CAT Question p0420
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CAT Question p0420
I just had a p0420 code pop up and it turns out that I have a broken manifold stud [no surprise there] and my Bank 1 cat is bad. O2 sensors were fine.
Truck is a 2004 Durango with 5.7 about 83K for miles.
I was wondering if anyone knows if a cheap magnaflow CAT will work without throwing codes, or are these trucks known for needing the OEM CAT? i really do not want to spend $300 on a factory CAT when i can get a good high flow magnaflow or the like for $60 and weld it in. I have had no problem with the Magnaflow CAT on my second gen RAM but you never know. Some of these computers are touchy. That and If the computer senses the flow rate is different from the one side to the other [bank 1 to bank two, not front to back] will it care? I have a superchips and was considering just removing the CATs anyway [I live in Florida now, no IM] but I have heard that this can really kill the gas mileage for not much gain. If I am going to pay $3-400 for a CAT, I would rather fork over the other $1400 and get a nice new dual exhaust... Not worried about the stud, it was te one closest to the firewall on the passanger side so it looks lie I can go in from the wheel well, remove the manifold, broken stud, have it surfaced and replaced no problem. Cost me $2 for the stud and $20 to get the thing surfaced [just good habit, i figure if something broke and it ticking like that its probably a bit warped too from all the heating up and cooling down...]
Thanks.
Truck is a 2004 Durango with 5.7 about 83K for miles.
I was wondering if anyone knows if a cheap magnaflow CAT will work without throwing codes, or are these trucks known for needing the OEM CAT? i really do not want to spend $300 on a factory CAT when i can get a good high flow magnaflow or the like for $60 and weld it in. I have had no problem with the Magnaflow CAT on my second gen RAM but you never know. Some of these computers are touchy. That and If the computer senses the flow rate is different from the one side to the other [bank 1 to bank two, not front to back] will it care? I have a superchips and was considering just removing the CATs anyway [I live in Florida now, no IM] but I have heard that this can really kill the gas mileage for not much gain. If I am going to pay $3-400 for a CAT, I would rather fork over the other $1400 and get a nice new dual exhaust... Not worried about the stud, it was te one closest to the firewall on the passanger side so it looks lie I can go in from the wheel well, remove the manifold, broken stud, have it surfaced and replaced no problem. Cost me $2 for the stud and $20 to get the thing surfaced [just good habit, i figure if something broke and it ticking like that its probably a bit warped too from all the heating up and cooling down...]
Thanks.
Last edited by etdavenport; May 15, 2012 at 02:31 AM.
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From: Sioux Falls, SD
How did you determine your O2 sensors were fine? My wife's pre-cat sensors were bad before 81k when we bought it (2006 Durango), and they didn't throw a code.
It had an occasional misfire. Replaced passenger side, and had severe misfires, extremely rough idle, etc. Posted a driver's side O2 code. Replaced that one, and she ran better then when we bought her. The sensors can get really sloppy, and the PCM won't throw a code. Not saying its your only problem, but I bet its part of it.
Dodge/Chrysler oxygen sensors should be replaced every 80k-100k, from what I've read and seen. And don't use Bosch or Standard brands, or no-name house brands. Denso or NGK/NTK are the way to go here. Sometimes they are a little more expensive, but their quality control is way better.
It had an occasional misfire. Replaced passenger side, and had severe misfires, extremely rough idle, etc. Posted a driver's side O2 code. Replaced that one, and she ran better then when we bought her. The sensors can get really sloppy, and the PCM won't throw a code. Not saying its your only problem, but I bet its part of it.
Dodge/Chrysler oxygen sensors should be replaced every 80k-100k, from what I've read and seen. And don't use Bosch or Standard brands, or no-name house brands. Denso or NGK/NTK are the way to go here. Sometimes they are a little more expensive, but their quality control is way better.
Last edited by jasonw; May 16, 2012 at 12:42 AM.