P0420 honda accord

First Honda I have ever owned and just purchased as a 3rd car for kids. Has 153k miles and just got the P-0420 code. Plugged in the scanner (See image inserted below), went to live data, and the O2B1S2 sensor was up and down between 0.85 --> 0.15, this sensor is the downstream (after the first CAT just off the manifold) ON the scanner …

P0420 honda accord. driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Content on driveaccord.net is generated by its users. driveaccord.net is not in any way affiliated with Honda Motor Company VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada

The most common cause of the P0420 engine code is a degraded catalyst. Catalytic converters/catalysts break down over time and can also become clogged. Cylinder misfires will significantly reduce ...

Hey guys! I'll be replacing the front cat on my Accord due to me having a P0430 CEL. There isn't a video on Youtube currently on how to replace it so I decid...HONDA and ACURA ; Accord ; P0420 code P0420 code. By s_frost May 3, 2012 in Accord. Start new topic; Recommended Posts ...If that sensor starts to fail, it can cause both of those codes. First fix the O2 sensor. Clear the codes and drive it for a couple days. If the light comes back on with the P0420, you'll likely need a catalytic converter. TrippyJesus is right you need to address the P1039 first then see if the P0420 comes back.Sep 12, 2023 · Honda Accord P0420 OBDII Meaning. P0420 is a failure code from the OBDII system. The code is short for Catalyst System Efficiency Below Threshold. In every Accord, at least two oxygen sensors are installed, both about the back and front of the exhaust system regardless of mode. One of the primary responsibilities of oxygen sensors is to detect ...How to Fix EGR Low Flow code P0401 on Honda Accord | How To Clean Clogged EGR intake Passage Way YourselfHonda Accord SE - Year: 2002Miles: 280KProblem: Engi...

ElPigto Discussion starter. 25 posts · Joined 2008. #1 · Dec 15, 2009. My CEL just came on today. I took it to advance auto parts and they told me I have P0420 Code (Catalyst efficiency below threshold bank 1). My car is a 1999 Honda Accord V6 EX with almost 120k miles on it. I always pump gas at either Shell, Exxon or Texaco (mostly Shell).Videos are for Knowledge & Entertainment purposes only. Due to factors beyond the control of RB The Mechanic, it cannot guarantee against unauthorized modifi...The P0420 code is a common issue faced by Honda Fit owners. This subheading will aim to provide a comprehensive understanding of what the code means and its implications. Answer: The P0420 code in the Honda Fit is related to the vehicle's catalytic converter efficiency. It indicates that the catalytic converter is not functioning efficiently ...El código OBD2 P0420 es uno de los problemas más comunes en los vehículos. Este código indica una disminución en la eficiencia del sistema de catalizador del vehículo y puede tener varias causas, como problemas con el sensor de oxígeno, el convertidor catalítico y el sistema de escape.. Los síntomas más comunes incluyen problemas en la aceleración y aumento del consumo de combustible.150,000 MILES. I have a 2001 Honda Accord that has had the check engine light come on about 5 times in the past few months. First it was the temperature gauge (so I replaced it), then it was the 02 sensor (had it replaced) now I am getting a P0420 code. I am getting full maintenance done in about a week and decided to have the guy clear the ...

Honda Accord P0420 Code. The Honda Accord P0420 code is an indication that there is a problem with the catalytic converter on the vehicle. This code is associated with the oxygen sensor, and can be caused by a variety of problems. It is important to identify and diagnose the problem in order to prevent further damage to your vehicle.2008 honda accord Code P0137 Upstream and replaces downstream sensor also. If you scan your vehicle and you get code PO137. Just replace the upper sensor.Definition meaning and fixes for a Honda P0420: Catalyst System Efficiency Below Threshold Bank 1Jul 4, 2018 · Why does code P0420 affect HONDA applications more than others? While code P0420 is a very common code across all manufacturers, some Honda models and most notably sixth-generation Honda Accord models from the early 2000’s were plagued by substandard catalytic converters that were known to fail prematurely.The PCM needs to see a slower switch rate from the downstream sensors as compared to the upstreams. Basically, the downstreamers should see less hydrocarbons, more oxygen and therefore put out a lower voltage than the upstreamers. The PCM compares this ratio and will set the P0420 if the minimum isn't met.

