Acura mdx p0420

Summary. Diagnostic trouble code (DTC) P0302 stands for "Cylinder 2 Misfire Detected.". The code is triggered once your ride's PCM detects frequent misfires on cylinder 2. A P0302 code can be caused by a bad fuel injector or a malfunctioning injector circuit. A failed coil pack or worn spark plug can also trigger the code.

Here are some steps to fix a P0420 code Honda Accord. First, remove the O2 sensor and pour 4-6 ounces of seafoam into the opening, replace the sensor, and leave it overnight. Reset the code and then continue driving. Increase the gap between the oxygen sensor and the converter using a spark plug non-fowler.Choose a model and build and price your new Acura! It's simple, select a car or SUV to spec out to suit your personal taste. View entire lineup here. ... MDX. High-Performance SUV. Starting at. $68,450 * BUILD. ZDX. High-Performance Electrified SUV. Starting at. $73,500 * BUILD. PREVIOUS MODELS. 2024 INTEGRA. BUILD. 2023 MDX. BUILD. 2023 MDX ...Engine codes 61-1, 83-1, PO420. I am a first time Acura owner I love my new car!!! I just bought it Thursday and while driving it home the check engine light comes on. I took it to get it checked and it is throwing 3 different codes, 61-1 Battery Voltage Malfunction, 83-1 ECM/PCM Malfunction, and PO420 Catalyst system effiency below treshold.2004 Acura MDX. 262,485 miles as of today. CEL light on, for about a month now. O'Reilly's code reader gave me: P0420. AutoZone's code reader gave me: P0420, P1454, P0455 and P0452. I'm a single Mom, full time student, with limited income and would like self repair options, if it's doable on my own. Please spare me the "just get another …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. ... If the code changes to P0420, that would indicate that one of the O2 sensors is bad on the bank 2 side ...#p0420 #p0430 #catalyticconvertercodes #badcat #autel #motoragetrainingThe “Catalytic Converter Efficiency” codes, P0420 and P0430, are among the top 10 DTCs...

jsquad091 Discussion starter. 4 posts · Joined 2021. #1 · Mar 25, 2021. I have a 2004 MDX with 154,300 miles and yesterday the CEL came with code P0420 and I noticed the idle of the car starting to get rough. I had my catalytic converter (the one under the car that is not monitored from the system) stolen last week and got that replaced already.To diagnose the P0430 Acura code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Got into a wreck front drivers side 06 mdx sustained damage, now I have a p0420 a 61-1 and 112-1 code and the engine starts rough ... Issue is 2007 Acura MDX 115k ***** *****, check engine warning light throwing P0401 "Check Emissions System" and SH-AWD warning lights. ...So about a month ago I had the CEL come on with code P0134. Easy fix, rear upstream O2 sensor was bad and needed replacement. Replaced with the NTK 24346 and code was gone. Now, one month later, the car throws a P0420 indicating a bad cat. From what I've read, this isn't super unusual for a car this age, but it strikes me as suspicious that ...The P0420 code in a Acura MDX will often be thrown one of your oxygen sensors are not functioning properly. Typically, the code will be triggered by the upstream oxygen sensor (before the converter). There aren't usually any drivability issues associated with P0420. For most people the first sign that anything is wrong at all is the service ...The outcome of the diagnosis by McGrath Acura was the front suspension mounts were making the noise and needed new struts. The dash lights warning was related to the DTC codes P0301, P0306, P0300, P0420 requiring a new catalytic converter and related sensors. The total estimate to get the MDX back on the road was $6000.00.The easiest way to check it is to remove the electrical connector from the valve, remove the hose that goes to the fuel tank and with the engine running, see if you feel vacuum at the open port of the valve. Roy. DTC P0497: EVAP System Low Purge Flow. Special Tools Required.7,723. Location. New England. Dec 23, 2018. #1. I had to put 87 octane in rural VT in a near empty 2007 Acura MDX with 185k. Within 50 miles the check engine light clicked on with P0420 announced in NAV screen. It went another tank topped with regular by in-laws who borrowed. Now with 60% premium/40 regular to make 91 octane it …

