Honda odyssey p0420 code

Honda Odyssey Ownership. Problems and Concerns. P0420; enough is enough!! Jump to Latest Follow ... Got the famous P0420 code and it's time for smog test for registration renewal. Instead of going expensive route replacing rear O2 sensor and cat, pour 1/2 can of Seafoam into the gas tank and the other 1/2 to my oil crank case. ...

PCM P0301 indicates enough misfire events on cylinder 1 for the powertrain control module (PCM) to store the misfire code. There is a misfire in cylinder 1 or a randomly occurring misfire. If there are no leaks in the intake, check the spark plugs for cylinder 1 and replace them if necessary. It may be necessary to perform more tests to ...P0420 - Cat Code. Jump to Latest ... Bolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic - 110k miles - Bought brand new in August 2006, never any major repairs, possibly the most reliable Odyssey on the road Victus - 2012 Honda Accord - EX-L V6 - Crystal Black Pearl - 39k miles - Bought used in July 2022 with 23k milesSOURCE: Question regarding a honda odyssey 1999 check engine light codes. Ramon P0420 relates to the catalytic converter. The computer sees little or no improvement in the exhaust before and after going through the converter.Quick overview of cause and fix for a P3400 error code in a Honda. Link to article: https://www.backyardmechanic.org/how-to-fix-honda-engine-error-code-p3400/I have replaced the EGR and Cat. Conv. last year after same codes appeared and seemed to clear up the problem until several months ago. I did not use OEM parts since Honda wanted over $1100 for the converter alone and over $400 for the EGR valve! Did both for $300 instead of $1500.And when p0420 shows, it most likely is a worn CAT, but in pratice most place try to get you replace the sensor first. And in most cases, it just drain your wallet and drive people nuts. it might disappear for months, but eventually the code p0420 will come back if you don't replace the CAT. K. kgardonia. 240 posts · Joined 2010. #4 · Nov 2 ...After all this, I still had the P0420 code. I'm pretty confident the clogged EGR had damaged my cat with too high EGT, to the point the P0420 code was being triggered, but not enough to really affect the quality of the van's emissions. ... 2010 Honda Odyssey EX-L w/RES: 112K Miles. TruCool LPD4544 Cooler, Weathertech's, OEM Fog's, VCMuzzler II ...

4'th Cylinder. P0304 is a cylinder-specific misfire code, meaning only your Odyssey's fourth cylinder has a misfire. Before you can even diagnose P0304 in your van, you need to find the fourth cylinder's location. On "V" configuration engines, it'll usually be the second cylinder on the head further away from the front of the engine.2000 Honda civic check engine code p0420. P0420 check engine code (honda fit) techron, possible causes and remedy Honda code p0420 Code p0420 honda odyssey. Honda check code 1998 p0420 accord ex 2008 graphe random component step. P0420 code on a honda 3.5l v6 @urbanautomotive01P0420 p0430 pdf Honda pilot bank converter catalytic 2008 code p0420 ...Unfortunately, the sensors will not cause a P0420 and P0430. Those codes are set when the sensors are working properly and detect an issue within the catalytic converter. There is an extremely slim chance that an exhaust leak could cause the code, but you'd have to have an exhaust leak on both sides of the engine and it would be very obvious.Jan 14, 2008 · The Odyssey is a 2000 model, 123K miles. It runs great, no concerns over mileage or performance. The CEL has been on for many months, but occasionally will turn off for a day or two. It recently prompted me to get the codes checked at Autozone since the light recently came on again after it's short break. Codes are P0420 and P1456.7371 posts · Joined 2020. #2 · Jan 7, 2024. DTC P0420 Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) if your VCM is still active, suggest you read the VCM megathread. Shaque-ymm.The 1969 Honda Dream 305 motorcycle combined power with convenience. Read about this important Honda and see pictures of a real dream machine. Advertisement The 1969 Honda Dream 30...This is an update on my 1999 Odyssey with the PO420 code. I now have 203600 miles on my 1999 EX and have been seeing the PO420 code since 99,500 miles in 2003. At first the code would only be on for 1-2 weeks at a time, then off for several months. By my 2006 inspection, the light was on most of the time, but I was able to pull the fuse to ...

