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  1. #1 p0420 code on 
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    Seems i got a drop in converter efficiency in B1S2. I do have a magnaflow hi-fo cat installed a few months back when i had the pacesetter headers installed but just recently this DTC came on. i currently have it as No-Reporting in the PowrTuner, but was wondering if its a cause of concern, seeing that its the Post-Cat and not the Pre-Cat.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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    SS-DD Level Member IndeedSS's Avatar
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    Quote Originally Posted by fst View Post
    Seems i got a drop in converter efficiency in B1S2. I do have a magnaflow hi-fo cat installed a few months back when i had the pacesetter headers installed but just recently this DTC came on. i currently have it as No-Reporting in the PowrTuner, but was wondering if its a cause of concern, seeing that its the Post-Cat and not the Pre-Cat.
    Not to worry. Setting that code to no reporting is fine, when you have a hi-flow cat.
    04 Indy SS build #972 - Traded
    2010 Camaro SS LS3
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    thanks for the info
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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    GXP Level Member Zef_66's Avatar
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    Yeah, I wouldn't worry about it. I have a magnaflow high flow cat and never got this code. But if I did, I wouldn't worry. Many people totally get rid of their after cat O2 since it doesn't do a thing but put up those stupid lights from time to time.
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