P0420 Catalyst System Low Efficiency ???? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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25HEMI00
 
  P0420 Catalyst System Low Efficiency ???? - Posted: 12-14-2009, 09:32 AM
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Post #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?
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2003 Hemi Ram 2500 Sold
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1999 Ram 2500 v8 Reg Cab<<<<Rescued from Auction Lot!
Completely put her back together and installed:
7'6 Western plow<< redesigned 1500 carriage and made brackets for 2500
hughes plenum repair+93 octane=no more ping
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otnielarencibia
 
 Posted: 12-14-2009, 10:13 AM
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Post #2

......most likely. It'll throw it if you have no cats as well.
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2004 Dodge Ram Hemi Sport (flame red)

Inertia built forged hemi, 6.1l crank, Manley flat top pistons 9:5:1 compression, K1 rods, ARP main bolts and head studs, 6.1l springs and retainers, 6.1l push rods, 6.1l oil pump, Inertia custom turbo cam, Custom 24x12x4 front mount intercooler, sts turbo, T76 Turbonetics Q trim 76mm, sts electric boost controller, Diablosport tuned, custom billet fuel rails, 255lph Holley fuel pump, XRP racing fuel fittings and hoses, SRT-4 map sensor, 80# Siemens racing injectors, MSD spark plug wires, NGK 4306 spark plugs, Autometer boost gauge, Autometer egt gauge, Aeroforce scan gauge, PLX device DM-100 Air/Fuel wideband, Tick Performance stage 2 t56 6 speed, ARP flywheel and pressure plate bolts, JMB Performance viper clutch hydraulics, Quick Time bell housing, kevlar clutch, B&M shifter, srt10 front brakes, srt10 dana 60 rear axle 4.56 gears, Eibach 2/4 drop, Eibach pro damper shocks, Belltech rear sway bar, mark vii efan, 180 degree MotoRad thermostat, 15% UD ATI Damper, smaller ALT pulley, Flowmaster y-pipe, Magnaflow straight though muffler, Tekonsha Prodigy P3 brake controller, Kenwood HU and component speakers, MTX amp and subs.........
That Hemi 6 speed AND got a turbo?!?!
My truck whistles club!!! member #2
480rwhp/522 lbs. rwtq at 7 lbs of boost

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25HEMI00
 
 Posted: 12-14-2009, 11:53 AM
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Post #3

is there anything i can do or am living with a check engine light?
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2003 Hemi Ram 2500 Sold
Current:
1999 Ram 2500 v8 Reg Cab<<<<Rescued from Auction Lot!
Completely put her back together and installed:
7'6 Western plow<< redesigned 1500 carriage and made brackets for 2500
hughes plenum repair+93 octane=no more ping
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TheSatinPumpkin
 
 Posted: 12-14-2009, 01:29 PM
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Post #4

You can try the non fouler method. Few detailed threads about it. Lots of people have been succesful.
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eaton
 
