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thompsb2 12-18-2013 06:00 PM

2002 GC 4.7 4x4 P0420 code
Have not posted in a while but my Jeep is showing a P0420 code and I am hoping for info. It is a 2002 with 210K on it. I bought it used so I do not know if the CAT's or O2 sensors have ever been replaced. I am thinking of getting the Y-pipe from Rock Auto with the Mini Cats. The Jeep is running well but seems to be a bit down on power, it is not missing or running rough at all. I was also thinking of running some SeaFoam in the fuel system with a full tank of fuel then trying to do a reset on the trouble code. Ideas\thoughts will be greatly appreciated. Should I replace the Cats and sensors or put it to pasture? Looking for repair advice from those who have been there and have the T-shirt.

Thanks in advance.


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