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  1. #1
    Active Member Two Rings ch229151's Avatar
    Join Date
    Jun 25 2007
    AZ Member #
    19051
    My Garage
    B6 A4 3.0 quattro
    Location
    Long Island, NY

    Stupid Codes..02 sensors?

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    Hey guys,

    Just pulled a couple of codes from my 3.0 A4...

    P 421
    p 431

    I assume since they both read the same error this has to be my post and pre O2 sensors? Is it easy to change them myself? Just wanted to check with the general concensus to see if this what it means before i go and order these things online....Thanks.

    PS- I am getting crappy gas mileage.

  2. #2
    Veteran Member Three Rings FourRings80's Avatar
    Join Date
    Jan 07 2008
    AZ Member #
    23932
    My Garage
    04 A4 1.8tqm
    Location
    Montreal, Canada

    Re: Stupid Codes..02 sensors?

    Did you get the oxygen sensors resistance.....should be 2.5~10 ohms

    Cats are covered under warranty right? (8years/80000miles)
    Last edited by FourRings80; 04-09-2008 at 03:33 PM.
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