P0420 acura. I own 2007 Acura MDX. I have P0420 and P0430 DTC. I hookup with ODB...

We took our 2005 Acura MDX in to dealer & got the re

When the ECU detects a lower boost than what’s considered in the normal range, it will set the P0299 DTC. This code causes the Check Engine Light to come on, indicating that there’s a problem. When a turbo or supercharger is operating normally, the air going to the motor is pressurized. It’s how the engine can output more power for its size.Related P0420 Content. Code P0420. 97 Acura Cl 2.2 120k Miles The Code Indiacates Catalyst System Efficiency Below Threshold Bank (1) Any Idea On How To Correct.This page is meant to help you troubleshoot the Acura CL 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. Table of Contents. Quick ...I compared lice data from my 2012 mdx that has no light on to my 2005 mdx and the only difference I’d bank 2 sensor 2 doesn’t move much during driving stays around 0.400vokts... P0420 and P0430 are both downstream codes for "below efficiency" cat performance. P0420 for bank 1 (back side of the motor) and P0430 for bank 2 (front side).Once you know what’s causing the problem, you can get it fixed. Here are some of the most common fixes to the P0404 trouble code. Repair electrical short in circuit or ground. Clean EGR Valve or pipes. Replace EGR valve/sensor. Update/replace PCM. Repair intake leak. Replace MAF/MAP sensor.Code p0420 acura m'dx. 1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and …The catalytic converter is part of the exhaust system in Acura TL and its main purpose is to convert exhaust gases like carbon monoxide and hydrocarbons that are harmful to health and the environment into less harmful byproducts, like carbon dioxide and nitrogen gas. ... If you see any fault code from P0420 to P0424 or from P0430 to P0434 …I own 2007 Acura MDX. I have P0420 and P0430 DTC. I hookup with ODB2 scaner and did live param testing and trigger frame record. I shows that on the trigger frame EVAP system pressure dropping from 15000 to almost 0. Is it possible that during purging fuel vapors P0420 and P0430 getting triggered. What can couse it? Thanks for helpIn this video, we're going to show you a quick and easy way to fix your P0420 without having to replace your catalytic converter. This is a quick and easy fi...1 jefferson88 · #4 · Jan 31, 2021 If you are under 4 years/50,000 miles your emissions system is still covered under Acura warranty. If you are in California, …You also have to understand that to condemn a catalytic converter, the ECM uses readings from the O2 sensor. If the sensors were bad, it couldn’t set the P0420. Let’s understand exactly what a P0420 code is. Here’s the definition: P0420 Catalyst System Efficiency Below Threshold (Bank 1).P1420 Acura 1,671 Views. NOx Adsorptive Catalyst System Efficiency Below Threshold. P0420 Acura 📷 110,041 Views. Catalyst System Efficiency Below Threshold. P0420 Audi 📷 76,424 Views. Catalyst System Efficiency Below Threshold Bank 1. P1420 Audi 3,777 Views. Secondary Air Injection Control Module Electrical Malfunction.P0420 means that the bank 1 catalytic converter (In the exhaust system) has failed and needs replacing. If you can post the Year/Model/Engine size for the Acura, or preferably the VIN number, I can provide you with a rough estimate for the repairAug 18, 2023 · Code P0420 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. Jan 20, 2014 · code p0420 acura m'dx - Acura 2005 MDX question. OK, If I understand your question correctly, Your Check Engine light is coming on and you are getting a Diagnostic Trouble Code (DTC) P0240 and we are talking about a 2000 Honda Civic DX with a 1.6L engine? Causes of the P0134 Code. The most obvious cause of the P0134 code is that the oxygen sensor has failed. However, the code can also be initiated because of other issues that are normally related to the oxygen sensor. Here are a few causes to consider. Bad O2 sensor.The two downstream (of cat) O2 sensors indicate performance of catalytic converter. P0420 is fault for rear (bank 1) cat and your bank1 O2 voltage has numerous voltage swings. Also your scanner is likely missing some voltage swings and peak values due to long update time step. It appears to be consistent w/ P0420 code.Mar 3, 2011 · Hanuman01mdx · #2 · Mar 13, 2011. code p0420 is usually the cat but also the 02 sensor i had that code and turn out it was the cat. but i also started with the 02 first to make sure. Reply. Save. M. mantovar Discussion starter · #3 · Mar 13, 2011. P04020. After Acura delar and a private shop told me it was def the cat, because of the miles ... if you ever get this code in almost any car and you