 Posted: 12-14-2009, 08:04 PM
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Post #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.
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Chrome Tubular Upper Grill - Polished Billet Bumper Grill - Polished Billet Fuel Door - 10" Black Shorty Antenna - Silver Antenna Bezel - Black Painted "B" Pillars - 22x9.5" Chrome Liquid Metal Lithium 5 wheels - 305/40-22 Nitto NT420s Tires - Belltech 2/5 Drop with Street Performance Shocks (#810SP) - Retrofit Morimoto Mini D2S 2.0 Headlight Projectors - Gatling Gun Shrouds - D2S 6000k HID Bulbs - AMP bulb adaptors - Color-Matched Headlight Bezels - Smoked Turn Signal Reflectors - Chrome Turn Signal Stealth Bulbs - 9006 HID Foglights 6000k - Smoked LED 3rd Brake Light - Smoked LED Tail Lights - 6k LED reverse Lights (3157) - LINE-X Bedliner - Street Scene Gen 2 Steel Roll Pan - Mopar Rear Wheel Well Liners
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Factory Infinity System...Gone, Finally! - Kenwood KDC-MP2035 Head Unit - Kenwood iPhone Interface - Peripheral CHYAH05 CANbus Interface (No More DTC's) - Infinity Reference 6-1/2" Components (2 Pair) - Infinity Kappa Perfect 10.1 Subwoofers (2) - Profile AP1040 80x4 RMS - Profile AP2000 320x2 RMS - Tsunami 2-Farad Capacitor - SteetWires Wiring w/ 200-Amp Main Fuse - Custom Fiberglass Subwoofer Enclosure - 100 sq./ft. FatMat - Billet Technology Satin HVAC Knobs - Billet Technology Satin Headlight Knob - Polished Billet Ribbed Cigarette Lighter - Chrome HVAC Vent Covers - Window Tint (35% Front Doors / 5% Windshield Strip, Rear Doors, & Rear window) - Silver Center Dash Bezel - Silver Door Panel Spears - Silver Front Door Window Switch Bezels - Silver Rear Window Switch Bezels - Silver Steering Wheel Bezels - Silver Overhead Console Bezel - Silver Dome Light Bezel - Silver Door Lock Bezels - Smoked Door Reflectors

Performance:
AirAid MIT - K&N Drop-in Filter - Superchips Flashpaq (#3865) w/ Trans Tuning - BBK Headers (#4009) - Mopar Header Gaskets - 2.5" Custom Tubing from Cats to Magnaflow Y - Magnaflow Y-Pipe 2.5" DI/3" SO (#10778) - Magnaflow 6" Round Muffler 3" SI/SO (#12619) - Jet 180* Thermostat (#10183) - Motive 4.56 Gears LSD - PowerStop Cross-Drilled/Slotted Rotors F/R & Powerstop Evolution Z16 Ceramic Pads F/R (#2164) - Black Painted Calipers/Brackets

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FAhemiST
 
 Posted: 12-14-2009, 08:11 PM
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Post #6

your pcm thinks your cat is bad because it was replaced with a hi flow. you can try the steel wool trick or i used o2 sims which pull the o2 sensor out of the exhaust stream a little. you can find them here http://moesperformance.com/index.php...8924c60d64dfd1
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otnielarencibia
 
 Posted: 12-14-2009, 10:23 PM
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Post #7

http://www.dodgetalk.com/forums/showthread.php?t=270306
Didn't work for me.
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2004 Dodge Ram Hemi Sport (flame red)

Inertia built forged hemi, 6.1l crank, Manley flat top pistons 9:5:1 compression, K1 rods, ARP main bolts and head studs, 6.1l springs and retainers, 6.1l push rods, 6.1l oil pump, Inertia custom turbo cam, Custom 24x12x4 front mount intercooler, sts turbo, T76 Turbonetics Q trim 76mm, sts electric boost controller, Diablosport tuned, custom billet fuel rails, 255lph Holley fuel pump, XRP racing fuel fittings and hoses, SRT-4 map sensor, 80# Siemens racing injectors, MSD spark plug wires, NGK 4306 spark plugs, Autometer boost gauge, Autometer egt gauge, Aeroforce scan gauge, PLX device DM-100 Air/Fuel wideband, Tick Performance stage 2 t56 6 speed, ARP flywheel and pressure plate bolts, JMB Performance viper clutch hydraulics, Quick Time bell housing, kevlar clutch, B&M shifter, srt10 front brakes, srt10 dana 60 rear axle 4.56 gears, Eibach 2/4 drop, Eibach pro damper shocks, Belltech rear sway bar, mark vii efan, 180 degree MotoRad thermostat, 15% UD ATI Damper, smaller ALT pulley, Flowmaster y-pipe, Magnaflow straight though muffler, Tekonsha Prodigy P3 brake controller, Kenwood HU and component speakers, MTX amp and subs.........
That Hemi 6 speed AND got a turbo?!?!
My truck whistles club!!! member #2
480rwhp/522 lbs. rwtq at 7 lbs of boost

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compressor man
 
 Posted: 12-15-2009, 06:31 AM
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Post #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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