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Catalist 420 code?

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Old 01-15-2009, 12:20 AM
caggi caggi is offline
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Question Catalist 420 code?

"MIL" (ck eng) light is on for a PO420 DTC? Do I need a new cat? I would appriciate anybody who could help. thanks
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Old 01-15-2009, 08:20 AM
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aim4squirrels aim4squirrels is offline
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P0420 is catalytic converter efficiency below minimum specs.

Probably time for a new cat, but have you changed anything else? it could also be a dirty O2 sensor. you can clean them with electric parts cleaner. you can also use carb/choke cleaner if you're careful
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Old 01-15-2009, 05:35 PM
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You could also fill in the specs about your truck when you register! And it's probably time for a new lower intake gasket.
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
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Old 01-15-2009, 06:02 PM
xskylinedx xskylinedx is offline
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Just remember if you do in fact need a new cat check out summitracing. I picked up a
hi flow stainless steel magnaflow cat for under $100.
01 Ext Cab 5.9 Off Road
Yeah, its modded
See 'My Garage' for details
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Old 01-15-2009, 06:49 PM
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420 Hmmmmmmmmmm ?? - Not enought THC in your system
1994 Ram, 4 x 4, 230K Miles, 5.2l, 46RH Dr Evil Tranny (Street Evil),
Custom 4.5 inch lift, Bilstein 5100 series shocks, 10000lbs winch, 35x12.5x15 BFG KM2
4.88 gears, Powertrax posi rear, open front
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Old 01-16-2009, 05:35 PM
caggi caggi is offline
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Default thanks for the replies

I'll try cleaning the sensor, how do I know if it's the sensor or the cat? Or the intake gasket? I haven't done anything yet, just some banging on the muffler and it's loose inside. The cat might be too haven't hammered on that yet.
(I try to get more THC in, maybe I'll forget about that durned light! )
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