A P0420 code is set when the upstream sensor and the downstream oxygen sensor sense the catalytic converter is not doing its job. Basically, the amount of oxygen going into the converter is not being burned, and it detects it through the downstream sensor. Oxygen is the key here. Modern Engine Management Systems leave a little bit of extra ...Acura Graduate Offer. Acura Graduate Offer. $500 in savings. Acura would like to recognize your recent accomplishment by helping you get into the right luxury vehicle, with a $500 savings towards an eligible 2024 or newer Integra, TLX, RDX, MDX or ZDX vehicle when you finance or lease with Acura Financial Services (AFS) [1]. Full Description ...Aug 20, 2020 · Code P0430 Acura Description The Engine Control Module ( ECM ) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2.Got the p0420 code several years back and it turned out to be the rear cat. However, I recall the factory service manual stating that poor quality fuel (not octane) …

Save editor totk.

A 290-HP 81 V-6 mated to a quick shifting 10-speed automatic transmission delivers aggressive power and acceleration. Race through the gears with paddle shifters for a sportier drive. With up to 3,500 lbs. of towing, 91 the 2023 MDX ambitiously takes on any adventure. 19 MPG RATING CITY / 26 MPG RATING HWY / 22 MPG RATING COMBINED 140.Thanks for posting on r/MechanicAdvice!Please review the rules.Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's post on the subject. and remember to please post the year/make/model of the vehicle you are working on. Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in r/Autobody r/AutoBodyRepair/ or r/Diyautobody ...Si has venido a nuestro artículo es porque te estás enfrentando al código de falla P0420 en un Acura MDX y quieres saber cómo solucionarlo. ¡Muy bien! Estás en el sitio correcto porque aquí conocerás el significado, causas y reparación para solucionar el código de falla P0420 en tu Acura MDX.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 Contents2003 acura mdx p741 check engine light torque converter clutch circuit performance or stuck off whats the fix vehicle runs n shifts finr drained and flusher fluid clean removed shift solenoid valves a ... My 2004 Acura MDX has the code P0420 on constantly and when codes are cleared it comes back. The only other code that intermittently comes on ...Acura MDX without Park Assist Sensors, Tow Hook 2007, Rear Bumper Cover by Sherman®. Bumper Comes Primed - Ready To Paint. Restore your vehicle's appearance and replace your scratched, dinged, or damaged bumper cover with this premium... Direct fit replacement OE quality at a reasonable price. $281.97 - $315.96.

Have the dreaded P0420 code on our '01 MDX with ~130,000 miles. Our mechanic just replaced all engine and transmission mounts and looked over the whole car while doing the work. They thoroughly tested the 02 sensors so just think it is a bad cat and not worth trying to replace the sensors first. Couple of questions: 1.PLEASE direct the following question to an ACURA MDX expert.I have a 2003 Acura MDX 3.5L V6 AWD with 230k miles. VIN# ***** It's currently throwing a P0420 code. I have replaced the following hoping t … read moreNew MDX Type S is also on sale now. Price: The 2022 Acura MDX starts at $48,000. The MDX has been around since 2001, and this luxurious 3-row SUV has been a consistent solid seller for Acura. In ...But perhaps more puzzling is our test of a 2022 Acura MDX A-Spec that put down 0-60-mph and quarter-mile times of 5.7 seconds and 14.4 seconds, respectively. …Had a P0420 and P0430 code, plus the vehicle would randomly stall, most while stopped and at idle, replaced bank 1 and bank 2 catalytic converters, ... We took our 2005 Acura MDX in to dealer & got the reading P0420 bank 1 & p0430 bank 2 both said catalyst efficiency below threshold.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 failed of course. I changed the cat converter and the downstream sensor and the check engine light is still on. Any ideas what the problem is.Acura Catalytic Code P0420 - Easy Fix!!! WillFixIt. 820 subscribers. Subscribed. 557. 65K views 2 years ago. How to fix P0420 clogged catalytic converter on Acura MDX.Wasy fix with...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.2003 MDX Base Silver 142K Miles{235/65R17 Bridgestone Dueler H/L Alenza, 2004+ Headlights with H9 Bulb Conversion, Fog Lights equipped with 9012 Bulb Conversion iPOD Aux hookup to Stock Radio, Trunk Pet Net} 1991 Acura NSX Silver 31K Miles{Escort 8500 X50, K&N Intake}The most common fix for P0420 in the Acura TSX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your TSX into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Acura TSX: 1. Check for Other Codes.