I've had other aged cars throw similar evap codes (especially in sub zero F conditions) and I would clear them and they would often come back, but when spring rolled around they would go away. ... Past - 2012 Toyota Sienna Base-Gray, 2007 Honda Odyssey Touring-Silver, 2010 Acura MDX, 2006 Subaru Legacy GT, 2001 Toyota Celica GTS, 1992 & 1993 ...2018 Honda Odyssey Elite - P0420 - Emission System Problem. Today, when i was returning back home, In Mid of the Road, I got Emission system Problem. So I drove direct to AutoZone to Scan the code. It Showed P0420. - Catalytic System Efficiency Below Threshold Bank 1. I bought this used vehicle last June 23.P0420 catalyst below threshold '00 EX, 97000 miles. One month ago, CEL came on and Autozone diagnosted the problem as 02 sensor or bad plug, so I go for cheaper 'fix' and install new plugs. Now, yesterday, I get CEL and get P0420 code. Autozone reset the CEL. Today, CEL is back on with same code.P0420 Code. Jump to Latest Follow ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less . Full Forum Listing. Explore Our Forums. 2005 - 2010 Odyssey 2011 - 2017 Odyssey 1999 - 2004 Odyssey 2018+ Odyssey Problems and Concerns.Honda online store : 2018 odyssey exhaust pipe - muffler parts. Check Details. Exhaust pipe for 1999 Honda ODYSSEY RA3 | General sales region. Check Details. Check Engine Light Code P0420 Honda Odyssey | Americanwarmoms.org. Check Details. Car Exhaust System Explained - Parts, Design, Construction, Working & more. Check Details

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Nov 30, 2022 ... Troubleshooting a HONDA P0157 Code, :Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2)."A trip to AutoZone revealed a P0420 code from the OBDII. Specifically it says "catalyst system efficiency below threshold bank 1". ... P0420 refers to bank 1, on a Honda that's the bank closest to the firewall. P0430 refers to bank 2, closest to the radiator. 2010 Pilot EX-L, 2009 VW Jetta, 1969 Dodge Dart Swinger 340. Save Share. Like. I.2005 HONDA ODYSSEY. 3.5L. 6 CYL. FWD. AUTOMATIC. 168,000 MILES. I came across your site as I was trying to learn how to solve a problem. I am the original owner of the van listed above. I am looking to solve an issue with the car "burning" too much oil and determining the true cause of a P0420 engine code (Catalyst System below efficiency).What Does Code P0456 Mean? P0456 definition: Evaporative emission control system leak (small).; Issue Severity: LOW - Continued driving for a short period of time is okay Repair Urgency: Get this fixed within the next month to prevent drivability problems and excessive fuel consumption. Diagnosis: It is unlikely the driver will notice any symptoms with check engine light code P0456 other ...If it's taking 6 weeks to set the code there's no reason to think the P0420 will set immediately after removing the defouler, especially if the cat is right on the edge, just as you suspect. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less . Full Forum ...

2001 Honda Odyssey P0420 2001 Honda Odyssey, Code P0420 came on after 200 miles of changing an EGR valve. EGR was changed as it has a code for low flow in EGR system.Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2000 Honda Odyssey P0420 Catalytic Converter Code. This topic has 19 replies, 8 voices, and was last updated 6 years, 1 month ago by . Antonio C Michael. Creator. Topic October 12, 2011 at 11:00 am #437657.Repair Information for P0420 Honda code. Learn what does P0420 Honda Catalyst System Efficiency Below Threshold Bank 1 means and how to diagnose p0420 code H...Honda Odyssey Generation Forums. 2005 - 2010 Odyssey Short Term Fuel Trims High, drop with increased RPM, 0420 code ... So I have had an P0420 code for about a year now. Mechanic said it is a bad cat converter after replacing bank 1 sensor 2 - rear downstream O2 sensor, with no effect.Conclusion. The P0420 code is a generic diagnostic trouble code that indicates a problem with the catalytic converter's efficiency in the exhaust system. It can be caused by various issues, ranging from faulty oxygen sensors to engine misfires or fuel system issues. Suppose you suspect your Honda car has this code.How to fix code p0420 or lack of acceleration on honda cr-v and otherHonda code odyssey. P0420 americanwarmoms accord exNeed help troubleshooting 2005 honda odyssey codes p0171/p0174 and p0420. 2005 honda odyssey code p0420 bank 1P0420 code fix how its done catalyst efficiency below threshold. Need help troubleshooting 2005 Honda Odyssey codes ...2010 Honda Odyssey EX-L; 160,000 miles; VCM is Muzzled (original VCMuzzler) Cleveland, Ohio USA. ... They are functioning if the computer is even able to throw the P0420 code in the first place. I have fixed several P0420 codes by replacing both the upstream and downstream sensors. The reason I do it is that after 130-150K miles they are worn ...P0420 code honda sensorCode p0420 honda odyssey 2011 honda pilot p0420 code2013 chevy equinox p0420. Sensor location p0420 p0172 code o2 p0430 bank1 ridgeline locations honda sensor2 only 2008 rear mpg preventative maintenance question located . Check Details. Check Details. Have a p0420 on 2002 honda civic ex.

