I have a 2013 Honda Odyssey with 127K miles that recently got a check emission light that came on. I checked the code and only got a P0420... and no other co...5. Regular Maintenance: To prevent future occurrences of OBD Code P0420 or other issues, regular maintenance of your Honda Odyssey is crucial. Ensure you get regular emissions tests and smog checks. This not only ensures compliance with regulations but also helps in early detection of potential issues.Won't start - sounds like not getting gas - getting a P0420 code. Not great deal of change in mileage- had 60 degree - Answered by a verified Mechanic for Honda. ... Hello I have a 2012 Honda odyssey I have this codes P0420,P0430 is this catalytic converters?Won't start - sounds like not getting gas - getting a P0420 code. Not great deal of change in mileage- had 60 degree - Answered by a verified Mechanic for Honda. ... Hello I have a 2012 Honda odyssey I have this codes P0420,P0430 is this catalytic converters?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.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.Oct 27, 2004 · The P0420 code is set by the downstream O2 sensor. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance ...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/P0420 Honda Odyssey - 0 votes . ... Reset ECM to erase Code P0420, engine light came back on after driving 75 miles and stayed on. What may be causing this? Vehicle: 2001, Honda Odyssey 3.5 check-engine-light-on; p0420; 1 Answer. 0 votes . answered Jul 30, 2017 by anonymous. P0420 is for the catalytic converter not cleaning …May 8, 2024 ... 11:49. Go to channel · How To Clean Catalytic Converter▶️ P0420 P0430 Fix. RANDOMFIX•669K views · 8:42. Go to channel · Best Technique For ...Jul 4, 2020 · The P0420 code indicates a problem that may or may not be real. But it does not affect anything at all about how the engine runs. The only harm it can do is to cause you to fail a smog check, and to maybe miss another code that pops up while you are ignoring the check engine light. 2011 Odyssey LX, 136k miles.Feb 24, 2021 · Getting a p0420/0430 catalyst code. Was reset but comes back on. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service ...There are cases where an incompatible aftermarket air fuel ratio sensor can cause the code P0134. If the vehicle is California certified, it might need a special air fuel ratio sensor. Your dealer can verify the correct part number by your vehicle's VIN number. Replacing the air fuel ratio sensor ratio sensor may cost from $50 to $150 labor ...Diagnosis. Honda Element P0420 Quick Info Table. Honda Element P0420 OBDII Code Defined. P0420 is generic (has the same meaning for all vehicles made in …Dec 28, 2008 · N. Naim Discussion starter. 201 posts · Joined 2006. #1 · Dec 28, 2008. All of a sudden the 2000 Odyssey has been getting horrible gas mileage (300 miles per tank versus the 400 I was getting). The Check Engine light came on for a hundred miles then went away. I was able to scan the code and it was a P0420 code.Wes and Tanya take a road trip while running their car off a mix of 15 gallons of gas and 2 gallons lacquer thinner. The claim from Scotty Kilmer is that the...https://www.ktecgarage.comDiscord: https://discord.com/channels/1219270237908893779/1219270238420340777I will be using aftermarket direct fit parts from Dorm...-loss of 1-2 mpg when the P0420 or P0421 code was present-new upstream and downstream O2 sensors didn't appear to help much-EGR code P0401 eventually came up after having the simulator installed for about a month or 2 on my Odyssey. I used the TSB procedure to clean the EGR ports on the intake manifold as well as cleaning the …The term P0420 Honda is essentially a generic diagnostic trouble code (DTC) that translates to "Catalyst System Efficiency Below Threshold (Bank 1)". Put in simpler terms, it's the car's sophisticated way of saying that the catalytic converter isn't performing at its best. Now, for those who aren't car aficionados, the catalytic converter plays a pivotal role.My Service Records. Registered users can track all maintenance performed on their products by Honda dealers as well as keep a record of maintenance performed at non-Honda service facilities. A complete set of maintenance records allows you to stay up-to-date on your product's service history and can often significantly enhance your product ...