Honda odyssey p0420 code

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.

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.Some possible causes for code P0420 in a Honda Accord include: 1. Faulty oxygen sensor: A malfunctioning oxygen sensor can provide inaccurate readings, leading to the P0420 code. 2. Catalytic converter issues: A failing or damaged catalytic converter may not be able to efficiently reduce emissions, triggering the code. 3.Some possible causes for code P0420 in a Honda Accord include: 1. Faulty oxygen sensor: A malfunctioning oxygen sensor can provide inaccurate readings, leading to the P0420 code. 2. Catalytic converter issues: A failing or damaged catalytic converter may not be able to efficiently reduce emissions, triggering the code. 3.Causes and fixes of a Honda with a P0443 Code, "Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction."Possible Causes of Honda Code P0443Gas ...Jun 9, 2005 · -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.Jun 23, 2022 · Check Engine Light and P0420 and P0430 Codes. So, your Check Engine light is on, and you’ve got either a P0420 or P0430 code, on your OBD-II scanner. This “Catalyst system efficiency below threshold” code is triggered when your car’s computer (the powertrain or engine control module (PCM or ECM)) detects a catalytic converter issue. 1A ...It took me another 3 days of tweaking to completely overcome codes P0420 and code P0139 "O2 Sensor Circuit Slow Response Bank 1 Sensor 2". After almost 200 miles test run without setting off any codes and with just 1 incomplete check for EVAP system, I passed the Emissions inspection. ... Bolt - 2006 Honda Odyssey - EX - Ocean Mist Metallic ...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 ...

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 ...A logged P0463 code means that a high voltage signal is detected from the fuel level sensor, resulting in inaccurate fuel gauge readings. A faulty fuel level sensor circuit or sending unit, damaged body computer, PCM issues, and a faulty smart fuse box are common reasons why this code is triggered. Aside from inaccurate fuel level readings, a ..."DO IT YOURSELF TIPS FOR THE MECHANICALLY INCLINED." Please do not do this DIY if you do not have a little experience in working on your own vehicles. CORRE...P0725 code. and tach not working on 1995 honda accord. because the tachTop 75+ imagen p0420 honda cr v P0420 code scanner toyota obd2 catalyst system 2008 obd camry scan bank efficiency threshold below codes fault dtc engine reading20) honda freed ecu keihin winols dtc off p0420 p0171 p0172 مسح وإلغاء.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.Honda Odyssey P0420 Code Symptoms. The P0420 code in a Honda Odyssey will often be thrown if one of your van’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.CEL light on 2000 Honda Odyssey..OBD code is P0420...my mechanic said that his plan would be to replace the (2) O2 sensors. When I look under the car, passenger front I see the one sensor right into t … read moreI have 2012 Honda Odyssey and recently have check engine line. As per the obdii scanner it says I have P2270 ( 02 sensor signal stuck lean bank 1 sens2 ) and P0137 02 Sensor Circuit Low Volts ( Bank 1 sensor 2 ) . ... Still the check engine line is showing same code. What could be the issue? Save Share. Like. Sort by Oldest first Oldest first ...

Dec 12, 2019 · 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.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.This forces your vehicles computer to make incorrect assumptions about what is going on with your vehicle. That is why the p0420/p0430 code can appear instead of the O2 sensor failure code (s). This partial O2 failure or "laziness", as some call it, can also account for the intermittent nature of the code and engine light.If you’re a car owner, there’s a good chance that at some point you’ve encountered the dreaded check engine light. Code P0420 is a generic diagnostic trouble code that indicates an...

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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 ...The P0420 code is generated when the secondary O2 senser is switching as often as the primary O2 senser meaning the catalytic converter is not doing it's job. ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less . Full Forum Listing.Mar 21, 2024 · 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.Good chance at this mileage that oil blow by from VCM has damaged your catalytic convertor. It may be worth just replace the O2 sensor down there, but decent chance your cat is shot.2010 Honda Odyssey EX-L - Driven in "Mexico" ... P0420 is a bank 1 cat code (rear bank.) You said the internals came out of bank 2 cat, which if bad would trigger a ...

