Question about 2005 Nissan Xterra

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2005 nissan xterra -replaced the IPDM then had a check engine light that coded out to be catalytic converter. Have replace 3 of the 4 converters & the O2 sensors. After about 20 miles light comes back on. Nissan says it is the after market converters. After replacing the replaced converters the original replacements appear to be decaying like the original as if extra fuel is getting burned up in the converter. Any help?

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  • vince219 Feb 08, 2010

    The converters are rebuilt Nissan originals & the 02's are bosh

  • vince219 Feb 10, 2010

    plugs look good, leaning toward OEM 02's

  • vince219 Feb 11, 2010

    We replaced the replaced converter & light is off & coding correctly. need to give it 3 or 4 cycles to see what happens. Thanks

  • vince219 Feb 11, 2010

    We replaced the replaced converter & light is off & coding correctly. need to give it 3 or 4 cycles to see what happens.

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I don't believe this is caused by an aftermarket converter, I mean that I have yet to see any vehicle have the same problem while replacing the original converter with an aftermarket converter. I don't have a solution at this time due to more info needed by myself and other experts, but I do have a few questions; How many miles are on the vehicle? How does the engine perform when cold and at operating temperature?? Was there any other work done to this vehicle before your problem occured??? Why were the cats replaced to begin with....engine codes?, If any codes are known,please state what they were. Thanks.

Posted on Feb 11, 2010

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Reset and try again if it comes back check your conections

Posted on Feb 10, 2010

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If its running to rich pull your plugs out if there full of black film then u need to check more into the mass air flow sensor.

Posted on Feb 09, 2010

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Are you using OEM parts? The 02 sensors and the converter both need to be original replacments. These vehicles are touch when it comes to those two things.

Posted on Feb 08, 2010

  • Nate Stansfield
    Nate Stansfield Feb 09, 2010

    Those bosh sensors will likely dump a little more fuel then OEM. The 02 sensors send a pulse to computer telling the computer how much fuel to dump into engine and level out lean/rich mixture. After markets seem to run rich. You can try upgrading to a hotter spark plug to see if it burns the fuel better and save on the catalytic. Or go with high-flow catlytic and ignore the engine light.

  • Nate Stansfield
    Nate Stansfield Feb 11, 2010

    Sounds good. I would do the same. Should fix the problem.

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