don't want to spend hundreds of dollars replacing the catalytic converter on your car, chances are you ca...A P0420 plus a P0430 indicates a new catalytic converter is necessary. Catalyst System Efficiency Below Threshold (Bank 1) is the meaning of the P0420 code. This code indicates that Catalyst System …P0420 indicates a problem with the cat or the 2nd HO2 sensor. If you haven't replaced the sensor, do that first since the sensor is much cheaper than a new cat. If the …Here are the most common P0128 fixes: Replace thermostat. Add engine coolant. Replace cooling fan. Repair/replace wiring or connector. Replace coolant temperature (ECT) sensor. Replace the intake air temperature (IAT) sensor. RELATED: 6 Causes of a Cold Lower Radiator Hose (& How to Fix it )Jul 1, 2011 · The P0420 code is a very popular one and that's why there's a site dedicated to that specific trouble code. If your car's check engine light is on, get that code read in case it's a P0420. A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles from 1996-newer sold in North America support this generic powertrain code. 13 sept 2023 ... Find out what a P0420 code means, how to diagnose this problem and the common fixes that you can do to resolve this trouble code.P0420 acura - mdx. 0 votes . 965 views. asked Aug 7, 2016 by anonymous. I have acura 03 mdx ,getting codes P2413 and P0420 ( low bank 1) what is wrongCommon Acura service codes include letter A codes such as A, A1, A2, A3 A4, A5 and A6 and letter B codes such as B, B1, B2, B3, B4, B5 and B6. The Acura maintenance minder displays the codes to alert the driver when the car is due for servi...I recently dumped a bottle of SeaFoam into a full tank of gasoline (as recommended by product) within about 2 weeks of driving, P0420 code pops up (2007 Acura MDX Sport). Same thing happened with my 04 CRV. Each vehicle has between 160,000 to 180,000 miles. Also put SeaFoam in the Honda. Now the check engine light is on permanently with my CRV ...This page is meant to help you troubleshoot the Acura MDX P0430 trouble code. It covers the P0430 code's meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of ContentsWhat is the Cost to Diagnose the Code P0430 Acura? Labor: 1.0. The cost to diagnose the P0430 Acura code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.Acura RL P0420 OBDII Code Defined P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here's the technical definition for your car: P0420: Catalyst System Efficiency Below Threshold (Bank 1) Catalyst System Efficiency Your RL's exhaust contains hydrocarbons, carbon monoxide, and other harmful gasses.Code p0420 acura m'dx 1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream).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.When To Expect These Codes With Your Acura MDX. We’ve scanned millions of cars so we know at what mileage these common problems usually show up. Sometimes they happen sooner than expected or not at all, but these problems usually appear by the following mileages: P0420 usually appears after 174996 miles; P0300 usually appears after 166383 milesJan 7, 2019 · 2011 Honda Truck Pilot 2WD V6-3.5L DTC Troubleshooting Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0420 DTC Troubleshooting DTC TROUBLESHOOTING DTC Troubleshooting: P0420, P0430. DTC P0420: Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) DTC P0430: Jan 9, 2015 · I recently dumped a bottle of SeaFoam into a full tank of gasoline (as recommended by product) within about 2 weeks of driving, P0420 code pops up (2007 Acura MDX Sport). Same thing happened with my 04 CRV. Each vehicle has between 160,000 to 180,000 miles. Also put SeaFoam in the Honda. Now the check engine light is on permanently with my CRV ... Jan 14, 2018 · Receiving engine code p0420 on my 2005 altima 2.5 s. A p0420 code indicates a Catalytic System efficiency failure, Bank 1. Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor) There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature ... Mar 21, 2007 · Check Engine Light P0420 OBDII Code. My check engine light turned "On" on my Acura TL 2002. I took it to the dealer and he said he replaced my Catylitic Converter with a used one. I drove away and the next day the check engine light came back on. PEP Boys told me that the OBD II code was P0420. Save. Nick_CL9 · #8 · Feb 16, 2015. P0420 isn't even an oxygen sensor code, it is a catalyst efficiency code. If you were to get a P0135 then it would be o2 related but it isn't in this case. Fix it right the first time and be done with it.98 explorer codes p0420, p0174 Hello. 