Question about 2001 Hyundai Elantra

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2001 elantra replaced cat o2 sensor upstream and

Already replaced cat converter replaced speed sensor and o2 sensor upstream and downstream but still getting po422 code.and recently a n/a ooo code.Now its starting to stall when i come to a stop and also when accelerating it cuts off for a sec sometimes

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In reading what you've already done, I would suggest a Compression Test along with a vacuum gauge hooked up to the intake manifold. It may be that you're burning oil through your exhaust system in the catalytic converter. I've seen this with leaking or inoperative turbo-chargers. Pull all of your spark plugs, marking them as to what cylinder they went in with a Sharpie and if worn, replace them. Check the distributor cap & rotor button for wear or cross-firing. A Haynes Manual for your vehicle is available through most part stores which is truly effective for your DIYer. Bad plug wires can send unburned gases down through both O2 Sensors and the Catalyst. You may also want to check the plug wires and the coil(s). A fast way of checking plug wires is to grab all of them with your hand with the vehicle running and if you get "zapped"...you need spark plug wires. Remember, the codes you pull are just a general starting point as to where to start your diagnostics, not the exact problem itself. The computer doesn't monitor the mechanical aspect of your engine nor the fuel supply. The computer will take this as a given, so don't forget that when testing that it could be a compression problem or fuel problem, but as I first said...an oil leak fouling your exhaust system such as an inoperative EGR valve or oil leak on the exhaust side of the valve train.

I hope this Helps,

"00 Buck"

Posted on Jul 18, 2010

  • Anthony  Atme
    Anthony Atme Jul 18, 2010

    Thanks 00 buck for the time and advise, i replaced the wires n plugs not to long ago..I dont think there's a leak im overdue for an oil change and the oil level hasnt decreased at all...im gona look into vacuum componet of the whole fuel system system thanks again

  • Mark Lewis
    Mark Lewis Jul 18, 2010

    Thank you Sir. Another "old School" trick is to hold a Dollar Bill at the Exhaust pipe while it's idling. If the Dollar Bill gets "sucked" up toward the tailpipe on a somewhat regular basis, then you have Engine Mechanical problems. That's what I've used for Years in looking at used cars, is the "Dollar Bill Trick."

    Thanks for your feedback,

    ~Buck Lewis~

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Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

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