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Catalytic converter/check engine light

Discussion in 'Grand Cherokee, Durango, etc' started by Richard1, Aug 6, 2017.

  1. Richard1

    Richard1 Member

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    About 50 miles into a 2500 mile trip, out in the middle of nowhere, my check engine came on (2012 Grand Cherokee 4x4 3.6). After about 400 miles I got to a town with a dealer and they scanned it, showing me that at one point it had a catalytic con converter problem, but was no longer a problem. They reset the code.

    50 miles later, again in the middle of nowhere, the light came back on, but I had to continue my journey, mostly over 12000 ft above sea level.

    Is it an O2 sensor that triggers it? Is it possible that I got water in the connectors? (I frequently have to drive in 12 inch water to get to my house or out).
     
  2. ImperialCrown

    Level III Supporter

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    Converters run hot. A splash of water could have rapidly cooled it and stopped the catalyst action. O2 sensors also rely at being at a high temperature to operate and any rapid cooling will render them inactive until they warm up again.
    O2 sensor signals run at between 0 and 1 volt. It may be easy to short that out or pull down the voltage with wetness?
     
  3. LouJC

    LouJC Active Member

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    If you can post the specific code that can help to narrow it down. Some O2 sensor codes, are actually caused by other things. I had this with my 07 Hemi with a P013 code. This is a code for slow response of the upstream O2 sensor but it is actually caused by extra air in the exhaust due to an exhaust leak that can be found with a smoke machine. I wound up getting a new cat converter under the fed emissions warantee..a small crack was causing this code.

    On mine the pcm would do a self check of how fast the upstream O2 sensors switched lean/rich but only when driving over 60 for a set amount of time. Then it would set the code. During local low speed driving it would not set the code.
     

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