98 explorer with code P0420(catalyst system efficiency below threshold)(Bank1) and P0174 (System too lean)(Bank2) The explorer idles very rough in cold weather, dont want to stay running until it warms up. Also you hear it almost like misfiring every 30 seconds, it its more of a tick, an...Subject: Malfunction Indicator Lamp (MIL) Illuminated, DTC P0420 Set Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Buick Encore 2013 2015 All All Chevrolet Trax 2013 2015 Involved Region or Country North America and N.A. Export Regions Condition Some customers may comment that the MIL is on/illuminated and DTC P0420 …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...Acura RL P0420 OBDII Code Defined P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here’s the technical …The 1st sensor is located closest to the engine, and the last is located toward the rear of the exhaust system. Generally, if we are talking about O2 sensors: Sensor 1 = Before Catalytic converter Front (Upstream O2 sensor) Sensor 2 = After Catalytic Converter Rear (Downstream O2 sensor) Some diesel engines have many exhaust temperature …Diagnose Difficulty of Inspecting Get Additional Help The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired …The CEL comes on and off, it has been off for a long time for about 3 months and yesterday just came back on. there was 4 things that could be faulty.. 1: A/F Ratio Concern. 2: Air leak near H02S (Heated Oxygen Sensor) Bank 1. 3: Ignition System Concern. 4: Faulty Catalytic Converter.Code p0420 acura m'dx 1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream).I have an 04 TSX that was showing a P0420 - Catalyst System Efficiency Below Threshold Bank 1 and the check engine light was on. I tried to pass smog and it …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 else. The catalytic converter is the last stop for the exhaust gasses generated by the engine during …How to fix P0420 clogged catalytic converter on Acura MDX.Wasy fix with Scotty Kilmer trick.Brewgod23 Discussion starter · Mar 21, 2007. My check engine light turned "On" on my Acura TL 2002. I took it to the dealer and he said he replaced my Catylitic Converter with a used one. I drove away and the next day the check engine light came back on. PEP Boys told me that the OBD II code was P0420.The P0325 DTC is a generic powertrain fault that indicates a malfunction with the knock sensor circuit (sensor 1 on bank 1). The Powertrain Control Module ( PCM) recognizes a problem with the circuit or knock sensor and sets the code. This sensor is found on the side of the engine with cylinder #1.Acura automobile dealer. January 18, 2014 14-002 Applies To: SeeVEHICLES AFFECTED MIL Is OnWith DTC P0420 or P0430 SYMPTOM The MIL is on with DTC P0420 or DTC P0430 (catalyst system efficiency below threshold) with a possible DTC P2243 or DTC P2247 (A/F sensor 1 circuit high voltage). POSSIBLE CAUSE One or both primary A/F …The P0449 code is, in most cases, caused by a faulty EVAP vent valve or the wirings to it. However, depending on the car model, it could also be caused by other issues related to the EVAP system. The causes of the P0449 trouble code range from simple to more complex. For this reason, it’s important to follow the diagnostic steps we provide ...New Member. Dec 4, 2011. #2. if you dont have any other code but the P0420 CATALYST EFFICIENCY BELOW THRESHOLD replace the cat only way to fix it unless you buy an 02 simulator and for your maint light turn the key to the on pos, and under the dash on the driverside ull feel a box with a botton on the right side push and hold for 10 sec …Catalyst System Efficiency Bank 1. P0420 KIA 📷 98,415 Views. Warm Up Catalyst Efficiency Below Threshold Bank 1. P0420 Lexus 📷 106,721 Views. Catalyst System Efficiency Below Threshold Bank 1. P0420 Mazda 📷 93,413 Views. Catalyst System Efficiency Below Threshold Bank 1. P0420 Mercedes-Benz 54,941 Views.P0420 indicates a problem with the cat or the 2nd HO2 sensor. If you haven't replaced the sensor, do that first since the sensor is much cheaper than a new cat. If the …98 explorer codes p0420, p0174 Hello. 98 explorer with code P0420(catalyst system efficiency below threshold)(Bank1) and P0174 (System too lean)(Bank2) The explorer idles very rough in cold weather, dont want to stay running until it warms up. Also you hear it almost like misfiring every 30 seconds, it its more of a tick, an...P0420 acura - mdx. 0 votes . 965 views. asked Aug 7, 2016 by anonymous. I have acura 03 mdx ,getting codes P2413 and P0420 ( low bank 1) what is wrong. 1 Answer. 