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code HONDA P0430 Saving Repai...The O2 sensers are both monitored by the PCM and will generate codes if any of their conditions are out of spec. These can all be checkes with an OBDII scanner. Also most scanners will graph the sensers so you can see the eficiency. An article about the P0420 codes and checks to be made is at. 2004 EX Odyssey.P0420 Honda Odyssey - 0 votes . ... Reset ECM to erase Code P0420, engine light came back on after driving 75 miles and stayed on. What may be causing this? Vehicle: 2001, Honda Odyssey 3.5 check-engine-light-on; p0420; 1 Answer. 0 votes . answered Jul 30, 2017 by anonymous. P0420 is for the catalytic converter not cleaning …May 1, 2024 · Catalyst System Efficiency Below Threshold (Bank 1) is the meaning of the P0420 code. This code indicates that Catalyst System Efficiency (Bank 2) is below the threshold (P0430). The number one cylinder is located on the bank 1 side of the engine. In Bank 2, you will find the opposite side of the engine. P0420 and P0430 both showed up and are ...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.Customer brought me this 2001 Honda Odyssey to confirm if the Catalytic Converter was indeed bad, per Muffler Shop. In this Diagnosis I used three methods: S...Buddur. 591 posts · Joined 2015. #3 · Mar 22, 2020. I had a PO420 code in my old Subaru Forester and read about lacquer thinner helping clean the cat and eliminating the code, however based on other information about it can possibly affect the fuel system components I decided not to try it. Glad to hear it worked for you.Code p0420. 2005 SL here. Service light came on so I plugged in the scan tool and the P0420 code came up. Followed steps to check if the catalytic converter is the culprit. Monitored the O2B1S1 and O2B1S2 and noticed that sensor one sits at around .200 +/- .050 never going above 300. Sensor two sits from .600 to .800.I have a question. I have a 2010 Honda Accord EXL V6. my check engine light will come on, stay on for a day or so, then turn off. The codes that are on are P0420 (confirmed, and pending) and P0430 (conformed, pending, permanent). If I have to replace a cat, do you have any recommendations on after market brands or sites that are up to par but ...2010 Honda Odyssey EX-L; 160,000 miles; VCM is Muzzled (original VCMuzzler) Cleveland, Ohio USA. ... When I got the p0420 code at around 160k, it was the cat. (i ...The van (06 EXL w/245k miles) gets the following four codes for the past two weeks on a daily basis: P0420 (bank1) P0430 (bank 2) P0497 (evap sys low purge flow) P0457 (evap sys leak detected) Before inspection in June, the van showed P0430 and Fuel Cap Not closed message. I installed new two downstream sensors & one upstream (234-5010 air fuel ...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 …October 31, 2018 by Jason. P0141 is a very common OBDII code that occurs in the Honda Odyssey. It is caused by a failure in one of the elements that heat the oxygen sensors, specifically bank 1 sensor 2, which is downstream from the catalytic converter. It technically stands for:TSB for P0420 -- catalytic converter has deteriorated. I wanted to send a quick thanks to those who have posted so much information regarding the illusive P0420 code. I'm in the middle of battling this issue ('00 Odyssey 104k miles) and have found your insight invaluable when dealing with our local dealership.redmondjp. 538 posts · Joined 2008. #5 · May 1, 2013. It's sensors (plural) in this case - the secondary ones: Bank 1 Sensor 2, and Bank 2 Sensor 2. RIP: 2001 Odyssey EX 235K miles, 77K miles on the 1st transmission, 30K on the 2nd, 128K on the third (engine still ran great), Dextron III ATF with Lubegard Friction Modifier (black bottle ...This page is meant to help you troubleshoot the Chevy Suburban P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. …Related Honda Odyssey Honda Honda Cars and Motor Vehicles forward back. r/AskMechanics. r/AskMechanics. Members Online. P0420 and P0171 Codes on 2003 CorollaI got a requirement to get smogged in California on my 09 Honda Odyssey My check engine light shows error p0420 - Catalyst System Efficiency