The most common fix for P0420 in the Acura Integra is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Integra into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Acura Integra: 1. Check for Other Codes.

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).Features. +391. Good. 8.0. out of 10. edmunds TESTED. The versatile, well-made and feature-packed Acura MDX is arguably the most sensible choice in the midsize luxury SUV segment, especially given ...Acura MDX P0305 Definition. P0305 is a cylinder specific misfire code, which means that Cylinder 5 is misfiring and causing it. An important thing to understand when finding the location of Cylinder 5 is that it's going to be the fifth cylinder in the firing order. It won't be the fifth cylinder that you might see when looking at the engine.This page is meant to help you troubleshoot the Acura ZDX 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. TableThere are three ways to reset the Acura TL’s check engine light. We recommend trying to identify the problem and fixing it before resetting the check engine light. 1. Fix and Wait. The best way to clear the check engine light is to pull the trouble code, identify and fix the issue and then drive your TL around until the module that threw the ...The MDX boasts styling enhancements, a new 12.3-inch touchscreen interface featuring Google built-in 1, a quieter cabin, improved safety features, and a Bang & Olufsen luxury audio system. The high-performance 2025 MDX Type S with Advance Package debuts the new AcuraWatch™ 360 system that introduces more advanced driver assistive capabilities ...A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for (unlikely) A damaged or failed oxygen / O2 sensor. Downstream oxygen sensor (HO2S) wiring damaged or connected improperly. The engine coolant temperature sensor is not working properly.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...

Craigslist cars vt.

Sweet 16 verbs spanish.

Had a P0420 and P0430 code, plus the vehicle would randomly stall, most while stopped and at idle, replaced bank 1 and bank 2 catalytic converters, ... We took our 2005 Acura MDX in to dealer & got the reading P0420 bank 1 & p0430 bank 2 both said catalyst efficiency below threshold.I have a 2003 Acura MDX. VIN 2HNYD18903H531709 with 110,000 miles. Car failed Emission. DTC1 = P0420 - Catalyst sys Efficiency below Threshold (Bank 1) According to Forums, it is either O2 sensor or C … read moreThe MDX is offered with one of two powertrains, a 3.5-liter V6 that makes 290 horsepower and is mated to a 9-speed automatic, or in the MDX Sport Hybrid which uses a 3.0-liter V6 combined with an ...Acura MDX without Park Assist Sensors, Tow Hook 2007, Rear Bumper Cover by Sherman®. Bumper Comes Primed - Ready To Paint. Restore your vehicle's appearance and replace your scratched, dinged, or damaged bumper cover with this premium... Direct fit replacement OE quality at a reasonable price. $281.97 - $315.96.The P0420 code is set when the oxygen sensor after the catalytic converter gives a reading the same or very close to the reading of the oxygen sensor (s) before the catalytic converter. There are usually three possible causes... The front oxygen sensor (before the cat) is giving an incorrect reading. The rear oxygen sensor (after the cat) is ...#p0420 #p0430 #catalyticconvertercodes #badcat #autel #motoragetrainingThe “Catalytic Converter Efficiency” codes, P0420 and P0430, are among the top 10 DTCs...The outcome of the diagnosis by McGrath Acura was the front suspension mounts were making the noise and needed new struts. The dash lights warning was related to the DTC codes P0301, P0306, P0300, P0420 requiring a new catalytic converter and related sensors. The total estimate to get the MDX back on the road was $6000.00.You have replaced O2 sensors (only the forward affects P0420). The other possibility, besides a bad converter, is an exhaust leak. If you inspect and find no exhaust leaks, the converter is likely, particularly if everything else is OK; gas mileage, accleration, etc. ... 2003 Acura MDX w/ Nav 2006 Acura TSX 2010 Acura TSX 1994 Honda Accord See ... ….

