WadeTustian Posted March 15, 2013 Report Share Posted March 15, 2013 well had my misfire codes that im sure some of you remember got all that fixed, then recently i got a check engine light, was a p0420 catalyst threshold below bank 1. im getting extremely bad gas milage for such a small car, like 250km per tank from a 1.8 litre......i know my cars running rich and im getting a new 02 sensor for the front tommorow, hopefully that will help, but will a bad cat cause this bad gas milage? should i try taking it off and cleaning it rather then dropping 300$ 2007 Mazda 3 Sedan Pioneer 80-prsB2 Zero.7 2 15s 4inch coil psi recones temp til my subs are reconedFocal P165-v15Audison voce quattro fully activeOnly gonna get louder 146.1 at 38hz 138.x at 24hzBuild log http://www.stevemeadedesigns.com/board/topic/191444-mazda-3-sedan-sql-build-audisonfocalb2aa/ Link to comment Share on other sites More sharing options...
Jayce Carlucci Posted March 23, 2013 Report Share Posted March 23, 2013 p0420 means catalytic converter is clogged. Time for a new one. if you do not change it you will continue to lose power until your car will actually not propel forward Link to comment Share on other sites More sharing options...
crispy_chick3n Posted March 23, 2013 Report Share Posted March 23, 2013 p0420 means catalytic converter is clogged. Time for a new one. if you do not change it you will continue to lose power until your car will actually not propel forward NO NO NO NO!!!!!! a clogged cat wont make your car not move. although it isnt the best thing for them. you can pick up a cheap aftermarket cat for like 60-80 bucks, and with some welding skills you can cut the old one out and put the new one in in about an hour, or if you dont have a welder, you can always clamp it on. it needs replaced. there is no real good way to clean it out without destroying it. This page is crispy_chick3n approved. © crispy_chick3n inc Link to comment Share on other sites More sharing options...
Cboeger Posted April 10, 2013 Report Share Posted April 10, 2013 You need a new one, I have to get a new one for my Ford Focus next week, trust me it's worth it in the end, you won't lose power while trying to accelerate, especially going uphill and also you'll get better MPG and getting a new o2 sensor is oreillys/autozone talk, you need a new cat, although it would be beneficial to replace your o2 sensors while replacing your cat. Link to comment Share on other sites More sharing options...
Nico Shull Posted April 14, 2013 Report Share Posted April 14, 2013 Please do the right thing and replace the components that need replacing. I have never seen anything good from "cleaning" a catalytic converter, or O2 sensors for that matter. Always better to err on the side of caution and go with new components! 2004 Ford Freestar SEL Jensen VM9224BT Alpine MRP-F257 "Flex 5" MBQuart ONX 1000.1D Factory Ford 5x7's (For now) 2 - MBQuart ONX304 12" Subwoofers Link to comment Share on other sites More sharing options...
crispy_chick3n Posted April 14, 2013 Report Share Posted April 14, 2013 Please do the right thing and replace the components that need replacing. I have never seen anything good from "cleaning" a catalytic converter, or O2 sensors for that matter. Always better to err on the side of caution and go with new components! ive seen someone who cleaned out their cat with some kind of chemical (cant remember the name) and it left a nice residue, and it actually caught fire from the heat. lets just say that car is no longer in existence. you can clean o2 sensors and they will be fine, but they may not perform like they should, throwing codes once again. O.P. just pony up the dough and replace them, its worth it in the long run. This page is crispy_chick3n approved. © crispy_chick3n inc Link to comment Share on other sites More sharing options...
white4d96 Posted May 9, 2013 Report Share Posted May 9, 2013 If you don't have to pass emissions, you may be able to run a test pipe in place of the cat. You would, however, need to run a rear o2 fix (either an emulator, or a restrictor; I used a sparkplug non-fouler for mine) to cheat the car into thinking a functional cat is in place. Too many projects, too little time... Link to comment Share on other sites More sharing options...
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