below…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.P0420 honda code fix P0369 code Persistant codes p0420 and p0430. Odyssey p0420. Honda odyssey 439b 9c19 a26cHonda pilot p0420 code Subaru impreza engine p0420 engines honda car odyssey code 2010 concept cylinder auto 5l forester brings la show diagnostic nowNeed help troubleshooting 2005 honda odyssey codes p0171/p0174 and p0420..P0138 is on bank 1 (Ody only has one bank) sensor 2 (sensor 1 is upstream at the Y-pipe and sensor 2 is downstream in the cat). High voltage usually means the sensor has worn out. It may not have shown up before because the P0420 was masking the problem, but that's just speculation. 1999 Odyssey LX 153k. 1999 Hyundai Elantra 184k.2015 Honda Odyssey P3400 Code 03 Feb 2024. Honda code p3497 p3400 fixed link below the description part (1-2 Honda oil switch odyssey 2008 vcm p3400 Honda p3400 codeHelp with P0420 code for 2001 Honda Odyssey . I inherited this 2001 Honda Odyssey from my parent's friend's dad. It was 142000 miles when I got it. I was impressed by ...Clearing the EGR passages on a Honda 3.5 with the p0401 code.Search Honda Odyssey Codes. Do you know the fault code already? Enter it in the box below and hit "Search Codes". Search Codes. ... P0420. Catalyst System Efficiency Below Threshold (Bank 1) Learn More Fixes. 4/10 P0455. System Gross Leak Evaporative Emission. Learn More Fixes. 8/10 P0301.Honda Odyssey Ownership. Problems and Concerns. P0420 Engine Code. Jump to Latest Follow 1 - 12 of 12 Posts. S. spearsall ...597 posts · Joined 2021. #4 · Mar 21, 2022. P0420 and P0430 just refers to bank 1 and bank 2. Bank 1 refers to the 3 cylinders in front of the car. Bank 2 refers to the 3 cylinders closest to the firewall. …While the OBD-II scanner can distinguish between a P0420 code and a P0430, it never hurts to double-check for issues that may cause a problem with the catalytic converter. ... This fix might also work for a P0430 on a Lexus GS300, a P0430 on a Toyota 4Runner, or a Honda Odyssey P0430. ... I just bought a 2005 Honda Pilot with 160,000 miles on it.Causes and fixes of a Honda with a P0443 Code, "Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction."Possible Causes of Honda Code P0443Gas ...Jan 12, 2023 ... ... catalytic converter on your 2011-2017 Honda Odyssey. Catalytic converters are an important part of a clean emissions system on your car or ...TSB for P0420 -- catalytic converter has deteriorated. I wanted to send a quick thanks to those who have posted so much information regarding the illusive P0420 code. I'm in the middle of battling this issue ('00 Odyssey 104k miles) and have found your insight invaluable when dealing with our local dealership.P0302 and P0306 misfire help on 2013 Odyssey. About a week ago while driving on the highway my 2013 Odyssey started running really rough, especially when accelerating in the high rpms. When I got it home I ran the codes and found a p0339 CKP sensor code as well as p0302 and p0306 misfire codes. I figured it was probably a bad CKP sensor and ...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.Hello - I stumbled upon this site while searching for answers for the codes P0303, P0420 & P0430 for my 2013 Odyssey with 175k miles on it. Had engine and traction light on. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less . Full Forum Listing.Honda Odyssey Generation Forums. 2011 - 2017 Odyssey. Help please... 2014 Odyssey with P0420 & P2096 codes. Jump to Latest Follow ... The P0420 code really can't be used to confirm a bad cat until the O2 sensor is working properly.-loss of 1-2 mpg when the P0420 or P0421 code was present-new upstream and downstream O2 sensors didn't appear to help much-EGR code P0401 eventually came up after having the simulator installed for about a month or 2 on my Odyssey. I used the TSB procedure to clean the EGR ports on the intake manifold as well as cleaning the egr valve itself.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.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. Can the Catalytic code P0420 be overridden permanently? ... This fix is generally for vans with only the P0420 code. If the O2 sensors were truly bad, they would also register a code. If you are only getting the P0420, the issue is probably in the cat, but even a small degradation in cat ...Honda Odyssey Generation Forums. 