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P0420 Catalyst System Low Efficiency ????

5K views 7 replies 6 participants last post by  compressor man 
#1 ·
any ideas?

i've reset it a couple times, still keeps comming on. could it have anything to do with a y pipe and high flow cat that i installed over the summer?
 
#2 ·
......most likely. It'll throw it if you have no cats as well.
 
#3 ·
is there anything i can do or am living with a check engine light?
 
#5 ·
That's the same code I had when my Passenger-side cat went bad. It may be throwing a code due to the high-flow cat. I'd try the non-fouler mod before you change the cat.
 
#7 ·
#8 ·
I had a p0430 cat bank 2 code come up a couple times while towing my trailer across country. I had my BBK shortys and mag Y installed before the trip and changed from the Edge to the SC tuner, and got this code 3 times in 2800 miles. Hasn't come back since I stopped towing.
 
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