p0420 cat converter
#1
04-08-2011, 08:42 PM
#2
04-08-2011, 09:22 PM
Record Breaker
If you want to remove it all together you will have to live with that P0420 code until you get it replaced. It is more efficient just to replace the CAT but if the funds aren't there then you gotta do what you gotta do.
Basically what the Pre-CAT (Upstream) does is monitor the air/fuel mixture and tells the PCM what adjust whether it be add more fuel or air to the mixture. The Post-CAT (Downstream) sensor (the one that's sending the code) monitors air/fuel mixture also but is there solely to make sure the CAT is performing efficiently. If the PCM recognizes that the readings from both the Upstream and Downstream are too similar, it tells the PCM that the CAT isn't doing its job correctly.
If you can imagine what eliminating the CAT completely would do, all it would do is send codes like there's no tomorrow, not to mention you'd probably lose some back-pressure and gas mileage.
In order to correctly remove the CAT you'll have to get an O2 sensor simulator that basically fools the computer that the O2 sensor is out of there and sends bogus information pre-determined by a chip.
Make sure if you go the route of replacing the CAT that you just get a regular stocker and not some little dinky "High-Flow" CAT because the stock CAT is "High-Flow".
Also, seeing as you live in Washington, I'm not sure if your area does but some area in the state do emissions testing and if that's the case forget about ditching the CAT. Unless you really know what you're doing it will just be easier to replace the CAT and call it day rather than gutting it and welding the shell on.
Basically what the Pre-CAT (Upstream) does is monitor the air/fuel mixture and tells the PCM what adjust whether it be add more fuel or air to the mixture. The Post-CAT (Downstream) sensor (the one that's sending the code) monitors air/fuel mixture also but is there solely to make sure the CAT is performing efficiently. If the PCM recognizes that the readings from both the Upstream and Downstream are too similar, it tells the PCM that the CAT isn't doing its job correctly.
If you can imagine what eliminating the CAT completely would do, all it would do is send codes like there's no tomorrow, not to mention you'd probably lose some back-pressure and gas mileage.
In order to correctly remove the CAT you'll have to get an O2 sensor simulator that basically fools the computer that the O2 sensor is out of there and sends bogus information pre-determined by a chip.
Make sure if you go the route of replacing the CAT that you just get a regular stocker and not some little dinky "High-Flow" CAT because the stock CAT is "High-Flow".
Also, seeing as you live in Washington, I'm not sure if your area does but some area in the state do emissions testing and if that's the case forget about ditching the CAT. Unless you really know what you're doing it will just be easier to replace the CAT and call it day rather than gutting it and welding the shell on.
Last edited by WhiteWidow00; 04-08-2011 at 09:24 PM.
#5
04-08-2011, 09:33 PM
yeah id prefer to go with the cheeper route of doing it myself... i found this http://www.jcwhitney.com/universal-c...id=d417y1998j1 its like 90 bucks... would that work... i would prefer not to spend 200 bucks currently