Question about 2001 Jeep Grand Cherokee

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I have a 2001 jeep grand cherokee withe the 4.7 l v8 and im getting a code that reads main catalys bellow threshold upstream bank 2 it idles ok except rpm needle bounces a little

Posted by jesse135 on

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  • jesse135 Jan 26, 2011

    The code is p 0432 and it has recently started dying when i stop at a stop sign only when the motor hasent warmed up yet

  • jesse135 Jan 26, 2011

    Oh and another thing when im cold starting it i have to hold the key for for atleast 7 to 10 seconds before it will studer to a start would this code be causeing my problem i used to have a 4th cylinder misfire fuel injector was stuc wide open

  • jesse135 Jan 26, 2011

    1 last thing it also has this like hissin or something like air escapeing. Like an air hose on an air compreser. When im driveing it when its cold and been sitting for a few hrs it gets louder the higher the rpms but stops after a short time



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Steve Jensen

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Your catalytic converter is not doing it's job efficiently enough and it is setting off your sensor. This problem is emissions problem and usually has no effect on the operation of your vehicle( unless the converter clogs) As long as you don't live somewhere they do emissions test you don't really have to worry about it. However if you want to fix it you can take converter off and run a straight pipe or to do it "right" you could go pay way to much to get a new converter put on.

Posted on Jan 26, 2011

  • Steve Jensen
    Steve Jensen Jan 26, 2011

    Yes those could be a sign of a bad cat. Honestly I would cut it off and run a straight pipe. If you have enough know how to do it yourself. That way it doesnt cost u a thing and it prevents any problems from happening with it. I always take off my cat, they only cause problems. I would have to say with that code and those symptoms it is probably your cat. It may just be getting to the point where it's almost clogged, so its starting to run worse. You could just take it in and get it checked if you don't want to run a straight pipe. A shop won't do straight pipe because your "supposed" to have a cat.

  • Steve Jensen
    Steve Jensen Jan 26, 2011

    where is the hissing coming from? ur upstream nank 2 sensor is b4 ur cat then u have 1 after ur cat that is downstream. the downstream sensor reads the ecxhaust after it comes out of the cat and sends info to the upstream sensor on what the best mixture of gas




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Have an 2000 grand cherokee limited 4.7 engine need to know what part # is it for PO432 thank you tony

Posted on May 10, 2019


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