Replace honeywell thermostat with nest.

1998 Honda Accord LX 4 cyl auto-check engine light came on-codes P0420-catalyst sys efficiency below threshold-what can be done to fix this and P1456-evap emission contol system leak detected ... I GET THE FOLLOWING CODES ON MY HONDA ODYSSEY 2000 P0401, P0420 AND P1456. SAM ...As for the P0420, given the issues with the fuel trims, let it run a few hundred miles and see if it clears. Otherwise, get a high quality replacement direct fit Catalytic Converter. ... Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. Show Less . Full Forum Listing. Explore Our …The P0420 code is a diagnostic trouble code that indicates a problem with the catalytic converter. If you don't know what it is, let's just say that the catalytic converter is a key component for reducing gas emissions within your exhaust pipeline. ... Honda Accord: We found out from several mechanics that this model suffers from the code ...I have a 2004 Honda Accord LX Sedan, 2.4l 4 cylinder, 5 speed manual, ~176,000 miles. ... P0420 has been the only consistent code whenever the CEL turns on and it seems like P2649 is more intermittent, though it's been consistent lately. I can't find much information about this code online anywhere, other than it seems to be related to …El código OBD2 P0420 es uno de los problemas más comunes en los vehículos. Este código indica una disminución en la eficiencia del sistema de catalizador del vehículo y puede tener varias causas, como problemas con el sensor de oxígeno, el convertidor catalítico y el sistema de escape.. Los síntomas más comunes incluyen problemas en la aceleración y aumento del consumo de combustible.

Plus their labor rates would be lower than the dealer. 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 ...Code P0420 Toyota Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...P0420 is a common error code for Honda Accord that indicates catalyst system efficiency below threshold. Learn the possible causes, signs and how to diagnose and fix this code with tips and tools.Visit me at: http://www.ericthecarguy.com/O2 Sensor Video: https://www.youtube.com/watch?v=NIzcztO-CCsDiscussion about this video: http://www.ericthecarguy...104 posts · Joined 2013. #1 · Nov 27, 2015. i have a 2007 honda accord lx 4cyl sedan. last august while driving from new York city to Pennsylvania {i-80} i got a check engine code of p0420. i cleared the code when i got back home and the code never popped up . i thought it was a fluke and forgot about it.The P0420 code people have that code come and go all the time. The P0341 code is a cause for concern, you should check the timing and the condition of the chain and tensioner. Solving the P0341 code will help the catalyst below threshold P0420 code. I would pull the valve cover check that the timing marks line up and look at the condition of ...DmansLude. 637 posts · Joined 2008. #5 · May 26, 2009. The rear O2 is not the one that you want to change when you got a P0420. Because the ECU monitors it and the front O2 to compare for similar activities. The goal is to have the front as responsive as possible to the ECU rich lean command.In general the P0420/P430 code is really a bad catalytic converter. The issue is what cause the Catalytic Converter to go bad. You need to solve that problem before replacing a Catalytic Converter. That requires troubleshooting the current issue carefully. It may be as simple as a bad sparkplug or a bad fuel injector.as a pass smog tech with a bar90 We learned that p0420 indicates that your 02 sensor is getting a high reading of Hydrocarbon (HC) or unburned fuel but at the same time this reading can be a result of a faulty 02 sensor, worst case scenario is a bad catalytic converter. ... 2010 Honda Accord - LX - Polished Metal Metallic - 92k miles - Bought ...Aug 7, 2014 · greg1c. 5852 posts · Joined 2013. #5 · Aug 9, 2014. Here is the information I will tell you about P0420 (bank 1) and P0430 (bank 2), as you know both codes for Catalyst system efficiency below threshold. The way the ECM determines this is from the waveform of the downstream (after the catalytic converter) O2 sensor.To diagnose the P0401 2000 Honda Accord code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

First Honda I have ever owned and just purchased as a 3rd car for kids. Has 153k miles and just got the P-0420 code. Plugged in the scanner (See image inserted below), went to live data, and the O2B1S2 sensor was up and down between 0.85 --> 0.15, this sensor is the downstream (after the first CAT just off the manifold) ON the scanner under live data there is also a point called O2SLOC and he ...

