Nissan P0420 : Catalyst System Efficiency Below Threshold Bank 1

– Three way catalyst converter Bank 1
– Exhaust tube
– Intake air leaks
– Fuel injectors may be faulty
– Fuel injector leaks
– Spark plugs may be faulty
– Improper ignition timing
– Engine Control Module (ECM)

As the Nissan P0420 code description implies the Nissan P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

The OBD-ii Code Information Be Applicable For:

2013 Nissan Sentra
2013 Nissan Resonance Concept
2013 Nissan Pathfinder
2013 Nissan Murano
2013 Nissan Juke Nismo
2013 Nissan GT-R
2013 Nissan Friend-ME Concept
2013 Nissan Altima Sedan
2013 Nissan Almera
2013 Nissan 370Z
2012 Nissan e-NV200 Concept
2012 Nissan Versa Sedan
2012 Nissan Tiida
2012 Nissan TeRRA Concept
2012 Nissan Sylphy Concept
2012 Nissan Sunny
2012 Nissan Qashqai
2012 Nissan Pathfinder Concept
2012 Nissan Murano
2012 Nissan Micra ELLE
2012 Nissan Micra DIG-S
2012 Nissan Maxima
2012 Nissan Juke Shiro
2012 Nissan Juke Nismo Dark Knight Rises
2012 Nissan Juke Nismo Concept
2012 Nissan Juke Ministry of Sound
2012 Nissan Invitation Concept
2012 Nissan Hi-Cross Concept
2012 Nissan GT-R Track Pack
2012 Nissan GT-R
2012 Nissan Extrem Concept
2011 Nissan X-Trail
2011 Nissan Rogue
2011 Nissan Quest
2011 Nissan Pivo 3 Concept
2011 Nissan Patrol
2011 Nissan Murano CrossCabriolet
2011 Nissan Murano
2011 Nissan Micra
2011 Nissan Leaf Nismo RC Concept
2011 Nissan LEAF
2011 Nissan Juke Nismo Concept
2011 Nissan Juke-R Concept
2011 Nissan Juke
2011 Nissan GT-R Egoist
2011 Nissan GT-R
2011 Nissan Esflow Concept
2011 Nissan 370Z Roadster
2011 Nissan 370Z GT Edition
2011 Nissan 370Z
2010 Nissan Townpod Concept
2010 Nissan Qashqai+2
2010 Nissan Qashqai
2010 Nissan Pathfinder
2010 Nissan Navara
2010 Nissan NV200
2010 Nissan GT-R SpecV
2010 Nissan Ellure Concept
2010 Nissan Cube
2010 Nissan Altima Sedan
2010 Nissan Altima Coupe
2010 Nissan 370Z Roadster
2010 Nissan 370Z Black Edition
2009 Nissan Xterra
2009 Nissan Qazana Concept
2009 Nissan Qashqai+2
2009 Nissan Pixo
2009 Nissan Note
2009 Nissan Murano
2009 Nissan Maxima
2009 Nissan Land Glider Concept
2009 Nissan Frontier
2009 Nissan 370Z
2008 Nissan X-Trail
2008 Nissan Rogue
2008 Nissan Pathfinder
2008 Nissan Nuvu Concept
2008 Nissan NV2500 Concept
2008 Nissan GT-R GT500 Race car
2008 Nissan GT-R
2008 Nissan Forum Concept
2008 Nissan Denki Cube Concept
2008 Nissan Altima Coupe
2007 Nissan Versa Sedan
2007 Nissan Versa Hatchback
2007 Nissan Sentra SE-R
2007 Nissan Round Box Concept
2007 Nissan Qashqai
2007 Nissan Pivo 2 Concept
2007 Nissan NV200 Concept
2007 Nissan Mixim Concept
2007 Nissan Micra Colour Plus
2007 Nissan Intima Concept
2007 Nissan Bevel Concept
2007 Nissan Altima Hybrid
2007 Nissan Altima
2006 Nissan Urge Concept
2006 Nissan Terranaut Concept
2006 Nissan Note
2006 Nissan 350Z
2005 Nissan Zaroot Concept
2005 Nissan Xterra
2005 Nissan Terrano
2005 Nissan Sport Concept
2005 Nissan Primera
2005 Nissan Pivo Concept
2005 Nissan Pickup
2005 Nissan Patrol
2005 Nissan Pathfinder EUR

– Three way catalytic converter Bank 1 does not operate properly.
– Three way catalyst converter Bank 1 does not have enough oxygen storage capacity.

Possible symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).

A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.