Honda Error Code P420
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(DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article
P0420 Honda Accord
applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, etc. The catalytic converter is a part p0420 honda civic of the exhaust system that looks kind of like a muffler, although it's job is very different from that of a muffler.
Po430 Code
A catalytic converter's job is to reduce emmissions from the exhaust. The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream p0420 bank 1 oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear p0420 honda odyssey out and need replacement. If they have failed, it is likely due to something else that caused it to fail. Symptoms The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle. Causes A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for A damaged or failed oxygen sensor (HO2S) Downstream oxygen sensor (HO2S) wiring damaged or connected improperly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination Possible Solutions Some suggested steps for troubleshooting a P0420 error code include: Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converte
Possible causes - Three way catalyst converter Bank 1- Exhaust tube- Intake air leaks- Fuel injectors may
P0420 Toyota
be faulty- Fuel injector leaks- Spark plugs may be faulty- Improper ignition p0420 fix timing- Engine Control Module (ECM) What does this mean? Tech notes As the code description implies the
P0420 Ford
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 https://www.obd-codes.com/p0420 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 http://www.engine-codes.com/p0420_honda.html 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. 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.com FREE Android App Search Codes By Make Acura Audi BMW Buick Cadillac Chevrolet Chry
Du siehst YouTube auf Deutsch. Du kannst diese Einstellung unten ändern. Learn more You're viewing YouTube in German. You https://www.youtube.com/watch?v=FCTEmWo7FEE can change this preference below. Schließen Ja, ich möchte sie behalten Rückgängig machen Schließen Dieses Video ist nicht verfügbar. WiedergabelisteWarteschlangeWiedergabelisteWarteschlange Alle entfernenBeenden Wird http://www.honda-acura.net/forums/accord/206101-p0420-code-again.html geladen... Wiedergabeliste Warteschlange __count__/__total__ Beating the P0420 Check Engine Code! jaykay18 AbonnierenAbonniertAbo beenden4.1474 Tsd. Wird geladen... Wird geladen... Wird verarbeitet... Hinzufügen Möchtest du p0420 honda dieses Video später noch einmal ansehen? Wenn du bei YouTube angemeldet bist, kannst du dieses Video zu einer Playlist hinzufügen. Anmelden Teilen Mehr Melden Möchtest du dieses Video melden? Melde dich an, um unangemessene Inhalte zu melden. Anmelden Transkript Statistik 212.333 Aufrufe 83 Dieses honda error code Video gefällt dir? Melde dich bei YouTube an, damit dein Feedback gezählt wird. Anmelden 84 169 Dieses Video gefällt dir nicht? Melde dich bei YouTube an, damit dein Feedback gezählt wird. Anmelden 170 Wird geladen... Wird geladen... Transkript Das interaktive Transkript konnte nicht geladen werden. Wird geladen... Wird geladen... Die Bewertungsfunktion ist nach Ausleihen des Videos verfügbar. Diese Funktion ist zurzeit nicht verfügbar. Bitte versuche es später erneut. Veröffentlicht am 16.11.2012Originally recorded October 26, 2012.Also seePart 2: http://www.youtube.com/watch?v=K40aLg...Part 3: http://www.youtube.com/watch?v=HL4K7C...It was time to get the car inspectorated. I've had a Check Engine Light on for quite some time now, P0420.You have a small window of opportunity to do this, and you will need an OBDII Scan Tool that will show you the readiness monitors and their status.If you have a P0420
1 of 2 12 Last Jump to page: Results 1 to 30 of 56 Thread: P0420 Code AGAIN!!! Thread Tools Show Printable Version Subscribe to this Thread… 09-21-05,10:27 AM #1 Vladi17 View Profile View Forum Posts Registered User Join Date Feb 2005 Posts 13 P0420 Code AGAIN!!! Okay, this is my least favorite number. This is my third time recieving this code within 9 months. The first time I replaced the o2 sensor before the monifold. I then got the same error three months after and replaced my other oxygen sensor along with the previous one. Therefore I have had two new o2 sensors in my car for the last 3 months. They are the bosch universal ones. I read after installing that those aren't the best to get, but they are the cheapest. Anyway, I am now wondering if my cat is bad and what I should do about these stinkin o2 sensors. Please help me fix this problem so it won't come back again. Thanks, Andrew Reply With Quote 09-21-05,10:34 AM #2 98CoupeV6 View Profile View Forum Posts lots and lots of fail Join Date Dec 1999 Location Deeeeeeeeeeeeeeetroit Posts 23,004 Why are you replacing O2 sensors? P0420 is a catalyst efficiency code. Edit: In my AV6, anyway. What engine do you have? 2003 San Marino Red Accord Coupe EX-V6 6MT IMM244k miles www.lemons300zx.blogspot.com Reply With Quote 09-21-05,10:38 AM #3 Vladi17 View Profile View Forum Posts Registered User Join Date Feb 2005 Posts 13 Its a V6 The code states that "Catalyst System Efficiency Below Threshold", I was told this was a problem with the o2 sensors from reading other forums. Problem seemed to go away after I replaced the sensors but then came right back months later. What should I do?? Oh yeah, its also automatic. Same year as yours too (1998). Do I need to replace the cat converter? Tranny is also starting to slip a bit, errrr Reply With Quote 09-21-05,10:46 AM #4 98CoupeV6 View Profile View Forum Posts lots and lots of fail Join Date Dec 1999 Location Deeeeeeeeeeeeeeetroit Posts 23,004 Originally Posted by Vladi17 The code states that "Catalyst System Efficiency Below Threshold", I was told this was a problem with the o2 sensors from reading other forums. Problem seemed to go away after I replaced the sensors but then came right back months later. What should I do?? Oh yeah, its also automatic. Same year a