Question about 2005 Nissan Pathfinder

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Have a 2005 Nissan Pathfinder that stops while I'm driving. I replaced the fuel pump last year, just got a new battery. Check engine light code is P0430. Some say its just a relay switch, others say its the catalytic converter. Please help, any advice will help.

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  • cr9880 Sep 22, 2010

    The wierd thing is that the truck will run great for maybe 2 weeks without turning off. Then any random day it will shut off again and when trying to turn on, it doesn't start right away. I took it to the mechanic last week and he hooked up the diagnostic computer to it and the car turned off by itself. He asked if I had shut it off and said no. He checked the diagnostic and he said that the catalytic converter would not shut the car off. He said it has to be something electrical. He also said the the computer is not reading what is wrong, that it keeps aborting it and he said that it's not normal. I have read some other blogs about it maybe being an issue with the IMPD computer. Please let me know your thoughts on this.


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A plugged catalytic converter would result in a lack of power. Usually very consistantly. A more likely option would be the ignition module or crankshaft position sensor but not absolute. Below are possible causes of the code P0430:
Air leaks at the exhaust manifold or in the exhaust pipes
Catalytic converter is damaged, contaminated or has failed
Front HO2S or rear HO2S is contaminated with fuel or moisture
Front HO2S and/or the rear HO2S is loose in the mounting hole
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
The failure of the cat is likely as a secondary failure, not as a cause. Look at items such as worn plugs which would result in insufficient ignition and excessive fuel being pumped into the cat to cause it's failure. In turn causing excessive heat which can cause electronics failures. One thing you can do, is run the vehicle for about 15-20 minutes at highway speeds and stop and look under the vehicle(while the engine is running) and see if the cat is glowing. If it is glowing, replace the cat and have the plugs looked at. How has the other maintenance been(filter, fluids, etc.)? One other thing that can be done is have a scanner hooked to the system and have the O2 sensors read as live data to determine the current function.

Posted on Aug 26, 2010

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