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Error Code P0420 Honda Accord

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Repair Difficulty Level:2/3 | Add Comment http://www.autocodes.com/p0420_honda.html Forum Code Possible causes - Three way catalyst converter Bank 1- Exhaust tube- Intake air leaks- Fuel injectors what does a p0420 code mean may be faulty- Fuel injector leaks- Spark plugs may be faulty- Improper ignition timing- Engine

Code P0420 Honda Accord 2003

Control Module (ECM) What does this mean? Tech notes As the code description implies the P0420 code means that the

P0420 Honda Accord 2004

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

P0420 Honda Accord 2007

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 accord 1999 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. P0420 Honda Information for specific Honda models P0420 1996 HONDA CIVIC P0420 1997 HONDA CIVIC P0420 1998 HONDA CIVIC P0420 1999 HONDA CIVIC P0420 2000 HONDA CIVIC 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 Ask a Question Find a Shop Related Information Help AutoCodes.com Help us improve AutoCodes.com. 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 Please enable JavaScript to view the AutoCodes.com Powered by Dis

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- p0420 honda accord 1997 Improper ignition timing- Engine Control Module (ECM) What does this mean? Tech p0420 honda accord 2003 v6 notes As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic p0420 honda accord 1998 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 http://www.autocodes.com/p0420_honda.html 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 http://www.engine-codes.com/p0420_honda.html 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. P0420 Honda Information for specific Honda models P0420 1996 HONDA CIVIC P0420 1997 HONDA CIVIC P0420 1998 HONDA CIVIC P0420 1999 HONDA CIVIC P0420 2000 HONDA CIVIC Related Information Repair Importance Level: 2 1=Low 2=Medium 3=High Repair Difficulty Level: 2 1=Easy 2=Moderate 3=Hard AutoCodes.comFREE Android App Search Codes By Make Acura Audi BMW Buick Cadillac Chevrolet Chrysler Dodge Eagle Ford GEO GMC Honda Hummer Hyundai Infiniti Isuzu Jaguar Jeep KIA Land Rover Lexus Lincoln Mazda Mercedes-Benz Mercury MINI Mitsubishi Nissan Oldsmobile Pontiac Saab Saturn Scion Subaru Suzuki Toyota Volkswagen Volvo Browse All Codes For Specific Model YearBeta Ford F150 1998 Ford F150 1999 Ford F150 2000 Ford F150 2001 Ford F150 2002 Ford F150 200

that specific trouble code. If your car's check engine light is on, get that code read in case it's a P0420. A P0420 code is a trouble code http://www.p0420.com/ on OBD-II equipped vehicles. All vehicles from 1996-newer sold in North America support this generic powertrain code. This code is a pretty common one and this site is here to help the average do-it-yourself (DIY) car owner (like you) troubleshoot, diagnose, and fix their vehicle themselves when presented with a P0420 code, saving money. If your car has multiple trouble codes (DTC's), it's always a good idea p0420 honda to fix them in the order they come up on the code reader. For example, if you have these codes - P0300, P0420, P0171, then you're going to want to tackle the P0300 Random Misfire code first (resolve it), and then tackle the P0420 code, etc. The reason for that is that the first code could be causing further DTCs to be set. If you've come to this p0420 honda accord site you most likely already know that you have a P0420 code. To start, we strongly recommend you seek the services of a professional mechanic/technician if you have any doubts as to whether you can perform the repair! Also, be sure to follow proper diagnostic procedures to determine whether a part has failed. If you simply change parts hoping it will solve the problem, you're really just guessing and wasting money. This site is here for information purposes only and is meant to help you learn more about the dtc and decide if you can tackle the repair yourself. It is not intended as car repair advice. OK, so what does a P0420 code mean anyway? As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1). OK, now tell me that again in plain English please.... let's break it down: the catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient). Bank 1 refers to the side of the engine which contains cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is only one bank. So, to really simply

 

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