In this article, we dive into the world of Honda Odyssey check engine light codes. Honda Odyssey is a popular minivan known for its. Mechanics news. Automotive Mechanics; Industrial Mechanics; ... It will provide a brief overview of each code and its possible causes: P0420: Catalytic Converter Efficiency Below Threshold - Possible causes ...

Honda Odyssey Generation Forums. 2005 - 2010 Odyssey P0420 Code - Replaced O2 Sensor - Check Engine ... So I got the dreaded P0420 code for my check engine light. I replaced the affected O2 sensor and was problem free for a few months, but now the check engine light is back.Code P0430 means that the downstream oxygen sensor from the catalytic converter on bank 2 detects the cat isn't operating to efficiency standards, based on factory specifications. The P0430 trouble code is considered generic, meaning it occurs on vehicles of any type and model. The P0430 shows a problem with the emissions system.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.Apr 17, 2021 ... Honda Fuel injectors issue, MIL, trouble codes P0420/P0430, P030x, and/or P219A/B warranty extension · Comments22.The Ody has an A/F ratio sensor rather than an O2 sensor for the upstream sensors which makes it a bit harder to confirm by watching O2 sensor data on a live data scan tool. The P0420 and P0430 codes are set when the downstream O2 sensor code is following the upstream sensor, meaning the cat isn't doing anything.P0420 on 2005 Ody w/130k miles. This code had been coming on and off a couple years ago, then was solidly on just prior for need for CA emission testing. That time,I ran G2P and the light went off while driving! It got and passed smog inspection shortly thereafter.P0420 honda civic Top 77+ imagen 2006 honda odyssey bank 1 sensor 2 location P0420 honda converter catalytic threshold below efficiency system accord bank 2001 where troublecodes location sensor located. ... gmc sensor location o2 2010 buick engine code where 2009 enclave p0420 find qa causes possible list gif How to fix p0420 code honda ...My luck with chevron techron in clearing up the P0420 code seems to have ended - that was good 5 years. I dose my gas tank 2X and still got the CEL right back. First dose was a full tank (20 oz.) and it took about 250 miles before CEL came on. The second was half tank(12 oz.) and it took only 10 miles before CEL came back on.An increase in emissions is often linked to the P0420 Honda code. That, coupled with a peculiar rotten egg aroma from the exhaust, should be enough to raise eyebrows. Step-by-Step Guide: Diagnosing and Fixing P0420 Honda. Navigating the P0420 Honda code can be daunting, but with the right steps, you can diagnose and resolve the issue.