P0420 doesn't always mean a pre-cat replacement but it will if you ignore it and allow whatever is throwing the code to go unaddressed. And as others have said, the code may disappear but it will come back. ... 2003 Honda Accord EX-L Sedan 3.0L V6 A/T **DECEASED 10/05/2018** 240,000 miles on original transmission! Satin Silver Full Nose Mask & BraAug 20, 2015 · p0420, Yay! A few days ago the check engine light came on in my '04 Accord Ex I4 5-manual. For the second time in 155k it turned out to be P0420, Catalyst below threshold, bank 1. The first time was at 70k, the check engine light went on and off for a time.Pristina, Kosovo. The District of Pristina ( Albanian: Rajoni i Prishtinës, Serbian: Приштински округ, Prištinski okrug) is a district in Kosovo. Its seat is the capital city of Pristina. [2] It consists of eight municipalities and 298 villages. [3] According to the 2011 census, the total population of the district is 477,312.2010 Accord V6 - P0420 . Hi all, I have the p0420 code on my v6 accord. I installed the svcm at 90k miles, car currently has 125k miles. ... Created by Honda Enthusiasts. All Things Accord Related. Pics / Videos / Stories / Advice & More! Members Online. Okay, okay, I get that the forged carbon doesnt photograph well. ...Honda accord tank fuel gas leaking 2001 p0420 cy codes p1457 displayed 1998 two canister charcoal located enlarge clickSensor o2 accord p0420 v6 0l locate Honda odyssey p0420? lets try some lacquer thinner.Honda p0420 q&a: causes, symptoms & solutions.Aquí hay algunos pasos para arreglar un código P0420 Honda Accord. Primero, retire el sensor de O2 y vierta de 4 a 6 onzas de espuma de mar en la abertura, reemplace el sensor y déjelo toda la noche. Restablezca el código y luego continúe conduciendo.Honda p0420 sensor code accord catalytic converter 1998 ex connection rear graphe randomHonda p0420 crv code 2002 system cheat Honda p0420 accord 1998 code exP0420 crv diagnostics accord. Check Details. Honda accord. P0420 honda accord 2007 4l code engine showing rating answer fix remember please leave .. Check Details. Check Details. HONDA ...[2007 Honda Accord EX] Got code P0420 and P0325 but not sure if one is caused by the other, could use some help! ... On Hondas, a P0420 usually means the cat converter is dead. Reply reply Top 1% Rank by size . More posts you may like r/Cartalk. r/Cartalk. The place to talk about your car Members Online. P0420 and P0442 on 2003 Corolla 1.8l LE ...What causes bad gas in my 2003 Honda Accord EX 5 sp. sp. - Answered by a verified Mechanic for Honda. ... 2003 Honda Accord: p0420..intermittently..catalytic converter..new one. I have a 2003 Honda Accord showing engine malfunction codes P0420 and P0141. The light only comes on intermittently, but the codes are always there when I get an OBD-II ...

Subasta de carros de la policia en dallas tx.

Trillium theater grand blanc michigan.

