Question about 2000 Nissan Maxima
"DTC P0420, P0430 THREE WAY CATALYST FUNCTION"
This code can be logged if a bad quality fuel,
the nissan daignosis procedure goes...
1. check the exhaust system for leaks, damage etc. this will give the sensor a bad reading
2. check for intake air leak, would be a hissing sound between air flow meter and engine throttle, maybe a loose hose, the intake tube can come loose in the middle.
3. check ignition timing, this should not change, if it did there would be more codes than this. bad quality fuel can also cause incorrect timing
4. check spark plugs, are due to be replaced at every 100,000km.
after that there is a lot of wiring tests, one of these 4 things would be most likley. reccommend try fuel from a different station first.
hope this helps
Posted on Jul 04, 2009
Code P00430 - catalyst system efficiency below threshold (bank #2). With scan tool get reading from o2 sensor if good voltage reading, bad catalyst has small restiction replace.
Posted on Dec 03, 2009
Check the resistance, with an ohm meter set on x10 scale, from body to engine then negative terminal on battery to body. It should read zero ohms. if not run ground straps from engine to body and from negative post of battery to body. Make sure all connection points are clean metal. If this does not help then these two codes are the real deal and the cat. assembly needs to be replaced. I found very good prices at Eastern Center Catalytic. Free shipping, out the door for $306.76. Either do it yourself or find a friend to replace it. Taking it to someone cost many $$$. However I have run into several Maximas with high resistance. Tying these points together may solve a variety of faults.
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
Posted on Dec 03, 2009
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Posted on Jan 02, 2017
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