P0420 Catalyst System Low Efficiency
#4
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Mine does the same thing all the time with my ZZP 3" Downpipe with highflow cat, I just reset it using my Aeroforce, but it only comes on when I am idling at a stoplight.
#7
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aftermarket cats sometimes cause these codes when nothing is wrong, to keep the light from coming on you can tune it out with hp tuners, purchase an 02 simulator or use the sparkplug anti-fouler trick. i dont have time to explain it but do a search for it if someone doesnt explain it before i get home. but also, there is a possibility that your cat is bad and the code is legit.
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importkiller
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09-30-2015 07:18 PM