2011 - 2017 Odyssey. P0420 & P0430. Jump to Latest Follow 13K views 17 ... 50% chance they will solve your P0420/0430 codes but it's definiely worth trying. I just solved this for someone on a 2012 Nissan Altima.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 ...2005 Honda Odyssey Touring edition with 226826 on the odometer Hello again folks. I’m thinking about replacing one of my catalytic converters due to this code: P0430 (2/2) 1) Catalyst B2 deterioration 2) Catalyst B2 Below Threshold. I was getting this code before and I replaced an 02 sensor (the one closest to the engine) and it went away.One of the most common trouble codes with the Honda Odyssey is the P0496 code. This code number references a number that is given to you when you plug your Odyssey into an OBDII scanner. Below, you'll find the most common symptoms and ways to diagnose the P0496 in your Honda Odyssey. ... Related: P0420 Honda Odyssey . Honda Odyssey P0496 ...redmondjp. 538 posts · Joined 2008. #5 · May 1, 2013. It's sensors (plural) in this case - the secondary ones: Bank 1 Sensor 2, and Bank 2 Sensor 2. RIP: 2001 Odyssey EX 235K miles, 77K miles on the 1st transmission, 30K on the 2nd, 128K on the third (engine still ran great), Dextron III ATF with Lubegard Friction Modifier (black bottle ...6 posts · Joined 2023. #1 · 32m ago. Hey all. I have a 2007 honda pilot AWD with 250k miles and I have a P0420 and P0430 code since I bought the car. the car runs fine and been driving it for a about 10k miles now with it on but I want to fix it. I put cataclean in the tank and followed those directions but it didn't help.5 years 6 months ago #24757. 2006 Honda Odyssey EX 3.5 - P0420 was created by John Clark. Working on a 2006 Odyssey EX with the J35 (no VCM.) 160K on the clock and it has a P0420. That's the easy part. The harder part is the "why" it has a P0420. About 25K ago I put four O2 sensors in this car which solved a bit of what the customer called ...Great Video By My Daughter On The Process Of Changing Out Catalytic Converter On A 2012 Honda Odyssey V6 3.5 Code P0420Honda Odyssey Generation Forums. 2018+ Odyssey. 2018 Honda Odyssey Elite - P0420 - Emission System Problem. Tags emission system problem p0420. Jump to Latest ... Connected OBD2 and Cleared P0420 code. 4. Drove almost like 30 miles to office and the code didn't popup. 5. After the intiial drive, i saw voltage on B1 O2 sensor getting much better ...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 ...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. Pending P0430 (Catalyst System Efficiency Below Threshold) Jump to Latest Follow ... I was successful in temporarily get rid of P0420 code using chevron Techron fuel system concentrate for about 1- 2 years. Every time I does my tank with it (1 oz / gal gas), the code goes away …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.Honda Odyssey Generation Forums. 1999 - 2004 Odyssey. P0420 Code. 20051 Views 41 Replies 15 Participants Last post by POSGUY, Mar 28, 2011 Jump to Latest M ...The following is from the Honda Odyssey (1999-2004) Service Manual page 19-81: "When the Malfunction Indicator Light (MIL or check engine light) and the Traction Control System (TCS) light are both on at the same time, you should troubleshoot the Programmed Fuel Injection (PGM-FI) system first."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.P0420 & p0430. Tags ... We have a 2013 with 113k and for the last year and a half we have been occasionally having one of these codes. Check engine light would come on and go off on its own. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less .How to fix obd code p0430 on a honda odysseyP0420 ford f150 bank 1 Q&a: 2012 honda odyssey p0420(honda odyssey) diagnosing a p0420 by using 3 methods. How To Fix OBD Code P0420 On A Honda Odyssey - Car Tire Reviews. Check Details. 2012 honda pilot p0430. 2008 honda odyssey touring p0430 code, bank 2 cat. took out what iOdyssey p0420 2012 honda ...Honda Odyssey Generation Forums. 2005 - 2010 Odyssey Spark Plug Explosion, P0420 and P2647 Code. Jump ... The codes were P2647 and P0420. My husband drove the vehicle back to the garage (another 150 miles). This time he replaced the rear catalytic converter and gaskets.Feb 12, 2021 ... This 2005 Honda Odyssey marks the return of Fixing it Forward to my channel. This time, instead of fixing up an existing vehicle, ...