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." property="og:description">

For Shop Owners

P0420 HONDA - Catalyst System Efficiency Below Threshold Bank 1

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • 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)
What does this mean?

Tech notes

As the code description implies the 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.
What does this mean?

When is the code detected?

- 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)

P0420 HONDA Description

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.

OBDII Code P0420 Honda - Catalyst System Efficiency Below Threshold Bank 1 - k1no-portal.ru

P0420 HONDA Information for specific Honda models

Need more help?

Do you need more help with the P0420 Honda code? Ask a question to our users or find an automotive repair shop near you to help fix the OBDII code

P0420 HONDA Comments

Help us improve k1no-portal.ru. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0420 Honda code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

Browse All Codes For Specific Model YearBeta
Ford F150 1998 Ford F150
1999 Ford F150
2000 Ford F150
2001 Ford F150
2002 Ford F150
2003 Ford F150
Ford Fusion 2006 Ford Fusion
2007 Ford Fusion
2008 Ford Fusion
2009 Ford Fusion
2010 Ford Fusion
2011 Ford Fusion
2012 Ford Fusion
Honda Accord 2008 Honda Accord
2009 Honda Accord
2010 Honda Accord
Honda Civic 1996 Honda Civic
1997 Honda Civic
1998 Honda Civic
1999 Honda Civic
2000 Honda Civic
Infiniti G35 2003 Infiniti G35
2004 Infiniti G35
2005 Infiniti G35
2006 Infiniti G35
Nissan Altima 2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2006 Nissan Altima
2008 Nissan Altima
2009 Nissan Altima
2010 Nissan Altima
2011 Nissan Altima
2012 Nissan Altima
Nissan Maxima 2005 Nissan Maxima
2006 Nissan Maxima
2007 Nissan Maxima
2008 Nissan Maxima
Nissan Pathfinder 2005 Nissan Pathfinder
2006 Nissan Pathfinder
2007 Nissan Pathfinder
2008 Nissan Pathfinder
2009 Nissan Pathfinder
2010 Nissan Pathfinder
2011 Nissan Pathfinder
2012 Nissan Pathfinder
Nissan Rogue 2008 Nissan Rogue
2009 Nissan Rogue
2010 Nissan Rogue
2011 Nissan Rogue
2012 Nissan Rogue
2013 Nissan Rogue
Nissan Sentra 2002 Nissan Sentra
2003 Nissan Sentra
2004 Nissan Sentra
2005 Nissan Sentra
2006 Nissan Sentra
2007 Nissan Sentra
2008 Nissan Sentra
2009 Nissan Sentra
2010 Nissan Sentra
2011 Nissan Sentra
2012 Nissan Sentra
Toyota Camry 1997 Toyota Camry
1998 Toyota Camry
1999 Toyota Camry
2000 Toyota Camry
2001 Toyota Camry
2006 Toyota Camry
2007 Toyota Camry
2008 Toyota Camry
2009 Toyota Camry
2010 Toyota Camry
2011 Toyota Camry
Toyota Corolla 2005 Toyota Corolla
Toyota Echo 2000 Toyota Echo
2001 Toyota Echo
2002 Toyota Echo
Toyota Highlander 2001 Toyota Highlander
2002 Toyota Highlander
2003 Toyota Highlander
2004 Toyota Highlander
2005 Toyota Highlander
2006 Toyota Highlander
2007 Toyota Highlander
Toyota Prius 2004 Toyota Prius
2005 Toyota Prius
2006 Toyota Prius
2007 Toyota Prius
2008 Toyota Prius
2009 Toyota Prius
Scion xB 2005 Scion xB
2006 Scion xB
2007 Scion xB
Advertisement
Home - For Shop Owners - About k1no-portal.ru - Privacy Policy - Terms and Conditions - - Copyright 2010-2018 k1no-portal.ru
k1no-portal.ru - - - -
Posted and Edit by 01-14-2016

Related pages


po720 codehow to fix lean fuel mixturerandom misfire detected p03002005 jetta 1.8 t problems2007 saturn vue problemssteering significadododge obd2 codesmini cooper codes2001 honda accord check engine light resetmitsubishi diagnostic codescheck engine light code p0171throttle motor controlmazda protege 2000 enginetoyota trac off light1999 chevy suburban 5.7 vortec2003 lincoln ls catalytic converterwhat does ratch mean2001 chrysler town and country 3.8 enginepo3252004 dodge stratus check engine lightinlet temperature sensor2000 chevy venture enginenissan altima 2013 engine1999 honda civic supercharger1997 honda accord automatic transmission problems2003 silverado enginep0190 fuel rail pressure sensor circuit malfunctionobd code p0442po420 codewhat causes a camshaft sensor to go badchevy cobalt ignitionvw cc engine light2005 nissan maxima common problems2004 infinity i35air induction pump bypass module2002 honda civic ex problemsnissan tiida 1.8 fuel consumption2003 lexus rx3302002 gmc sonoma problemspo507 engine code2005 kia sorento timing belt replacementp0340 ford escort2001 chevy silverado service engine soon lightp0420 fix2004 dodge stratus transmissionnissan p03042000 dodge durango alternator2002 cadillac deville overheating2004 saturn vue transmission problemsvapor canister purge solenoid problemshyundai elantra oxygen sensorinfiniti i35 enginefuel pump 2006 nissan altima2005 saturn aura09 saturn outlookoxygen sensor heater bank 1 sensor 1p0113actron p04202006 bmw 325i thermostat replacementnissan altima distributoro2 sensor voltage highp2252engine code p1135chevy sonic check engine light2008 toyota prius check engine light2001 mercury sable transmission problems2003 corolla transmission problemsf150 coil packspo7432004 toyota rav4 engine5.9 magnum camengine code p0303what does vtech stand for2004 cadillac dtshow does camshaft position sensor work