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Re: P0420 Trouble Code - HELP! (Pucks850T)

I just switched out my CAT for a racepipe. I used an O2 spacer but still got this code. Basically the code is telling you that the CAT isn't working properly. If you have a CAT with a lot of miles it is probably bad. If you are running a custom exhaust like I am you may just need an different O2 spacer to fool the sensor.
 
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