P0420 code being thrown more often now
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P0420 code being thrown more often now
I am running a megan test pipe with STM extended o2 spacer. I haven't had any problems with the p0420 code being thrown other than every 10k miles or so. Well now I am getting the code every 100-300 miles or so.
What would cause it to be thrown all of a sudden so often? I have about 100k miles on my evo and I'm thinking maybe it's time to change the 2nd o2 sensor. Would that cause the code to be thrown?
I know the code is because it is seeing the same exhaust gasses as the 1st o2 sensor but why all of sudden now it's throwing it more often. I checked the o2 and spacer and everything is on there correctly.
Maybe I should try an angled defouler?
Thanks
What would cause it to be thrown all of a sudden so often? I have about 100k miles on my evo and I'm thinking maybe it's time to change the 2nd o2 sensor. Would that cause the code to be thrown?
I know the code is because it is seeing the same exhaust gasses as the 1st o2 sensor but why all of sudden now it's throwing it more often. I checked the o2 and spacer and everything is on there correctly.
Maybe I should try an angled defouler?
Thanks
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