P0422 - 2001 Elantra

Discussion in 'Hyundai Elantra / Lantra' started by Matthew Fedder, Oct 27, 2008.

  1. Hi Hyundaitech!

    You probably don't remember my unrealistic optimism that P0422 might
    only be an O2 sensor problem, from a post in June, which you helped
    bring to ground. (It still seems weird to me that the car would be
    diagnosing a bad cat so soon after getting perfect marks on a smog
    check).

    Well, if I am to bite the bullet, do I need to replace both Cats? In
    yet another display of optimism (do I never learn...), I'm hoping I
    can get away with replacing only the exhaust manifold+cat for a mere
    $161, and not the front pipe+cat, which runs $743. Yet my gut tells
    me that the more expensive one would be the more important one, and
    (unless I'm having a brain fart) they're both between the upstream and
    downstream o2 sensors.

    Thanks!
    -Matthew
     
    Matthew Fedder, Oct 27, 2008
    #1
  2. Matthew Fedder

    hyundaitech Guest

    Unless your car has a different setup than most I've seen-- that's possibl
    since different localities have different emissions setups-- you have on
    oxygen sensor in the manifold prior to the manifold converter and one i
    the front pipe behind the manifold converter and in front of the rea
    converter. I've seen no vehicles (of your vintage) with a sensor behin
    the rear converter.

    So, it'd be my assessment that you only need to replace the manifol
    assembly (which includes the front converter).

    Also, if you're the original owner, you may be able to get this covere
    under the powertrain warranty -- exhaust manifold is included.

    And, you may also have an open recall on the manifold which allows th
    dealer to replace it free of charge if it's cracked. (In my opinion, thi
    is the reason it's being sold so far below what most would consider
    reasonable market price. Dealers buy from Hyundai and sell back afte
    their allowed markup. Hyundai would like to minimize the markup expense.
     
    hyundaitech, Oct 27, 2008
    #2
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