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Feb 8, 2009 · Code is P0420 catlatic system efficiency below threshold bank 1. Any advice will be appreciated. Search did not bring any 05 oddys. Thank you. AV. 14 Odyssey Touring Elite Pearl White (Muzzled) 11 Odyssey EX-L Gold (Muzzled) TOTALLED. 14 CRV Touring White SOLD. 09 Odyssey EX Navy Blue SOLD.An EVAP fault (especially the 'small leak' one) should not throw a P0420. Make sure the rear vapor tubing is 'tight', if nothing is found, you might have an issue with a vapor valve or control solenoid. You have done everything except for the valve adjustment. It is a 2 - 3 hour DIY the first time.Do you have a 2005-2008 Honda Pilot, Ridgeline, Odyssey and Acura MDX V6 and are experiencing a code P0420? Watch this video for helpful information.I live in DC and just bought a Honda Odyssey 2001 EX. I failed the inspection test because of the catalyst system. Following is the test result: GAS CAP PRESSURE RESULT: OBD RESULT: MIL COMMANDED ON 1 TROUBLE CODE REPORTED: P0420 Catalyst System Efficiency Below Threshold (Bank 1)I ended up replacing most of the part in the EVAP system - not impressed with my trouble shooting skills, but believe finally resolved. Started at 198,000 miles with the codes P0497 and P145C - vehicle was new to me so had limited history. Replaced gas cap - codes still present. Replaced Fuel Vapor Solenoid - code cleared.2018 Honda Odyssey Elite - P0420 - Emission System Problem. Today, when i was returning back home, In Mid of the Road, I got Emission system Problem. So I drove direct to AutoZone to Scan the code. It Showed P0420. - Catalytic System Efficiency Below Threshold Bank 1. I bought this used vehicle last June 23.I'm working on my 08 odyssey (j35a7 engine) and I'm getting P0420 and P0430. To me it seems unlikely, ... Related Honda Odyssey Honda Honda Cars and Motor Vehicles forward back. r/AskMechanics. r/AskMechanics. Members Online. P0420 and P0171 Codes on 2003 CorollaHome › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2000 Honda Odyssey P0420 Catalytic Converter Code. This topic has 19 replies, 8 voices, and was last updated 6 years, 1 month ago by . Antonio C Michael. Creator. Topic October 12, 2011 at 11:00 am #437657. ….

When the P0133 code is set, it means that the O2 sensor isn't altering the voltage output as it should when the air-fuel ratio changes. For that reason, it's categorized as having a slower response than normal. This code indicates trouble with oxygen sensor #1 on bank #1, which is on the same side of the engine as cylinder #1.Quick overview of cause and fix for a P3400 error code in a Honda. Link to article: https://www.backyardmechanic.org/how-to-fix-honda-engine-error-code-p3400/It should the 2 up-stream O2sensors at the same timeBolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic - 110k miles - Bought brand new in August 2006, never any major repairs, possibly the most reliable Odyssey on the road ... The P0420 code will continue to pop up on occasion while the problem persists. What I've noticed in my Accords is that cold weather, lower quality fuel, longer hill ...Have a Honda odyssey 2000 3.5lt with the error code p4020 catalyst below efficiency on bank 1. I put in a new catalytic - Answered by a verified Auto MechanicHonda Odyssey Generation Forums. 2005 - 2010 Odyssey P0420 Code - Replaced O2 Sensor - Check Engine Light is Back ... So I got the dreaded P0420 code for my check engine light. I replaced the affected O2 sensor and was problem free for a few months, but now the check engine light is back. I've been disconnecting the battery to reset it, but the ...M. msavy11 Discussion starter. 86 posts · Joined 2007. #1 · Jul 10, 2009. 2000 EX 138k. The P0420 code has been on for nearly 1-year. I am about to have a cat installed, but wanted to check the forum first to see if there is anything else I need to address since it's gone ignored for so long.Honda CR-V P0420 Code Symptoms. The P0420 code in a Honda CR-V will often be thrown if one of your vehicle's oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. For most people, the first sign that anything is wrong is the service engine soon light coming on.Diagnostic trouble code (DTC) P0420 stands for “P0420 Catalyst System Efficiency Below Threshold (Bank 1).” It indicates that the exhaust system’s oxygen … Honda odyssey p0420 code, If the P0420 code is combined with other codes, try addressing the other codes first There is a Factory Service Bulletin