Jan 13, 2023 · The P0420 does 'not' indicate a 'bad catalytic converter' - it indicates an issue with the catalytic converter system/process - efficiency, just as most codes indicate a problem with a function/process that may or may not be due to a particular part.P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE - Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and possible engine damage. Diagnosis: The most common cause of P0420 is a ...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.Summary. Diagnostic trouble code (DTC) P0302 stands for "Cylinder 2 Misfire Detected.". The code is triggered once your ride's PCM detects frequent misfires on cylinder 2. A P0302 code can be caused by a bad fuel injector or a malfunctioning injector circuit. A failed coil pack or worn spark plug can also trigger the code.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...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 ...For the spare tire hoist installation steps with full size spare: Inspect and clean these 5 holes as necessary: Install spare tire hoist with the 5 bolts included with the spare tire kit. Torque the bolt to 16 lb-ft. Remove the tire hoist cover and use wheel nut wrench with the jack handle to lower cable. Before raising the tire, make sure ...Catalytic converter cleaner. How to clean catalytic converter DIY with Scotty Kilmer. Catalytic converter clogged and problem code P0420. How to fix and repa...Do you have Check Engine Light on your car's dashboard? Does your car read code P0420? Are you unable to pass emission test or is the catalytic converter jus... Acura mdx p0420, The automobile fault code P2227 indicates a problem with the barometric pressure circuit range or performance. The estimated repair time for this fault code is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for most shops to charge between $75 and $150 per hour., Are you looking for a guide to makeup applicators? Check out this guide to makeup applicators. Advertisement For quick makeup jobs, 10 different tools might be overkill. You can pr..., Poor quality gas is a common trigger for that code. cat system efficiency below threshold bank 1. It may be a pending code, if it is detected long enough may set check engine light. If it isn't detected after a few starts may go away. If you are under 4 years/50,000 miles your emissions system is still covered under Acura warranty., 2 Answers. P0420 Catalyst sytem below efficiency below threshold Bank 1 This is for the catalytic convertor which is used to control harmful emission emitted from motor vehicles. Checck your VIN status update from the Dealer about the Recall Campaign for a ECM update.TSB # 11-017., The MDX becomes the first SUV to join our heritage of Type S high-performance vehicles with a turbocharged V-6 that produces 355-hp 126 and 354 lb-ft. 127 of torque. Super Handling All-Wheel Drive™, larger Brembo ® front brake calipers, and 21-in wheel deliver unrivaled handling. Available modern quilted leather seating surfaces, massaging ..., 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 …, 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., Problem code P0420 and P0171 on my 2004 Acura MDX | Acura MDX SUV Forums. Check Details. 2004 Acura MDX Touring 3.5 Liter SOHC 24-Valve V6 Engine Photo. Diagram Og Motorcycle Boot. Diagram On House Phone Box. Random Posts. Diagram Chevy 350 Engine; Dodge Ram Wiring Harness Recall ..., The following are the most common causes of the P0174 code. Faulty mass airflow (MAF) sensor. Blockage in the fuel filter and fuel injectors. The fuel pump is getting weak. Weakening fuel pressure regulator. The vacuum connector or PCV line may have cracks or damage. Defective oxygen sensor. Issues with PCM., 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., 2006 mdx, 200k, cel with code p0420, catalytic inefficiency Bank 1. Had this code for about 4 months. Already changed catalytic converter for bank1. No resolution. ... ACURA MDX 2003: Oxygen Sensors.....I do not have any indicator lights that something is wrong, but my gas mileage is going down. I have 160K on the MDX, never changed the O2 Sensor., 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., Apr 6, 2015 · 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., CT. Jan 26, 2022. #1. About 4 years ago, as the cold weather really set in up here in CT my 07 accord threw an P0420 code. I had was not due for my emissions test for another year and noticed no symptoms, so I let it ride. When the weather warmed up, the light turned itself off. The next year at around the same time, it threw the P0420 code at ..., The most common fix for P0420 in the Acura TLX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your