May 2, 2024 · Learn what causes the P0420 code in Honda vehicles and how to fix it. The code indicates a malfunctioning catalytic converter that reduces emissions control and affects engine performance.Got this code on my son’s 2012 Accord SE with 228,400 miles; Catalyst System Efficiency Below Threshold Bank 1. Vehicle is running fine; no hesitation, shaking or other crazy signs of any issue going on. Trying to figure out if it’s just the O2 sensor or the Catalytic Converter. The first being the easiest and cheapest, was thinking of just ...1998 Honda Accord LX 4 cyl auto-check engine light came on-codes P0420-catalyst sys efficiency below threshold-what can be done to fix this and P1456-evap emission contol system leak detected - were p … read moreHello all, I have a 07 Honda Accord exl 2.4, recently on my trip back home about 2 hours in, my car would start jerking every time I tried to go past 3000rpm and the CEL came on. Basically the car was in limp mode the rest of trip and went about 70mph all the way home.. The codes I got were P0301 which is cylinder 1 misfire.5852 posts · Joined 2013. #5 · Aug 8, 2014. Here is the information I will tell you about P0420 (bank 1) and P0430 (bank 2), as you know both codes for Catalyst system efficiency below threshold. The way the ECM determines this is from the waveform of the downstream (after the catalytic converter) O2 sensor.Got this code on my son's 2012 Accord SE with 228,400 miles; Catalyst System Efficiency Below Threshold Bank 1. Vehicle is running fine; no hesitation, shaking or other crazy signs of any issue going on. Trying to figure out if it's just the O2 sensor or the Catalytic Converter. The first being the easiest and cheapest, was thinking of just ...P0420 - Honda Accord The check engine line (CEL) came on and we took it to Autozone to get a free code reading. It was P0420, which turned out to be a very popular code for all Honda Accords. We have a 1999 Honda Accord LX with 140K miles. We called several local Honda dealership and received an estimate of $1K to replace the catalytic ...I have a: 2013 Honda Accord LX 4 door, 4 cylinder A few days ago when it got to be below 32 degrees fahrenheit, my engine light came on. Approximately 1.5 months ago I had changed the sparkplugs (first time) I noticed there were some engine misfires that manifested by the engine loosing power when idling and slightly erratic rpms when idling ….