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 ...Here is the process I used: 1. Run gas tank down to less than 1/2 full - closer to 1/3 full. 2. Pour in an entire gallon of lacquer thinner. You can buy these at Lowe’s for $21. 3. Good on a road trip and run the engine without stopping until it is very low on gas.Odyssey ALL ALL 2019 ALL 5FNRL6...KB000001 thru 5FNRL6...KB026674 2017-18 Pilot ALL ALL ... 20-100, Warranty Extension: MIL Comes On with DTC P0420/P0430, P030x, and/or P219A/B (With Software Update). SYMPTOM ... Code Symptom Code Template ID Failed Part Number 121110 Replace the fuelThe 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.Honda Odyssey Generation Forums. 2005 - 2010 Odyssey OBD II codes on an 05 odyssey. Jump to Latest ... Good morning everyone. I have had the check engine light on and off for about a year now and when scanned the code it gave was P0420. Now all of the sudden it is on all the time and the codes are P0420 and P0113.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.2016 Ody with P0420 and P0301 codes. Hi I am a noob here and hope I am posting in the right place. FYI, I have some car knowledge (do my oil changes, brakes and followed youtube videos to swap the sliding door mechanisms in our old Sienna) but I haven't touched the engine much. I am besides myself with our 2016 Ody.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.Honda Civic P0420 2008. Explained plus simple bypass.Honda Odyssey Generation Forums. 1999 - 2004 Odyssey

How To Fix The P0420 Trouble Code. Verify the code with an OBD-II scanner and reset the check engine light to see if it comes back. Inspect and replace faulty oxygen sensors. Check for exhaust leaks and repair as necessary. Replace worn-out spark plugs or spark plug wires.

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 ...2007 Honda Odyssey EX-L P0420 Code. Catalyst Efficiency BelowThreshold (Bank 1). The mileage of my van is 200,000. When they check the code they need to replace the o2 sensor. Then I've tried a second opinion from AutoZone and they advice me to replace Catalytic Converter (s) with new OE Catalytic Converter (s).1: Honda Odyssey Check Engine Light codes: Below is a detailed list of Honda Odyssey engine light codes: 1.1: Engine System Codes: The engine is the heart of your Honda Odyssey, and these codes relate to its performance and emissions. They include: P0100 – Mass or Volume Air Flow Circuit Malfunction: This code indicates a …Honda Odyssey; Honda Ridgeline; Honda ATV; Honda Element; About Us; Contact Us; P219A Honda − The Causes, Symptoms, and Solutions. By David Vallo Updated on July 13, 2023. ... DTC P219A code in Honda indicates that there is an air-fuel ratio imbalance in the engine bank one. Not only in Honda, but P219A is a general code that can be activated ...Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won't pass an emissions test. A bad catalytic converter isn't a hazard to the driver but it can overheat and destroy engine components.Wyoming and Montana have the most Superchargers per 1 Million People: Our Research; Norway has 18.7 times more EVs than US (per 1000 people). Our ResearchP0138 is a common OBDII code that occurs in many vehicles, including the Honda Odyssey. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause P0138.My conclusion is that the code retrieved from the computer is not a true code. p0420 is not always Catalytic Converter but a related issue. It has something to do with emission. Since after market Catlytic converter do not work on this model, CEL will come back on, it is good to spend $12 and try this solution before forking out $1100 to the dealer.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 ...