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 ... for the cats, luckily, i didn't got any P0420 or P0430 codes yet and the infra thermos gun showed okey data, but I can't stop thinking how long the Cat would hold up and ...Jul 27, 2023 ... In this video, I'll guide you through the step-by-step process of diagnosing the P0171 and P0174 Diagnostic Trouble Codes (DTC's) on your ...Lack of throttle response plus P0420. Whats up ppl. Yes I did search the forums in regards of this code. 2003 odyssey 225 miles on the clock. Suggestions on what to try next to see if I can find the fix for the lack of throttle response while accelerating. If I pedal it it will get going but it trigger code for upper 02 sensor alone with ...John Clark. P0430 indicates a bad catalytic converter, not necessarily a bad O2 sensor. However, sometimes replacing the O2's will give you some time before having to replace it. I always start with a new O2 since, if you end up replacing the cat, you'll want new O2's anyway and, it sometimes resolves the cat code without replacing the cat.Customer brought me this 2001 Honda Odyssey to confirm if the Catalytic Converter was indeed bad, per Muffler Shop. In this Diagnosis I used three methods: S...misfiring can cause a P0420 code. I would recommend a set of honda plug wires and plugs if the P0420 code returns. I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.Dec 21, 2016 ... How to fix code P0420 or lack of acceleration on Honda CR-V and other make and models. See more info below about what is causing code P0420 ...Honda Odyssey Generation Forums. 1999 - 2004 Odyssey. P0420 (cat code) and a snow bank. Jump to Latest Follow 2K views 4 ...#1 · Feb 8, 2009. Anybody know what this is as i am getting confusing diagnostic advice as to what this is , some say cat and some say 02 sensor. Code is P0420 catlatic system …460 posts · Joined 2005. #1 · Nov 7, 2008. At least I hope! The symptoms were the P0420 code on our 1999 Odyssey. I would read the code and then erase it with the code reader. This started a couple years ago and it would take a while (hundreds of miles) for the code to show up again. But more recently the code would show up within minutes ...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 ...Honda Odyssey Generation Forums. 2011 - 2017 Odyssey. Help please... 2014 Odyssey with P0420 & P2096 codes. Jump to Latest Follow ... The P0420 code really can't be used to confirm a bad cat until the O2 sensor is working properly.Honda Odyssey Generation Forums. 2005 - 2010 Odyssey. Pending P0430 (Catalyst System Efficiency Below Threshold) Jump to Latest Follow ... I was successful in temporarily get rid of P0420 code using chevron Techron fuel system concentrate for about 1- 2 years. Every time I does my tank with it (1 oz / gal gas), the code goes away …Got a P0303 on my 2010 Honda Odyssey with 184,000 miles. Oil consumption test i, At approximately 145K miles I again received persistent CEL with a code of P0420. Again, no additional co, P0420 is the rear bank which is considered Bank 1. (pg 11-10 of the 06' shop ma, I just bought a used 2006 Honda Odyssey and about a week ago the "MALFUNCTIONINDICATORLAMP" light came , 2016 Ody with P0420 and P0301 codes. Hi I am a noob here and , The P0420 engine code indicates the catalyst system efficiency is below the threshold, Learn everything about the P0420 Honda code, also known as Honda P0420. Our detailed guide explai, https://www.ktecgarage.comDiscord: https://discord.com/cha, I'm working on my 08 odyssey (j35a7 engine) and I'm gett, Videos are for Knowledge & Entertainment purposes only. D, How to fix obd code p0420 on a honda odysseyI have a 2005 honda odyss, Honda Odyssey Generation Forums. 2005 - 2010 Odyss, 2003 Honda Odyssey Code P0420 and related TCS Codes 31-2 / 61-1, Aug 24, 2020 · 56 posts · Joined 2018. #4 · Aug 25, 2, How to diagnose DTC P0430 on a Honda Odyssey: This trouble cod, P0420 on 2005 Ody w/130k miles. This code had been coming on and off , P0420 is a bank 1 cat code (rear bank.) You said the internals came , This trouble code references a number that is given to you w.