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Thread: Trouble Code P0420

  1. #11
    Join Date
    Jan 2006
    Posts
    2,590
    Be careful, I had the same thing happen to me a couple of years ago and they were stopped up. Not good on the motor. I was still under the emissions warranty so they replaced them free.

    Jamest
    Last edited by RedHeartbeat; 11-10-2007 at 10:11 AM.
    12 Sec. Club! SOLD
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    LQ4 6.0L, WCCH HEADS, LEVEL 5 FLT 4L80E TRANS. WITH TRANS BREAK, YANK 3200 STALL, TRICK TURBO, TURBONETICS T-76 TURBO, CUSTOM INTERCOOLED, 68lb INJECTORS, CUSTOM S/D TUNE FROM NELSON PERFORMANCE, COMP CAM 212/214 .557/.559 116+2, SNOW METH. KIT, . ALL INSTALLED AND DYNOED AT NELSON PERFORMANCE: 5**?HP @ 5073rpms and 5**TQ @ 4389rpms AT THE WHEELS WITH 10 PSI OF BOOST. ALL 3/4 TON TRUCK 5435LBS, NOTHING TAKEN OFF, STREET TIRES, AND USUALLY 2 BABY SEATS. WANNA RIDE?
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  2. #12
    Join Date
    Nov 2004
    Location
    Pleasanton, TX
    Posts
    211
    Quote Originally Posted by Jamest View Post
    Be careful, I had the same thing happen to me a couple of years ago and they were stopped up. Not good on the motor. I was still under the emissions warranty so they replaced them free.

    Jamest
    I'm thinking about taking them out and gutting them. I just dont want to mess up the sound of my exhaust. The code hasn't popped up again, so we shall see.

    2006 K1500 Vortec Max CCSB 6.0 4.10's, Nelson SD Tune, Trick Turbo kit T76 @ 10psi, 60lb/hr injectors, 4" duramax exhaust, snowmeth stage 2 kit, FLT Level 5 4L70E, Vig 2600, 40K trans cooler, 265/70/17 BFG All Terrains. 13.0 @ 102mph 1.8 60ft

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