Kia code p0420

NOTE: Take note that while the cods listed below are not strictly related to P0420 – “ Catalyst System Efficiency Below Threshold (Bank 1)”, these codes often appear with P0420. P0421 – “Warm Up Catalyst Efficiency Below Threshold (Bank 1)”. P0422 – “Main Catalyst Efficiency Below Threshold (Bank 1)”. P0423 – “Heated ...

If your Soul is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P0420 code to register. If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0420 code.If your Soul is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P0420 code to register. If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0420 code.Kia Forte P0420 OBDII Code Defined. P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here’s the technical …It states warm up…. I got a P0420 code on my 2014 Kia Soul. It states warm up catalyst efficiency, below threshold Bank 1. The car runs fine accept when after I stop at a light, and press the gas pedal, the RPM goes to 3, then back down to 2. Also when it's raining, my windows fog up if I turn on my heat but clears up if I turn on my air ...Check engine light came on, Code P0420 Catalyst System Efficiency Below Threshold (Bank 1) poped up on my scanner. Cleared the code and have driven it over 50kms, no issue (low or weaker performance). I have a 2013 Rio with 143000 kms. Warranty on emmision system ended at 130,000 kms. Hope it doesn't return, but from what I read so far, O2 ...

No difference in drivability. Checked codes and code P0420 code active 1 time. Drove around a ran some errands and code went away. A week later during some slightly spirited driving the code came back. Checked sensors and found these reading. No exhaust leaks. A/F ratio is 14.5. Car runs fine. No smells, good fuel mileage, doesn't burn oil.The P0420 is the ECU saying the Catalytic converter is not cleaning the exhaust gases enough, 99% of the time it needs a new Cat. An exhaust leak before the Cat could set that code, but anything that claims to "clean" the problem away long term is BS. Melbourne Australia. 06 Grand Carnival 3.8. mobileterminaluser and John Smith_inFL.The most common fix for P0430 in the Kia Sorento is a new catalytic converter, followed by replacing the Oxygen sensor. Before taking your Sorento 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 Kia Sorento: 1. Check for Other Codes.Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first. Read more: P0420 Kia - Warm Up Catalyst Efficiency Below Threshold Bank 1The P0420 code indicates that your vehicle’s powertrain control module (PCM) monitors the poor efficiency of the catalytic converter at Bank 1. This code may also be triggered due to a bad catalyst or a false alarm caused by a faulty oxygen sensor at Bank 1. Basically, Bank 1 and Bank 2 are the two sides of the engine.Tech Notes. The P0455 it’s a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes. ⚠ Check if your KIA have Safety Recalls.

Oct 8, 2020 · Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first. Read more: P0420 Kia - Warm Up Catalyst Efficiency Below Threshold Bank 1 Tech Notes. The P0455 it’s a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes. ⚠ Check if your KIA have Safety Recalls.P050A and secondary P0420. I own a 2014 1.6 base model with a little less than 100k in it. Was have P050A code come on in cold weather with high idle at start but then recently took it to kia to get logic update. That fixed the problem of high idle but then randomly the check engine light will come on for a couple days then go off again for a ...This page is meant to help you troubleshoot the Kia Telluride 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 …

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The most common fix for P0430 in the Kia Sedona is a new catalytic converter, followed by replacing the Oxygen sensor. Before taking your Sedona 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 Kia Sedona: 1. Check for Other Codes.P0420 KIA Possible Causes. Faulty Three-way Catalyst Converter Bank 1,Exhaust Tube,Intake Air Leaks,Faulty Oxygen (O2) Sensor,Faulty Fuel injector (s),Leaking Fuel Injector (s),Faulty Spark plugs,Improper Ignition Timing,Faulty Engine Control Module (ECM),Dirty Air Filter.Nov 12, 2018 · The most common fix for P0420 in the Kia Sedona is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Sedona 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 Kia Sedona: 1. Check for Other Codes. The revolution we've all been waiting for hasn't yet arrived. Despite the good intentions behind the movement to get people to code, both the basic premise and approach are flawed....