Wat betekent code P0420 op Honda? De P0420 Honda geeft aan dat er een probleem is met de efficiëntie van de katalysator. Motorstoringen, defecte zuurstofsensoren of problemen met het brandstofsysteem kunnen ertoe leiden dat de code wordt geactiveerd. Hoe repareer je code P0420 op de Honda Accord? Hier zijn enkele stappen om een P0420-code ...Jan 13, 2014 · P0420 Code and Fuel Trim. My Accord is the 2006 PZEV version with 92,000 miles. A few days ago I got the P0420 Check Engine Light which stands for Catalyst System Efficiency Below Threshold (Bank 1). Plugged in an OBDII tool and found that my Short Term Fuel Trim is at around 20% when idling and drops to 0 when I increase RPM to 3000.2008 Honda Accord EX-L V6 Navi 2007 Lexus SC430 V8 Hardtop Convertible, 29k Miles 2002 Lexus SC430 V8 Hardtop Convertible ... If you have the misfire repaired, I would reset the computer and drive the car and see if the P0420 will clear. Also, check the fuel trims and make sure it looks good and is close to 0. Your last thing to try would be to ...On 2/22/22 I had my catalytic converter stolen off my 2004 Honda accord LX, and I replaced it about a week later, and everything was fine. In September I smogged the car and it passed, however now in November, on three different occasions my check engine light has come on with the P0420 code. The first time I reset it, it came back on next time ...The miles per gallon estimates for the Honda Accord vary depending upon the model. The EPA rating for a four-cylinder 2014 Accord is 26 mpg in the city and 34 mpg on the highway. F...P0420 - Catalyst Efficiency Below Threshold (Bank 1) P2271 - Rear Secondary H02S (Bank 1, Sensor 2) Circuit Signal Stuck Rich. P2271 - Rear Secondary H02S (Bank 1, Sensor 2) Circuit Signal Stuck Rich. The car is currently just shy of 180,000 miles. The check engine light popped on at 178,700 miles for a few days, then disappeared until now.Honda Accord P0700 Definition. A typical transmission control module. The P0700 code in your Honda Accord is a generic OBD-II code that indicates a malfunction within the transmission control system. This code is not specific to any particular issue but rather points to a general fault in the system. Additionally, the P0700 code usually appears ...2007 Honda Accord @67K miles. Ck Engine light appeared. Took to dealership and diagnostic test showed CODE p0420. WARRANTY 8/80K miles covered the catalytic converter, but was told the warranty DOES NOT COVER THE O2 SENSOR.Dec 14, 2019 · At 313K miles (2007 4CYL Accord SE) my check engine light came on. There was a single DTC: P0420 Catalyst System Efficiency Below Threshold Generally speaking this code indicates a bad catalytic converter, but I went through some diagnosis to try to make sure before buying an expensive... www.driveaccord.net. P0420 honda accord, A P0420 code is set when the upstream sensor and the downstream oxygen sensor sense the catalytic converter is not doing its job. Basically, the amount of oxygen going into the converter is not being burned, and it detects it through the downstream sensor. Oxygen is the key here. Modern Engine Management Systems leave a little bit of extra ..., P0420 code. Bought my 2013 I4 coupe last month with 120k miles on it, currently went over 121k miles recently. Passed NJ inspection last Friday and the p0420 code came on last night. Car drove fine all day until last night where it felt sluggish and didn’t want to accelerate., P0420. Jump to Latest Follow ... 2010 Honda Accord - LX - Polished Metal Metallic - 92k miles - Bought used in September 2012 with 11k miles Wrecked. Save Share. Like. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread., Definition meaning and fixes for a Honda P0420: Catalyst System Efficiency Below Threshold Bank 1, Feb 21, 2014 · Have a 2007 Honda Accord SE with 216,000 on it. It has the 2.4. Last week the light came on so I read the codes and got the two in the title. It still had the original front and back o2 sensors in it. I purchased a NTK for the rear and installed it. The p0139 code went away but the dreaded p0420 still is there and after I erase the code it will ..., Unfortunately, the P0420 is a fairly straight forward code, and a fairly common Honda problem. This code points to a failing Catalytic Converter. The Oxygen Sensors measure the amount of emissions in the exhaust going into, and then out of the converter. When they see that the converter is not "cleaning" the exhaust enough to …, 2008 Honda Accord EX-L V6 Coupe w/ Navi Previous Cars: 2004 Accord EX-L I4 2000 Accord EX V6. Save Share. Like. Sort by Oldest first ... P0420 codes. It also has 175,000 miles on it so, to me at least, it honestly could be either the sensor or the catalytic converter. Is there any way to figure out which one is the culprit?, Te suministramos todo lo que necesitas saber sobre el código DTC P0420: ️ Descripción, ️ causas, ️ síntomas y ️ posibles soluciones.LEER SOLUCIÓN DEL CÓD..., How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av..., P0420 Code in Honda. This is typically associated with a faulty catalytic converter, oxygen sensors, or an exhaust leak. Some of the most common solutions include replacing the catalytic converter or oxygen sensors, or addressing the exhaust leak. Regular servicing to diagnose these problems early can prevent this code from reappearing., In today's video Mike and Drew review the ramifications of not dealing with a P0 420 trouble code on a 3.5 L Honda engine.Leaving it too long will cause cata..., driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Content on driveaccord.net is generated by its users. driveaccord.net is not in any way affiliated with Honda Motor Company VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, Thanks to virtual reality, Honda is relying less on a car design practice that’s (literally) shaped auto making since the '30s. Honda is pulling away from a design practice that’s ..., 2007 Honda Accord @67K miles. Ck Engine light appeared. Took to dealership and diagnostic test showed CODE p0420. WARRANTY 8/80K miles covered the catalytic converter, but was told the warranty DOES NOT COVER THE O2 SENSOR., Tech Notes. As the code description implies, the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory expects). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst ..., May 1, 2024 · This engine code could also be caused by: Having a dirty air filter. The engine control module (ECM) is faulty. Timing of the ignition is incorrect. Spark plugs that are faulty. Fuel injector (s) leaking. One or more fuel injectors are faulty. Oxygen sensor malfunction. Leaks in the intake air., May 1, 2024 · This engine code could also be caused by: Having a dirty air filter. The engine control module (ECM) is faulty. Timing of the ignition is incorrect. Spark plugs that are faulty. Fuel injector (s) leaking. One or more fuel injectors are faulty. Oxygen sensor malfunction. Leaks in the intake air., Berikut beberapa langkah memperbaiki kode P0420 Honda Accord. Pertama, lepas sensor O2 dan tuangkan 4-6 ons seafoam ke dalam lubangnya, ganti sensornya, dan biarkan semalaman. Setel ulang kode lalu lanjutkan mengemudi. Tambah jarak antara sensor oksigen dan konverter menggunakan busi non-fowler., What follows is a rudimentary explanation of how the RC circuit works to fix the P0420 code. We all know that the secondary O2 sensor measures voltage and monitors the cat's performance. The signal coming off of a failing catalytic converter has varying amplitude and frequency and is rather disorganized., If the fuel trim trims look good, this rules out a mixture problem that could be fouling the catalytic converter and be the root cause of the P0420 code. 2. Check for exhaust leaks between the engine and the catalytic converter. At least historically, this has been reported to have caused false oxygen sensor readings., The P0325 code in a Honda Accord refers to a malfunction in the Knock Sensor 1 Circuit. It indicates that the engine’s control module (ECM) has detected a voltage signal from the knock sensor that is either too high or too low. The knock sensor is responsible for detecting vibrations caused by engine knock or detonation, helping the …, I have OBD II codes p01738, p0700, and p0420. Honda put a rebuilt transmission in my 99 acord about 30k miles ago. - Answered by a verified Mechanic for Honda. ... I have a 1998 Honda Accord V-Tech which started having a problem with the check engine light coming on about 2 years ago. Each time they run a diagnostic, the code is P0420., Jan 17, 2024 · The P0325 code in a Honda Accord refers to a malfunction in the Knock Sensor 1 Circuit. It indicates that the engine’s control module (ECM) has detected a voltage signal from the knock sensor that is either too high or too low. The knock sensor is responsible for detecting vibrations caused by engine knock or detonation, helping the ECM ..., The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ..., Honda is spending $700 million to retool three of its Ohio plants to build electric vehicles as it aims to phase out gas engines by 2040. Honda said on Tuesday it is spending $700 ..., May 2, 2024 · Learn what causes the P0420 code in Honda vehicles and how to fix it. The code indicates a malfunctioning catalytic converter that reduces emissions control and affects engine performance., P0139 is a common OBDII code that occurs in many vehicles, including the Honda Accord.The code is triggered when there is an issue with the response time from the oxygen (O2) sensor when switching voltage levels. The Oxygen sensors are responsible for helping the ECM meter oxygen levels in the exhaust, and helping to to create the ideal air/fuel mixture., The ECL on my 2006 Honda Accord SE 4cyl has been coming on for the past couple of years at the same time of the year - Answered by a verified Mechanic for Honda. ... I get trouble code P0420 on my 4 cylinder,XXXXX Honda CRV, Catalist below threshold Bank 1. It's been about a year since I replaced the o2 sensors which seemed to fix the problem then., Now 10k miles later the P0420 code has been set again. There are two confusing things. (1) After warming up the catalytic converter by driving for about 30 mins on the highway I read the following temperatures with an infrared thermometer: converter input (read directly on the top O2 sensor - accessible from top of engine bay) ~ 390 degF., 3. Subaru & Honda. If you find a P0420 code in your Subaru or Honda, it’s most likely the catalytic converter to blame. It can also be caused by an exhaust leak or a bad oxygen sensor. Check for vacuum leaks or other fuel mixture-related engine codes. Check for any exhaust leaks before the catalytic converter., By following these preventive measures and adopting good maintenance and driving practices, you can minimize the risk of encountering Code P0420 errors in your Honda Accord. Remember, a well-maintained and efficient catalytic converter not only ensures a smoother driving experience but also contributes to a cleaner and greener environment., Hello I will help, For the P0420 I would change the rear O2 sensor before I put a cat in it. On Hondas this will often satisfy the computer. The 83-1 is loss of communication from the ECM. If the battery went dead or there has been water in the cabin I would erase the codes, change the rear O2 sensor and see what comes back in a couple of weeks., 2004 Honda Accord EX 2.4L Code P0420. by marinav305 » Thu Oct 04, 2007 1:33 pm. Well, I just purchased a 2004 Honda Accord EX, with 2.4 L engine, 50k miles with automatic transmission. About 3 days ago, I dumped some fuel injector cleaner in my tank, and the next day when I went to turn on the car, the engine light came on.