for the following Honda models: 2003-2005 Honda Civic Hybrid ULEV (KA) 2002-2006 Honda Insight With M/T Honda Civic, Insight Factory Service Bulletin OBDII Code P0420, I am getting several DTC on 2005 Honda Odyssey( p0420, p0430. p0404, p2647, and several random misfire). The most concern I have is the P2647. Can you give me some insight on this one , It appears to …, I'm getting P0420/430 codes and want to start small before having to replace the catalytic converter. I started with some some cat cleaner from O'Reillys, and now looking into what O2 sensors i should replace. ... Bolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic - 110k miles - Bought brand new in August 2006, never any major repairs ..., Diagnostic trouble code(DTC) P0420 stands for "P0420 Catalyst System Efficiency Below Threshold (Bank 1).". It indicates that the exhaust system's oxygen levels are below the required threshold in Bank 1, which can damage the engine's exhaust and fuel system. Bank 1 refers to the side of the engine that houses the number one cylinder., Honda Odyssey 2005 Turing 14300 kms. Código P0420. Tengo problemas en mi odyssey 2005 el codigo es p0420 parece que es el catalitici alguien me puede ayudar. Miguel de Estados Unidos hace 7 años . MI. Comentar Me pasó lo mismo. 3 casos . 2. RO. Roheza de México hace 3 años., 2010 Odyssey with P3497 P3400 P0430 P0420 and P0128 worth $3000? ... Bolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic - 110k miles - Bought brand new in August 2006, never any major repairs, possibly the most reliable Odyssey on the road ... It is possible the codes area red herring, but a mech should be able to tell pretty quickly., Troubleshooting a HONDA P0139 "O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)." code as well as fixes., P0154 is a relatively common trouble code. It's generic, which means that it has the same meaning for any vehicle with OBDII ( Honda Odyssey or not). It means that the PCM/ECM is not detecting any activity from the sensor. There can be many reasons for this code to throw. These include a bad o2 sensor, blown heated element fuse, and wiring ..., My 2000 Odyssey currently has 130K miles on it. Within the last 4 years, I've had the CEL come on and off year round. ... Honda Odyssey Generation Forums. 1999 - 2004 Odyssey. My take on P0420 issue. 14892 Views 64 Replies 16 Participants Last post by stangsteve, Sep 6, 2011. R. Rnafong Discussion ..., Honda Odyssey Generation Forums. 2005 - 2010 Odyssey 2005 odyssey engine light on, code p0430, help ... P0420 2001 odyssey I bought my van at 89000 miles and when I got to 150000 I had code p0420 just like what everyone here is talking about. The code had been ON and OFF, some 10k-15k, some a few thousand miles., The codes P0420 and P0430 indicate that the catalytic converters are not performing as efficiently as they should be. This could be caused by various factors, such as excessive oil consumption, misfiring, faulty oxygen sensors, or poor fuel quality. The most common fix for P0420 and P0430 in the Honda Odyssey is to replace the catalytic ..., Codes P0172 and P0420. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less . Full Forum Listing. Explore Our Forums. 2005 - 2010 Odyssey 2011 - 2017 Odyssey 1999 - 2004 Odyssey 2018+ Odyssey Problems and Concerns., Sep 27, 2021 · Does Cataclean really fix a P0420 / P0430 error code and catalytic converter. Cataclean Link: https://amzn.to/33t8RVQ Second channel for easy to follow Home ..., I have a 2000 honda odyssey that has thrown a p0420 code. My ODB when checking details related to code gave me the. following. p0420. throttle position @15% rpm 1426. MAP sensor. STFT1 -7.7%. LTFT1 -1%. STFT3 -100.6%., Apr 30, 2021 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈==== How to Fix HONDA P0420 ====Engine Code HONDA P0420 Saving Re..., Engine light is on and OBD scanner reads P0420 on my 2013 Odyssey. I first got this warning last December. I noticed the tear in the air intake hose and I replaced it. Then the warning light went away for about a month. When the light came back on after a month with same P0420, I deleted the code using a OBD scanner., Jan 14, 2024 · Inspect the catalytic converter: Look for any physical damage or clogging in the catalytic converter. A failing converter can trigger the P0420 code. 4. Check for engine misfires: Misfires can cause unburnt fuel to enter the exhaust system, which can damage the catalytic converter., NO - Go to step 13 and recheck. Test-drive