TLX into an exhaust shop for an (expensive) new catalytic converter, let's ensure that's what you need. Here's a good P0420 diagnostic order for the Acura TLX: 1. Check for Other Codes., Meet the Experts. I am getting a P0420 code on a 2006 Acura Mdx. Bank 1 Sensor 2 oxygen sensor would occasionally read 1.275 Volts. Should - Answered by a verified Auto Mechanic., View the prices and specs information on the 2022 Acura MDX. Download the fact sheet now to see the dimensions and locate a dealer. We noticed you're using Internet Explorer 11, which is no longer supported on this site. ... *Prices shown are Acura suggested retail prices only and do not include taxes, title, license, destination, handling ..., The code was P0420, which is the front catalytic converter. That was replaced for $800 by the dealer. Now that I have the car back, after driving for a week and a half the check engine light comes on yet again (So annoying, RAWR!!!) ... 2003 Acura MDX w/ Nav 2006 Acura TSX 2010 Acura TSX 1994 Honda Accord See you down the ROW!, no need to replace the throttle body , and i think that you make a test before to buy any piece . disconnect the negative battery terminal few minutes, then connnect and start engine again, drive few minutes by observing the engine, if light comes again, replace only map sensor ,good luckl. 1 Answer., View the prices and specs information for the 2024 Acura MDX. Download the fact sheet now to see the dimensions and locate a dealer. We noticed you’re using Internet Explorer 11, which is no longer supported on this site. ... *Prices shown are Acura suggested retail prices only and do not include taxes, title, license, destination, handling ..., To diagnose the P0430 Acura code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., customer came w misfiring problems n your boy juniorpro fixed customer left happy.i like to help out my customers the best way i can now you wanna help us ou..., 1456 posts · Joined 2001. #8 · May 30, 2014. 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 sensor doesn't fix the problem, its not much of a loss since you probably are about due for a new one anyway if the cat is bad., 2005 MDX with just under 80K miles. Check engine light came on with P0172 code (bank 1 too rich) Freeze frame data showed combined fuel trims of -19.5 and -15.6. Thanks to this and other great posts, I did a valve adjustment. As many others report, all my exhaust valves were tight with a couple having no lash, and most intake valves were ok or ..., The P0420 code indicates that the catalytic converter is not functioning as efficiently as it should, according to the vehicle's onboard diagnostic system (OBD-II). This can affect your car's performance and emissions output., 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. The engine control module (ECM) uses two O2 sensors, one in front, and one behind ..., Detailed specs and features for the Used 2020 Acura MDX including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more., Passenger at JFK detained for transporting 70 Live Finches A passenger arrived from Georgetown, Guyana, at New York's JFK over the weekend with some unusual contraband in their lug..., 2903 posts · Joined 2015. #13 · Aug 31, 2022. The algorithm that sets the CEL for a misfire (P030X) code isn't instantaneous, so it's dangerous to make assumptions about when the code is set. It could come on just after the actual problem clears, but enough misfires have occurred to trigger the code. On my 170k mile motor, the idle wasn't ..., P0420 acura - mdx. 0 votes . 972 views. asked Aug 7, 2018 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 (13.4k points) Hi there, Trouble code P2413 indicates there is an issue with the egr. ..., 10555 posts · Joined 2007. #2 · Feb 17, 2010. P0420 seems to refer to either a bad cat or O2 sensor in cat. P0325 is the knock sensor. ***2001-2006 MDX FAQ***. 2002 Subaru Impreza WRX Wagon. 2004 MDX Touring - Midnight Blue Pearl., 2003 Acura MDX w/ Nav 2006 Acura TSX 2010 Acura TSX 1994 Honda Accord See you down the ROW! Save Share. Like. H. Hostage ... Bluepill is right on the money. I first encountered the random P0420 MIL years ago on my 2003 MDX. I took it to a Honda/Acura specialist and they quickly deduced it was simply the catalytic converter efficiency exceeding ..., The code P0420 - Catalyst Efficiency Below Threshold (Bank 1) means that there is a problem with the catalytic converter of the Bank 1. The code P0430 means the same fault for the Bank 2 catalytic converter in an engine with two cylinder banks (e.g., V6 or V8). The catalytic converter or "cat" is a key component of the vehicle emission control ...