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Step 2 - Remove bolts on front and rear flanges. The catalytic converter is bolted in series with the rest of the exhaust system. Using your wrench and ratchet, remove the five bolts that hold the front and rear flanges together. Once it is unbolted, it can be taken down. Figure 2.Catalytic converter cleaner. How to clean catalytic converter DIY with Scotty Kilmer. Catalytic converter clogged and problem code P0420. How to fix and repa...2004 Accord 2.4 175k P0420 code came back on after replacing sensor 1 and 2, new cat, plugs, air filter, oil, pcv - Answered by a verified Mechanic for HondaThe PO171 code in your Honda Accord indicates a problem with the fuel system running too lean. To diagnose and fix this issue, you can start by checking for vacuum leaks, inspecting the air filter, and ensuring proper fuel pressure. If necessary, clean or replace the oxygen sensors and examine the fuel injectors. If you're unsure or unable to ...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.Hi, I am using Honda Accord 2011 - V6, I got check Engine light on my dashboard, when checked the fault code, I got P0420 (Catalyst System Efficiency Below Threshold Bank 1). I went to a mechanic and he ran some tests, then on Charging Test it showed Excessive Ripple (Volts 12.65 V) and then suggested me to get my alternator changed.Per the Honda Service Manual: 1. "Poor quality fuel may cause this DTC [P0420]". Probably it is unlikely, but you may want to drive for a while (a few tanks of gas) and make sure that the check engine light is still on. Also, it could be that the catalytic converter is marginal and the CEL is intermittent.John Clark. This is just not true. The P0420 code is the one code that almost always means exactly what it says. Yes, one should check the functionality of the A/F sensors and the rear O2 sensor but just due to what the computer needs to see in order to set a P0420 or P0430 code it usually is NOT the sensors.Te suministramos todo lo que necesitas saber sobre el código DTC P0420: ️ Descripción, ️ causas, ️ síntomas y ️ posibles soluciones.LEER SOLUCIÓN DEL CÓD...4/2/18: OBD2 - confirmed: P0420 - Catalyst System Efficiency Below Threshold Bank 1 & P2096 - Post Catalyst Fuel Trim System Too Lean Bank 1. OBD2 - pending: P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) & P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1. OBD2 - permanent: P0420 - Catalyst System ...Autozone read the code for free and each time resulted in "P0420 Catalyst System Efficiency Below Threshold B1". It was an infrequent, intermittent issue and gradually became more prevalent. I tried this forum's spark plug spacer idea and installed it two weeks ago. ... Victus - 2012 Honda Accord - EX-L V6 - Crystal Black Pearl - 39k miles ...Usually P0420 means the secondary 02 is showing too much voltage, not too little. The cat is supposed to clean the exhaust up enough that the voltage on the secondary 02 is fairly constant with some slight variations. When the cat wears out, the secondary 02 starts to read the same as the primary.The P0420 code is for the converter efficiency which is measured by the downstream O2 sensor. If the upstream sensor is not working properly is should set other codes. ... Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. Show Less . Full Forum Listing. Explore Our Forums.Per the Honda Service Manual: 1. "Poor quality fuel may cause this DTC [P0420]". Probably it is unlikely, but you may want to drive for a while (a few tanks of gas) and make sure that the check engine light is still on. Also, it could be that the catalytic converter is marginal and the CEL is intermittent.20009 posts · Joined 2003. #4 · Mar 1, 2008. For DTC P0172, look for a stuck open EGR valve, tight valves, incorrect camshaft timing, low. compression, or leaking fuel injectors. For a V6: P0420: There's an article in the service news. This may also help.Per the Honda Service Manual: 1. "Poor quality fuel may cause this DTC [P0420]". Probably it is unlikely, but you may want to drive for a while (a few tanks of gas) and make sure that the check engine light is still on. Also, it could be that the catalytic converter is marginal and the CEL is intermittent.I have a 2003 Honda Accord showing engine malfunction codes P0420 andCheck air cleaner element. Check coolant level. Check Overview of how to fix a Honda with a P0420 Code: "Catalyst System Efficiency Below Threshold (Bank 1)."Possible Causes of a Honda P0420 CodeFailed catalytic... Especially because the P1456 code has been on and off 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.CEL Code P0420 This code occurs when the secondary O2 sensor is reading too much exhaust gases. The solution would be to remove the O2 sensor, loosen the lock nut and turn the defouler out 2 turns. Reset ECU. CEL Code P0139 This code occurs when the secondary O2 sensor is not reading enough exhaust gasses. The solution would be … Aug 7, 2014 · greg1c. 5852 posts · Joined 2013. #5 · Aug 9, 2

Had trouble code p1259 and P0420. Replaced Vtec solenoid and still have p1259. Followed all the steps in troubleshooting VTech solenoid and electrical system and found I have 14.5 volts at oil pressure switch all the time. ... Hi i have a 2001 honda accord lx and changed the MAP sensor, idle cintrol sensor, intake air temp sensor and last but ...P0420 - Catalyst System Efficiency Below Threshold (Bank 1) Indicates Bank 1 catalyst system efficiency is below the acceptable threshold. ... Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. Show Less . Full Forum Listing.May 13, 2017 ... This 2000 Honda Accord EX 4 Cylinder VTEC with 305000 miles is due for Inspection. But there are 4 diagnostic trouble codes setting off the ...Car: 2007 Honda Accord SE 2.4 Inline-4 5-speed manual I got check engine light. I used the OBD-II tool to diagnose. I got code P0420. This could be mean: Gas cap not tightened properly Bad Oxygen Sensor Bad Catalytic Converter I checked the gas cap. It was tight and good. I looked at the live graph of the O2 Sensor Bank 2 Sensor 1 Voltage to ...If your car is showing the P0420 engine code, it's likely that either the catalytic converter or the O2 sensors aren't functioning properly. A faulty catalytic converter is the most common cause of this engine code. The catalytic converter is a small cylinder that lives in your car's exhaust system. It uses a fine metallic honeycomb ...

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 ...P0420 check engine light Hi I have a 2001 Honda accord that has had the check engine light come on 5 times in the past 5 months. First it was a temeperature gauge (had that replaced), next it was an O2 sensor (had that replaced) now I'm getting a P0420 code and the mechanic recommended I replace the cat converter. I said I was going to wait 2 ...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 ...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. 3.Turn the ignition switch ON (II), and wait 2 seconds . 4.Sta. Possible cause: However, after resetting the codes and driving it for a little while, the CEL came on agai.