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Thread: Trouble Code P0420

  1. 11-08-2007 12:46 AM #1
    Sambo
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    Trouble Code P0420

    A couple of days ago my service engine soon light randomly came on. Pulled the code with my scan gauge and it was P0420. I called my buddy thats a tech at the dealer and he just said that it was to do with the cats not working right. I cleared the code and yesterday when I went to town again it came back on, same code. I have the dynatech headers and cats. I was wondering if anybody else has had this code with the dynatech cats? I think they only have 7-8k on them. I wouldn't think one would be bad already. But if thats the case im just gonna take them off and gut them or just do away with them completly and have Allen delete the rear 02 sensors. If anybody has any suggestions or comments you have the floor.

    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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  2. 11-08-2007 12:49 AM #2
    ff_jeff Guest
    re-tune have nelson fix it
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  3. 11-08-2007 08:21 AM #3
    1slo4.8's Avatar
    1slo4.8
    1slo4.8 is offline Senior Member
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    yeah re-tune!!!
    2009 CHEVROLET 1500 with a MONSTER 4.8 between the frame rails!!

    Tuned by LSX Powersports ~ 4.10 ~ JBA Shorties ~ 4" Inlet/Outlet Spintech ~ Airaid Coldair
    CST 3.5" Spindles ~ Camburg Upper Control Arms ~ 2.5" CCM ~ FFR Tie Rods
    Full Throttle Suspension 3" Lift Blocks ~ Soft 8s wrapped in LT285/70/17 Silent Armors
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  4. 11-08-2007 10:19 AM #4
    dropt4by
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    i think i had that code but with factory cats and luckily i was still under the emissions warranty so they replaced them. what type of warranty does dynatech have??? maybe theyll replace em?
    2003 silverado z71 rcsb 5.3 4L60E k&n intake system, gibson super truck exhaust, pcmforless tune, custom alpine stereo, hellwig sway bars fromt and rear, 3in drop in the front 4 in out back, powerslots f & r hawk pads. truck was intended to autocross, tow and bring the trophies home......
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  5. 11-08-2007 11:07 AM #5
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    Just have the rear 02 sensor feedback turned off in the tune. You can leave them hooked up, just have the codes turned off. You don't need them, they are only there to let you know if the cats are working according to stock specs.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  6. 11-08-2007 08:03 PM #6
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    r6z4o6
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    p0420 is a dead ringer for bad cats...the rear and front sensors are reading hte same on (ie cat is doing nothing) the side with number one cylinder (bank one)
    1991 Silverado ECLB
    LM7-T56
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  7. 11-09-2007 04:09 AM #7
    Sambo
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    Quote Originally Posted by r6z4o6 View Post
    p0420 is a dead ringer for bad cats...the rear and front sensors are reading hte same on (ie cat is doing nothing) the side with number one cylinder (bank one)
    Cool, well if it is a bad cat I dont know if I will replace it or not. I wouldn't think it would hurt anything leaving the "bad cat" alone and tuning it out would it?

    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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  8. 11-09-2007 08:27 AM #8
    1slo4.8's Avatar
    1slo4.8
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    cut them off. throw them out your window while drivin down the highway at 80mph lol and tune it.
    2009 CHEVROLET 1500 with a MONSTER 4.8 between the frame rails!!

    Tuned by LSX Powersports ~ 4.10 ~ JBA Shorties ~ 4" Inlet/Outlet Spintech ~ Airaid Coldair
    CST 3.5" Spindles ~ Camburg Upper Control Arms ~ 2.5" CCM ~ FFR Tie Rods
    Full Throttle Suspension 3" Lift Blocks ~ Soft 8s wrapped in LT285/70/17 Silent Armors
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  9. 11-09-2007 12:37 PM #9
    txarkitekt's Avatar
    txarkitekt
    txarkitekt is offline Resident Smart Ass™
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    Yeah, if you are going to have the rear O2 sensors turned off, there is no reason to have the cats on... But it will not hurt anything to leave them in... IMO, I would take the cats and rear O2's out totally...

    2000 ECSB 6.0L
    TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
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  10. 11-09-2007 02:42 PM #10
    dropt4by
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    Quote Originally Posted by small1town9kid View Post
    cut them off. throw them out your window while drivin down the highway at 80mph lol and tune it.
    at least turn them in for a core....
    2003 silverado z71 rcsb 5.3 4L60E k&n intake system, gibson super truck exhaust, pcmforless tune, custom alpine stereo, hellwig sway bars fromt and rear, 3in drop in the front 4 in out back, powerslots f & r hawk pads. truck was intended to autocross, tow and bring the trophies home......
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