under these conditions: Engine coolant temperature above 158 °F (70 °C) A/T in D position. Maintain the vehicle speed at 55 mph ( 88 km/h ) for 5 minutes or more with cruise control set. Monitor the OBD STATUS for DTC P0420 and/or P0430* in the DTCs MENU with the HDS., This is an update on my 1999 Odyssey with the PO420 code. I now have 203600 miles on my 1999 EX and have been seeing the PO420 code since 99,500 miles in 2003. At first the code would only be on for 1-2 weeks at a time, then off for several months. By my 2006 inspection, the light was on most of the time, but I was able to pull the fuse …, 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., Honda Odyssey Generation Forums. 1999 - 2004 Odyssey. P0420. Jump to Latest Follow 2K views 2 ..., P0154 is a relatively common trouble code. It’s generic, which means that it has the same meaning for any vehicle with OBDII ( Honda Odyssey or not). It means that the PCM/ECM is not detecting any activity from the sensor. There can be many reasons for this code to throw. These include a bad o2 sensor, blown heated element fuse, and …, I've had other aged cars throw similar evap codes (especially in sub zero F conditions) and I would clear them and they would often come back, but when spring rolled around they would go away. ... Past - 2012 Toyota Sienna Base-Gray, 2007 Honda Odyssey Touring-Silver, 2010 Acura MDX, 2006 Subaru Legacy GT, 2001 Toyota Celica GTS, 1992 & 1993 ..., Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. The “Catalytic Converter Efficiency” Diagnostic Trouble Codes (DTCs) P0420 and P0430, are among the top 10 DTCs technicians face. And while the description might imply a failed converter, odds are the ultimate fault lies somewhere …, The codes P0420 and P0430 indicate that the catalytic converters are not performing as efficiently as they should be. This could be caused by various factors, such as excessive oil consumption, misfiring, faulty oxygen sensors, or poor fuel quality. The most common fix for P0420 and P0430 in the Honda Odyssey is to replace the catalytic ..., The P0420 generally means the downstream (post-cat) O2 sensor is not reading properly. That sensor should be pretty steady when the cat is doing its job. So if it fluctuates too much, as the upstream sensor properly does, it suggests a problem with the cat. It is known to be a flaky / possibly doubtful fault detection strategy., Bolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic - 110k miles - Bought brand new in August 2006, never any major repairs, possibly the most reliable Odyssey on the road ... I had a P0420 code in my old Subaru Forester. Tried the spacer method using a spark plug non-fouler which didn't work for me (but has worked for others). No pour in …, How to remove 2005Sensor location p0420 p0172 code o2 p0430 bank1 ridgeline locations honda sensor2 only 2008 rear mpg preventative maintenance located question P0430 code on 2010 honda pilotPersistant codes p0420 and p0430. 2008 honda odyssey touring P0430 code, bank 2 cat. Took out what I. Check Details, 1. Check Engine Light Illuminated. The most obvious and direct symptom associated with the P0420 code is the illumination of the "Check Engine" or "Service Engine Soon" light on your dashboard. 2. Reduced Fuel Efficiency. The catalytic converter plays a role in maintaining optimal engine performance., (RTTNews) - Honda, the world's largest motorcycle manufacturer, has announced its plans to launch electric motorcycles. Honda announced it would ... (RTTNews) - Honda, the world's..., A: The most common engine codes associated with Honda Odyssey vehicles include P0402 (Exhaust Gas Recirculation System Error), P0420 (Catalytic Converter Efficiency Error), P0700 (Transmission Control System Malfunction) and P0420 (Catalytic Converter Efficiency Error)., 1211 posts · Joined 2008. #3 · Mar 1, 2008. P0420 = Catalyst System Efficiency Below Threshold (Bank 1) I'm not 100%, I believe bank 1 is the cylinder bank to the front of the vehicle. That cat is between the engine and radiator. I've seen errant P0420-0430 codes pop up on brand-new vehicles after a steady hywy run., HELP! | Honda Odyssey Forum. 2000 Odyssey P420 code? HELP! 2000 Odyssey 60,000 is getting a P420. 1st the check engine light can on then went of after a week or so. I thought it had to due with the fuel cap. Then after a few days it came back on. Now my wife calls and says it is flashing maint required. She take it to a Midas dealer to have ...