0 votes . answered Aug 20, 2018 by Carguy1 (12.6k points) Hi there, Trouble code P2413 indicates there is an issue with the egr. This actually could be due to the P0420 catalityc …• If none of the cylinders have failed, continue troubleshooting for DTC P0420 Catalyst System Efficiency Below Threshold and do not replace the fuel injector set. END Page 10 of 10. Title: Warranty Extension: MIL Comes On With DTC P0300, P0301, P0302,P0303, P0304, P0171, P0172, P219A, P0420, or P0420 With Any of the Other Listed CodesShadowWood · #4 · Mar 18, 2020 Hello, hope you are well aside from dealing with this! I have a few thoughts! If the ECU was not reset fully after the O2 sensor and cat replacement, it will hang on to stored values and could be contributing to your issue. There are two ways I like to reset an ECU: quick and dirty, or an overnight sit.Save. Nick_CL9 · #8 · Feb 16, 2015. P0420 isn't even an oxygen sensor code, it is a catalyst efficiency code. If you were to get a P0135 then it would be o2 related but it isn't in this case. Fix it right the first time and be done with it.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Related: P0420 Acura CL. Acura CL P0401 Symptoms. Most of the time, there will not be symptoms associated with P0401 in the Acura CL. There may be a slight ping or knocking sound on rare occasions. Service Engine Soon Light– P0401 will illuminate the service engine soon light.Acura. Acura repair questions? Ask a mechanic for answers ASAP. Connect one-on-one with {0} who will answer your question. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Ask an Expert;TLX Forums is the premier owner’s club community for everything related to the Acura TLX. Let’s chat Honda interior, mods, and more! Full Forum Listing. Explore Our Forums. Acura TLX General Discussion Forum Electronics, Audio, and Lighting 2021 + Acura TLX Forum Engine and Technical Discussion New Member Introductions.2007 MDX Tech DIY performed: Fluid change: engine oil, ATF, transfer case, rear diff, PS, brake, coolant. Parts R&R: air filters, both AFR sensors, spark plugs, oil pressure switch, radiator, drive belt & tensioner, sway bar end links and bushings, brake pads, TPMS sensors, low beam and DRL bulbs, wiper inserts, hood struts, spark plug tube ...Causes Diagnosis Acura Integra P0420 Quick Info Table Acura Integra P0420 OBDII Code Defined P0420 is generic (has the same meaning for all vehicles …Save. 964doorgeezer · #16 · Nov 18, 2010. 1fastautoteggy on Nov/18/10 said: the po420 code means the car is reading that the exhaust between the upstream sensor to the downstream is not "clean enough". id start of wit the downstream sensor 1st. thats what i did wit my civic. and 30k miles no codes yet.Catalyst System Efficiency Bank 1. P0420 KIA 📷 98,415 Views. Warm Up Catalyst Efficiency Below Threshold Bank 1. P0420 Lexus 📷 106,721 Views. Catalyst System Efficiency Below Threshold Bank 1. P0420 Mazda 📷 93,413 Views. Catalyst System Efficiency Below Threshold Bank 1. P0420 Mercedes-Benz 54,941 Views.The Acura Car TLX is a luxury car that combines performance, style, and comfort. It is the perfect car for those who want to experience the best of all worlds. The Acura Car TLX has a powerful engine that provides an exhilarating driving ex...Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good …The most common fix for P0430 in the Acura MDX is a new catalytic converter, followed by replacing the Oxygen sensor. Before taking your MDX into an exhaust shop for a new catalytic converter, let’s ensure that’s what you need. Here’s a good P0430 diagnostic order for the Acura MDX: 1. Check for Other Codes.Common Acura service codes include letter A codes such as A, A1, A2, A3 A4, A5 and A6 and letter B codes such as B, B1, B2, B3, B4, B5 and B6. The Acura maintenance minder displays the codes to alert the driver when the car is due for servi...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Common Acura service codes include letter A codes such as A, A1, A2, A3 A4, A5 and A6 and letter B codes such as B, B1, B2, B3, B4, B5 and B6. The Acura maintenance minder displays the codes to alert the driver when the car is due for servi...6 dic 2022 ... I was hoping they would do more or replace something since Google shows lots of Acura and Honda owners hitting these same two warnings at the ...I was getting a P0420 and a P0299 on my Acura RDX. My 2nd Cat had failed. This was the fix.New Member. Dec 4, 2011. #2. if you dont have any other code but the P0420 CATALYST EFFICIENCY BELOW THRESHOLD replace the cat only way to fix it unless you buy an 02 simulator and for your maint light turn the key to the on pos, and under the dash on the driverside ull feel a box with a botton on the right side push and hold for 10 sec …I recently dumped a bottle of SeaFoam into a full tank of gasoline (as recommended by product) within about 