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Thread: code P0420 '05 Ram Daytona

  1. #1
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    code P0420 '05 Ram Daytona

    I have officially decided that fuel containing up to 10% ETHANOL is causing the P0420 trouble code (a catalyst efficiency problem) and of course turning the CEL light on in my '05 Ram Daytona! The CEL will turn off by itself and will remain off when I put fuel in saying it contains NO ETHANOL. HMMMM!

  2. #2
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    Re: code P0420 '05 Ram Daytona

    Are those trucks "Flex Fuel" rated?

  3. #3
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    Re: code P0420 '05 Ram Daytona

    NO he's talking about the 10% Ethanol blend a lot of gas stations have now not E-85.
    Brad Pennington-Proud SDAC Member 1987 Dodge Shelby Charger 1988 Chrysler Lebaron Premium Turbo Convertible 1990 Dodge Shadow VNT Competition 1 of 30

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    Re: code P0420 '05 Ram Daytona

    Ethanol is another one of those great ideas with many unintended consequences. I avoid it as much as possible.

  5. #5
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    Re: code P0420 '05 Ram Daytona

    Quote Originally Posted by bradp View Post
    NO he's talking about the 10% Ethanol blend a lot of gas stations have now not E-85.
    I understand that. The reason I asked is that the emissions equipment on non-flex vehicles might be sensative enough to do exactly what he's experiencing.

    If this is the case, then I'd be going back to the dealership to see if there's a fix.

  6. #6
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: code P0420 '05 Ram Daytona

    How many miles on the truck? It could be the cat is worn out on the lower end of the scale and the 10% Ethanol blend is enough to stop it working.

    Agreed on checking with the dealer, they could have a computer update for it.
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  7. #7
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    Re: code P0420 '05 Ram Daytona

    Quote Originally Posted by turbovanman View Post
    How many miles on the truck? It could be the cat is worn out on the lower end of the scale and the 10% Ethanol blend is enough to stop it working.

    Agreed on checking with the dealer, they could have a computer update for it.

    Only 66K! The cat(s) could actually be bad I guess. I'll have to look into it.

  8. #8
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: code P0420 '05 Ram Daytona

    Quote Originally Posted by glhs875 View Post
    Only 66K! The cat(s) could actually be bad I guess. I'll have to look into it.
    Well the code should tell you which cat if you have 2. 66k miles, it/they should still be good, unless you run it hard all the time.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  9. #9
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    Re: code P0420 '05 Ram Daytona

    Quote Originally Posted by turbovanman View Post
    Well the code should tell you which cat if you have 2. 66k miles, it/they should still be good, unless you run it hard all the time.



    I baby it!! I'm gonna change the O2 sensors first and see what happens.

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