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Codes P0420, P0301, P2646. ... Hello 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 ...2001 Honda Odyssey P0420. ... Again the code came back Jan 2020 along with few other codes 3. Replaced 2 tires in preparation for state inspection 4. The car was due for the state inspection and failed due to codes 5 Replaced both O2 Sensors and code did not go away 6. Replaced Clutch Pressure Switch and which addressed other codes and P0420 ...The most common causes of code P0420 on late model Honda applications are engine vacuum leaks and fuel trim issues.Jul 7, 2020 · Most Honda Odyssey owners have a same experience with this P0420 code. It is bank 1, that on the rear side of the engineer. There are two o2 sensors. One of the top that connected to top or before the catalytic converter. This one can be replaced without go under your van. Another one is at the bottom where you have to go underneath.P0420 and P0430 issue. I have a 2011 Odyssey Touring Elite, recently bought from Virginia and now registered in NY. It has 105k miles on it. As I drove it along VA-PA-NY after picking up the vehicle, I noticed check-engine light turn on (it was 50 miles post-refueling on the way and after at least 300 miles total driving).Honda Odyssey Generation Forums. 2005 - 2010 Odyssey. 2005 Ody - Front Catalytic Converter Replacement - P0430 Code. Jump to Latest Follow ... The P0420/P0430 codes come up when the rear O2 sensor thinks the cat isn't working, i.e. the exhaust going in reads the same as the exhaust going out. ...Getting an error code P0420 on my honda odyssey 2005 ex-l. Check for a clogged or damaged catalytic connector. Need help - Answered by a verified Auto MechanicHonda Odyssey Generation Forums. 1999 - 2004 Odyssey. P0420. Jump to Latest Follow 2K views 2 ...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)Apr 19, 2010 · SOURCE: 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.DTC P0174: Front Bank (Bank 2) Fuel System Too Lean. Both codes can be from low fuel pressure, loose valve adjustment, or bad injectors. The fuel pressure needs to be verified first as well as the valve clearance as per the service manual. DTC P0420: Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) This means the rear bank ... ….

