Question about 1997 Nissan Pathfinder
I was told by the previous owner that the Cat. was replaced 1 year ago...Help!! LOL
Trouble Code: P0420 Catalyst Efficiency Below Normal (Bank 1) Possible Causes:
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).
Catalyst Efficiency Below Normal (Bank 1)
Posted on Dec 30, 2012
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Posted on Jan 02, 2017
SOURCE: 01 nissan pathfinder
The mass airflow can get dirty and you will get trouble codes for everything under the hood except for the mass airflow. Try unplugging your mass airflow and driving the vehicle, if your problem goes away you need to clean the sensor. Buy some mass airflow cleaner though because other cleaners can damage the coating on the sensor.
Posted on Feb 26, 2009
before changing a rather expensive catalytic converter i would first make sure that the o2 sensor is working correctly, as this sensor will say the cat is bad when it is the sensor it self that has become faulty. there are 4 sensors 2 before the catalytic converters and 2 after the cats, if these become dirty or faulty they will give you that same code.
in any case bank one is usually the right side of the engine and would be the first cat in the system.
Posted on Dec 22, 2010
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