P0422 Error Code

Discussion in 'General Motoring' started by Scott, Jan 13, 2007.

  1. Scott

    Scott Guest

    Just got back from Advance Auto Parts... a free diagnostic check for
    the cause of the engine malfunction light turned up error code: P0422.
    After some research online it's suggested the problem is either the
    CCV- canister control valve, an oxygen sensor, or catalytic converter

    My questions are:
    1. I just had my coil pack replaced, along with spark plugs and an
    injector service. Could this have caused the problem?

    2. Should I take it back the the place that replaced the coil pack,
    replace the sensor myself to see if that was it, or go to the dealer?

    Thanks. Oh, and what is this going to set me back?
    Scott, Jan 13, 2007
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  2. Scott

    hyundaitech Guest

    P0422 indicates your catalyst efficiency is low. If you had a misfire
    issue, I'd primarily suspect that the converter was damaged by driving
    vehicle while it was misfiring.

    The converter in question is the one between the front and rear oxygen

    If your car drove normally after repairs, this problem wouldn't have been
    detectable by the rapair facility until the check engine lamp eventually
    came on with the diagnostic trouble code. For that reason, it's doubtful
    you'll receive any assistance with repairs.

    If you're within the 8 year/80,000 mile warranty on the converter, you
    might try taking the car to the dealer. Of course, if they see new
    aftermarket wires, they'll probably figure out what happened.
    hyundaitech, Jan 17, 2007
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  3. Scott

    Scott Guest

    Took the car to the dealer. Dealer said it was a bad catalytic
    converter and they replaced it no charge because it was under the 80k
    miles. Now that I've driven the car 100 miles, the check engine light
    is back on. I'll be bringing the car back to the dealer for the next
    step. Still not sure what I'll do about the 1st shop that repaired
    the coil pack, if anything. I guess if the dealer discovers that to
    be the problem, I'll have to take it back to the 1st shop. I'll keep
    everyone posted.
    Scott, Feb 13, 2007
  4. Scott

    Scott Guest

    Dealer reports both the catalytic converter and pre-cat were bad. All
    covered under 8/80 warranty.
    Scott, Feb 14, 2007
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