jan 19, 2008, 12:04 PM
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P0401 and p0420

one is the insufficient egr flow and the other is catalyst efficiency below threshold(bank 1). what can i do to fix these codes. someone to me to take off my egr valve and clean it. is that true??? i need help. i just installed a test pipe so i believe thats where the p0420 comes in correct???
Old Jan 19, 2008, 10:49 PM
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Old Jan 19, 2008, 11:00 PM
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buy the CEL FIX Kit for like 5 bux and that should take away the 420. u can also find them on ebay.
Old Jan 19, 2008, 11:03 PM
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yea i figured id need the cel fix. what should i do about the p0401
Old Jan 20, 2008, 09:11 AM
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Check your EGR valve and make sure the vacuum line didn't blow off. It's a common problem among Evo's. Search a little and there's a thread with pictures.
Old Jan 20, 2008, 10:20 AM
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thanks man. see you are a carolinian. wheres the closest place in nc to get e85
Old Jan 20, 2008, 12:09 PM
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http://www.e85refueling.com/location...rth%20Carolina

Unfortunately it's not widely available in NC yet. On the other hand I have 2 stations within 20mins from me
Old Jan 20, 2008, 12:18 PM
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thats awesome. i want us to get e85 here or somewhere near here. i found a thread on how to take care of the egr valve. i need to find out how much an egr block off plate costs. id rather just block it off that way i dont have to worry about the code reappearing. does anyone know if you can find a o2 fix at the parts stores.
Old Jan 20, 2008, 12:30 PM
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Originally Posted by 20Grockit
thats awesome. i want us to get e85 here or somewhere near here. i found a thread on how to take care of the egr valve. i need to find out how much an egr block off plate costs. id rather just block it off that way i dont have to worry about the code reappearing. does anyone know if you can find a o2 fix at the parts stores.
All you need to do for the EGR issue is to zip tie the line on there. I haven't had mine blow off since I've done that.

For the o2 fix, go to the parts store and look for the anti-spark plug foulers. Take one of them and drill it almost all the way through and leave the other one like it is. Plug the o2 sensor into the one you drilled into, then screw that one into the other fouler. After that you just screw it into your exhaust and your problem should be solved. $4 fix
Old Jan 20, 2008, 12:34 PM
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Originally Posted by dsmfan95
All you need to do for the EGR issue is to zip tie the line on there. I haven't had mine blow off since I've done that.

For the o2 fix, go to the parts store and look for the anti-spark plug foulers. Take one of them and drill it almost all the way through and leave the other one like it is. Plug the o2 sensor into the one you drilled into, then screw that one into the other fouler. After that you just screw it into your exhaust and your problem should be solved. $4 fix
check your pm, i got a carolina question for ya
Old Jan 20, 2008, 02:23 PM
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so the spark plug anti-foulers will work on the o2 sensor??? the guy at the parts store told me they wouldnt work. i just went up there to try and get one.
Old Jan 20, 2008, 02:27 PM
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Check out the how-to spark plug anti fouler thread in the How-to's, and get that exact part and it will work, it has to be just right though. I would just get the o2 sim and remove the second o2 sensor from the car.
Old Jan 20, 2008, 03:06 PM
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Originally Posted by 20Grockit
so the spark plug anti-foulers will work on the o2 sensor??? the guy at the parts store told me they wouldnt work. i just went up there to try and get one.
They work, they usually keep them on the shelf. There's a writeup on how to do it.
Old Jan 20, 2008, 03:40 PM
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ok got the antifoulers and got it installed and cleared the code on it. now all i have to take care of is the p0420. should i just take the egr valve off and clean it if none of the lines are disconnected??? thanks for all the help and input guys.
Old Jan 20, 2008, 06:01 PM
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