Question about 2005 Hyundai Tucson

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P0420 & P0430

My car is jerking and struggling from 0-40 sometimes. It is a hit or miss with this issue but it is getting to me more and more frequently. I am not sure which it would be cat system or just the o2 sensors

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  • Robert Summers Mar 23, 2014

    What s the mileage on the car? Sounds more like a fuel problem, maybe plugged fuel filter

  • Alan Mar 23, 2014

    another thing might be dirty or partly blocked injectors, or filters might need changing.

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  • Hyundai Master
  • 78,289 Answers

It is not an O2 sensor issue.

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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SOURCE: 2001 elantra replaced cat o2 sensor upstream and

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

jcampo1000
  • 166 Answers

SOURCE: what can cause a 2005

i would check ur fuses that supply voltage to ur o2 sensors, their in the fuse box and usually r labeled o2 sensr. sounds like the o2 sensrs dont have power

Posted on Apr 09, 2011

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