Question about Nissan Maxima

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My check engine light is on with the code p0420. I have a 2005 nissan maxiam with over 110,000. It has came on and went off after a couple of days 3 or 4 times in the past year and a half but this time it has been on for over a week. Already check the gass cap b/c that what i orignaily thought the problem was. But we can not tell any diffrence in driving.

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CODE PO420 CATALYST EFFICIENCY BELOW NORMAL BANK 1. POSSIBLE CAUSES. THREE WAY CATALYTIC MANIFOLD. EXHAUST TUBE.INTAKE AIR LEAKS.FUEL INJECTOR.FUEL INJECTOR LEAKS.SPARK PLUG.IMPROPER IGNITION TIMING.

Posted on May 20, 2011

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There are several possible causes.

  • Clogged fuel injectors
  • Fouled spark plugs
  • Timing belt problems (if original timing belt, it should be replaced to avoid more serious problems)
  • Intake air leak

Posted on May 20, 2011

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