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 gas ...P0420 and P0430 issue. I have a 2011 Odyssey Touring Elite, recently bought from Virginia and now registered in NY. It has 105k miles on it. As I drove it along VA-PA-NY after picking up the vehicle, I noticed check-engine light turn on (it was 50 miles post-refueling on the way and after at least 300 miles total driving).Honda Odyssey Generation Forums. 2005 - 2010 Odyssey OBD II codes on an 05 odyssey. Jump to Latest ... Good morning everyone. I have had the check engine light on and off for about a year now and when scanned the code it gave was P0420. Now all of the sudden it is on all the time and the codes are P0420 and P0113.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). ... 2012 Honda Odyssey Touring Elite, Alabaster Silver - Family Hauler/My daily ride 2003 Accord EXV6, ...Honda Odyssey Generation Forums. 1999 - 2004 Odyssey. P0420 (cat code) and a snow bank. Jump to Latest Follow 2K views 4 ...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 …Honda Odyssey Generation Forums. 2005 - 2010 Odyssey. 2008 EXL + 200 Miles + P0420 ODB Code = WTF!? 1572 Views 7 Replies 5 Participants Last post by egads, May 4, 2008 Jump to Latest O. OceanMist08 Discussion starter · May 3, 2008. Add to quote; Share Only show this user ...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 ... Honda odyssey p0420 code, 2006 Honda Odyssey EX 3.5 - P0420. 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. ... Scan for codes and it has P0420. So, it needs a cat but I'm concerned that the elevated fuel trims, or whatever is causing them, ..., P0420 and P0430 issue. I have a 2011 Odyssey Touring Elite, recently bought from Virginia and now registered in NY. It has 105k miles on it. As I drove it along VA-PA-NY after picking up the vehicle, I noticed check-engine light turn on (it was 50 miles post-refueling on the way and after at least 300 miles total driving)., Explore our in-depth guide on the 'P3400 Honda - cylinder deactivation system bank 1'. Understand what the honda p3400 code means, how it affects your Honda Accord, and possible solutions. We have all the information you need on honda dtc p3400., 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., Dealer Locator. To locate the Dealer closest to you, go to state then go to city and reach to your nearest Dealer. State. City. Pin Code., 1999 Honda Civic EX 1.6L with p0420 code. Problem: MIL Lamp on (P0420) ... 2000 Honda Odyssey EX 3.5L: EGR replaced: 2015 Isuzu NPR-HD 5.2L Diesel: Exhaust injector: 2015 Ford Transit-350 HD XLT 3.2L Diesel: Exhaust injector: 2013 GMC Sierra 3500 HD SLE 6.6L Diesel: Exhaust injector: 1995 Subaru Legacy 2.2L:, P0420. Jump to Latest Follow ... Oh great, about 2k after the ring job I get this code. I already paid to replace the cat at 80kish (@122k) Would asking Honda to pay for a new cat even worth it? ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more. Show Less ., 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. …, 2000 Odyssey with P0420 code & nothing else! Save ... Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance ..., 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., DTC P0174: Front Bank (Bank 2) Fuel System Too Lean. Both codes can be from low fuel pressure, loose valve adjustment, or bad injectors. The fuel pressure needs to be verified first as well as the valve clearance as per the service manual. DTC P0420: Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) This means the rear bank ..., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code HONDA P0171 Saving Repa..., 2005 Honda Odyssey with trouble code po420 - Honda 2005 Odyssey question. Search Fixya. Browse Categories Answer Questions . 2005 Honda Odyssey; Honda Odyssey Car and Truck ... 2003 Honda Odyssey Code P0420 and related TCS Codes 31-2 / 61-1. Also recieved a note from dealer saying "This is AHM Position regarding P0740." They want to replace the ..., 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 …, The Honda Odyssey Code P0420 refers to a diagnostic trouble code that indicates a problem with the catalytic converter efficiency in the vehicle’s exhaust system. The code is commonly triggered when the catalytic converter is not working as effectively as it should be, resulting in increased emissions. This code indicates a potential issue ..., It's a long shot, but try adding 1 gallon of Lacquer Thinner to your slight less than 1/2 full gas tank... then drive about 100 miles with it... then clear the codes and see …, This page is meant to help you troubleshoot the Honda Odyssey 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 … See more, 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. …, P0420 Code Help. Tags 2008 accord 8th gen check engine light maintenance. Jump to Latest Follow ... 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, 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/, 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?, Honda Odyssey Generation Forums. 2005 - 2010 Odyssey EVAP 'not ready' Jump to Latest Follow ... Getting ready to sell my Ody and I had my mechanic replace the bank 1 cat (was throwing P0420 code previously) After installing the cat. I reset the computer, and luckily the new cat cured the P0420 code. However, after driving the car for about 5 ..., 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)., 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., My Honda Odyssey (year 2000 with 130,000 miles) check engine light came on. The code was P0420 which stated the catalytic converter efficiency issue. Is it necessary to replace the catalytic converter? Or, the problem can be solved by clean the oxygen sensor. Thanks. Tsai, 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., I have 2012 Honda Odyssey and recently have check engine line. As per the obdii scanner it says I have P2270 ( 02 sensor signal stuck lean bank 1 sens2 ) and P0137 02 Sensor Circuit Low Volts ( Bank 1 sensor 2 ) . ... Still the check engine line is showing same code. What could be the issue? Save Share. Like. Sort by Oldest first Oldest first ..., 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, SOURCE: 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., 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., P0420. This is a bank 1 catalyst below efficiency code. This is probably due to the failed A/F ratio sensor that has caused the rear bank to not run properly and possibly damaged the cat. I would repair the A/F ratio sensor first, clear the codes and see if the P0420 code returns. P3497., Honda Motorcycle & Scooter India Pvt. Ltd. (HMSI) is the wholly-owned subsidiary of Honda Motor Company, Japan - the World's No.1 two-wheeler company. Commencing its Indian 2Wheeler operations in May 2001, Honda in the last two decades has grown to become India's 2 nd largest two-wheeler company with over 60 million happy customers., 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...