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Old 08-28-2013, 05:21 PM   #1
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P0431

Hey guys got rid of the p0032 or 31 code for front upper o2. Now 0431 is popped up. I know for a fact I don't have misfire, or oil seeping into the exhaust manifold. Only thing left is bad upper cats, bad o2, exhaust leak or vacuum leak. I don't believe I have an exhaust leak no sounds of one. Vacuum leak have no idea how to check so any hints on vacuum or exhaust leaks please full me in. I'm having a pressure test done on the cats this Friday to see if cats are bad. I flashed the pcm and it's been two days no code but I know it's coming back I mean it's a jeep ha. Also 106000 miles 05 LJ.

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Old 08-28-2013, 05:52 PM   #2
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mine had that code and the cat was failed. all the guts from the cat splintered apart and went past the downstream o2 sensor. Im an automotive tech myself, so i watched all the o2 sensors operating on the shop scanner on graph mode and could see the cat not cleaning the exhaust. The front and rear o2 sensors will be reading the same. That gives away that you have an issue.

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Old 08-28-2013, 06:00 PM   #3
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Ok ill have to find someone with a good scanner. Seeing as my mechanic moved.
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