Question about 2005 Nissan Altima

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2005 Nissan Altima service engine light came on, Had a reading = P0420, #1 aa1 Large vacumm leak, #2 aa2 Fuel system fault, #3 aa3 Ignition system fault and #4 aa4 Failed Bank 1 catalytic converter. Any ideas?

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One thing you can bet the house on ....if a nissan sets a cat converter needs a cat me on the last 10 yrs. as nissan master tech i have seen no other cause!

Posted on Mar 18, 2011

  • Dominguez Apr 02, 2012

    I have the same problem as above...P0420. The cat conv runs about 420..00 plus the exhaust gasket ($15.00 ) and the bearing seal ($15.00), all are dealer prices.

    Do I have to change the oxygen sensors? I heard it has two, one on the cat conv and the other should be the outer sensor. Is this something that I can do without paying a dealer price?


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