2 weeks of driving, P0420 code pops up (2007 Acura MDX Sport). Same thing happened with my 04 CRV. Each vehicle has between 160,000 to 180,000 miles. Also put SeaFoam in the Honda. Now the check engine light is on permanently with my CRV ...The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency of the catalytic converter on Bank 1. This could be attributed to a malfunctioning catalyst or potentially be a false alarm triggered by a defective O2 sensor.Dec 23, 2018 · This page is meant to help you troubleshoot the Acura RDX P0430 trouble code. It covers the P0430 code's meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of Contents Aug 6, 2014 · This is the problem with transmission code diagnosis. You try to fix the easy stuff then find out it needs a new transmission. With the new code information I would say it's 50-50 if the solenoid will fix it. Honda/Acura info sent to the dealer some years ago says don't replace solenoids When mileage is above 30k. The Acura Car TLX is a luxury car that combines performance, style, and comfort. It is the perfect car for those who want to experience the best of all worlds. The Acura Car TLX has a powerful engine that provides an exhilarating driving ex...Acura RL P0420 OBDII Code Defined P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here's the technical definition for your car: P0420: Catalyst System Efficiency Below Threshold (Bank 1) Catalyst System Efficiency Your RL's exhaust contains hydrocarbons, carbon monoxide, and other harmful gasses.Next, a scan tool check. First to verify the presence of the P0420 and/or P0430 DTCs but to also check for any others that might be recorded in the ECM. Any DTC or condition that increases emissions or affects sensor readings can cause a converter to fail the ECM tests even if the converter is good.Dec 6, 2022 · Location. maryland. 6 December 2022. #2. midget fidger said: Just a few minutes after starting the car and hitting the highway, I got simultaneous warnings on the dash. Emissions System Problem and Electronic Parking Brake Problem. Dealer said it had a P0420 code for the catalytic converter. The car is under warranty, but due to the aftermarket ... The code P0420 stands for Catalyst System Efficiency Below Threshold. This means that the oxygen sensors in your exhaust system have detected that the catalytic converter is not working as efficiently as it should. ... I spent a few years in aviation manufacturing after 34 years in the Acura and Honda repair field.Acura automobile dealer. January 18, 2014 14-002 Applies To: SeeVEHICLES AFFECTED MIL Is OnWith DTC P0420 or P0430 SYMPTOM The MIL is on with DTC P0420 or DTC P0430 (catalyst system efficiency below threshold) with a possible DTC P2243 or DTC P2247 (A/F sensor 1 circuit high voltage). POSSIBLE CAUSE One or both primary A/F Sensor (Air Fuel ...My 2004 MDX with 249k miles had the following codes P0171, P2195 and P0420 and was getting poor gas mileage. I replaced the rear cylinder bank pre-cat sensor with an aftermarket sensor, Kwiksen from Amazon. I then cleared the codes. Replacing the sensor got rid of the P0171 and P2195 codes but the P0420 remained.P0401 and P0420 Check Emissions. So my 2007 MDX is now conveniently throwing these codes less than 2 weeks before my annual emissions check. Last week the message came up but it went away after filling up with Premium gas and making sure the cap is on tight. This weekend it's been on since Friday evening.. The most common fix for P0420 in the Acura MDX is a new cataThe most common P0420 and P0430 cause is a clogged catalytic conve NJMH · #16 · Feb 10, 2022. greg1c said: There is no 1 size fits all solution for the P0420 code. The sensor after the primary catalytic converter is sending a waveform that tells the ECM to set the code. The first thing to do is determine what underlying problem is creating the issue.Obd2 codes hi i have a 1999 acura cl 2.3 and two codes popped up the first one is code p0172 and second is p0420 they read in that order on scanner tool. could the second code cause the first code to come on but show last or is it that the first code that shows up the cause of the second code. thank you very much P0420 indicates a problem with the cat or the 2nd HO2 senso 1) Check for an exhaust leak upstream of the secondary o2 sensor. 2) Check fuel trims to ensure that there are no gross A/F mixture issues (fouling the cat) or exhaust leak. 3) Make sure there is no TSB on P0420 for your vehicle (some Hondas had a PCM update to make the P0420 cat efficiency detection less sensitive). P0420 definition : Catalyst system efficiency below thre...

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