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#1
08-05-2011, 06:29 AM
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2001 RAM 5.2 P0420 error code
Autozone ran the codes on my CEL and found P0420. They gave me four possibilities of what it could mean but I would like to narrow it down a little more if I can.
1. Catalyst efficiency low-bank 1, possible cause, defective Catalytic converter 2. Engine misfire or running condition 3. Large vacuum leak 4. Engine oil leakage into exhaust valve guide These are four very different issues for this one code. How would I be able to narrow it down to the real cause? Thanks, -mark
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Mark "Sharky" Stover 73 Century Regal 455 05 Chrysler T&C 07 Dodge Ram SLT 11 GMC Yukon Denali XL 
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#2
08-05-2011, 12:03 PM
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Re: 2001 RAM 5.2 P0420 error code
Profile the <make> <model> <year> , and mileage.
How doe's she run? How's the mpg? The down stream H02 sensor told the ecu, that the catalytic converter isn't doing its job on bank1. A Test canbe done on your catalytic converter at any local muffler shop. For DIY, do a Google ''Youtube auto catalytic converter test''
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#4
08-06-2011, 11:07 PM
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Re: 2001 RAM 5.2 P0420 error code
P0420 1/1 Catalytic Converter Efficiency Catalyst.
1/1 efficiency below required level.
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1992 Bravada, 201K, stock 1997 Bravada, 101K, stock...was "called away"  "Cornbread Red", 2001 Dodge 2500,4X4,HO Cummins Diesel,QC,SWB,6spd.,Banks boost&pyro,US Gage fuel press.,Edge Drag Comp,4"exh.,cowl hood, bhaf, black Holley pump, 140gph...13psi WOT, Vulcan Big Line, kevlar/ceramic single disc clutch, cheapo fuel cooler, 8x.010" vco injector nozzles, Cat turbo 62-65-.70A/R, 497hp 1089 tq 8/25/14  Time to turn so's you don't burn. 
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#5
08-07-2011, 09:23 AM
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Re: 2001 RAM 5.2 P0420 error code
I agree it could be the upstream 02 sensor, had the same code on my 98 windstar watched the operation of 02 sensor and found it to be lazy, replaced with new sensor and have not had code since. (Put on 5,000 miles since and the vehicle has 200k on it)
good luck
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#6
08-08-2011, 10:29 AM
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Re: 2001 RAM 5.2 P0420 error code
Quote:
So is it most likely the upstream or the downstream sensor?
__________________
Mark "Sharky" Stover 73 Century Regal 455 05 Chrysler T&C 07 Dodge Ram SLT 11 GMC Yukon Denali XL
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#7
08-10-2011, 06:32 PM
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Re: 2001 RAM 5.2 P0420 error code
Hmmm, the CEL is no longer lit.
__________________
Mark "Sharky" Stover 73 Century Regal 455 05 Chrysler T&C 07 Dodge Ram SLT 11 GMC Yukon Denali XL
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| The Following User Says Thank You to sharkmonkey For This Useful Post: | ||
danielsatur (08-10-2011)
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#8
08-16-2011, 03:53 PM
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Re: 2001 RAM 5.2 P0420 error code
Get an OEM sensor, not some junk from advance auto or the like. A Bosch is the worst choice.
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98 Ram 1500 4x4 Flowmaster American Thunder W/super40
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