16 active Dashlane promo codes and offers available. Save 50% on secure password manager with a Dashlane coupon this May. PCWorld’s coupon section is created with close supervision...Check engine light came on, Code P0420 Catalyst System Efficiency Below Threshold (Bank 1) poped up on my scanner. Cleared the code and have driven it over 50kms, no issue (low or weaker performance). I have a 2013 Rio with 143000 kms. Warranty on emmision system ended at 130,000 kms. Hope it doesn't return, but from what I read …December 22, 2022 by Jason. This page is meant to help you troubleshoot the Kia Rio P0420 trouble code. It covers the P0420 code’s meaning, symptoms, …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 …P1000 Readiness Function Code. P1115 Engine Coolant Temperature Signal from ECM to TCM. P1121 Throttle Position Sensor Signal Malfunction from ECM to TCM. P1170 Front Heated Oxygen Sensor Stuck. P1195 EGR Pressure Sensor (1.6L) or Boost Sensor (1.8L) Open or Short.One of the most frequent diagnostic trouble codes (DTCs) that car owners see is P0420. It means that Bank 1’s catalytic converter performance on Bank 1 has been identified by the engine control module (ECM). The catalyst may be at fault for this code, or an O2 sensor may be to blame for a false alert. Understanding the significance of the ...The P0420 code on a Kia Forte typically indicates a problem with the catalytic converter or mass airflow sensor. This is an important emissions control component that is designed to reduce harmful emissions from the vehicle’s exhaust system. The harmful emissions dumped into the exhaust system this can trigger the warning light.Aug 4, 2022 · How to diagnose code P0420 on a Kia Sorento. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow ... 426 posts · Joined 2014. #3 · Jul 9, 2015. There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly.The P0420 is the ECU saying the Catalytic converter is not cleaning the exhaust gases enough, 99% of the time it needs a new Cat. An exhaust leak before the Cat could set that code, but anything that claims to "clean" the problem away long term is BS. Melbourne Australia. 06 Grand Carnival 3.8. mobileterminaluser and John Smith_inFL.

jeremiahchub. 56 posts · Joined 2017. #7 · Jun 12, 2019. Also, you may want to try replacing the FUEL pressure regulator itself. that code also goes with that as well. 2010 Molten Red Kia Soul +, 2.0L Beta II Engine, Mitsubishi 5-Speed (Yes the transmission real is made for Kia by Mitsubishi), and getting used to So Cal.

Code Tech Notes. As the code description implies the P0430 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 to be ... The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ... The cost to diagnose the P0430 KIA 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.About the only things that could cause P0420 are an actual inefficient catalytic converter or a bad O2 sensor. Another possibility if you have an exhaust leak upstream that occasionally goes under vacuum, I could see sucking oxygen into the exhaust and maybe triggering the code. I don't know how likely that one is on a Kia. 2016 Kia Soul ! M.How to diagnose code P0420 on a Kia Optima. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced …After this a few weeks in, the P2A03 code kept reappearing. After some research online i found for the Sedona this turned out to be an oxygen sensor. Figured out which sensor, replaced it and after a few restarts and a 5 min drive, the light extinguished and has not come back after two weeks.Apr 12, 2021 · P0420: Catalyst Efficiency Below Threshold. Related Vehicles: 2012-2018 Veloster 1.6L GDI. Notes/Hints: Check the downstream O2 sensor. If the sensors signal is dropping when it shouldn't, or reading low voltage during WOT, replace it first, clear code (s) and recheck before condemning the catalytic converter. About the only things that could cause P0420 are an actual inefficient catalytic converter or a bad O2 sensor. Another possibility if you have an exhaust leak upstream that occasionally goes under vacuum, I could see sucking oxygen into the exhaust and maybe triggering the code. I don't know how likely that one is on a Kia. 2016 Kia Soul ! M.2015 Kia Sorento LX P0420 Code & Burning oil. ... I have a 2015 Kia Sorento LX Sport Utility with 156,000+ miles on it. Since I bought the car used 5 years ago I've done my best to keep up on the maintenance including getting the oil changed regularly keeping the tires rotated and also the spark plugs have been changed recently. As well …

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Oct 21, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part... Plus: Elon Musk’s extremely busy week Good morning, Quartz readers! US state attorneys called for a recall of Kia and Hyundai cars. The vehicles are apparently too easy to steal. L...This page is meant to help you troubleshoot the Kia Sedona 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 …Can you rent a car from a dealership? We explain which car dealerships rent cars, including Ford, Toyota, and more. Details inside. Most car dealerships are individually owned and ...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 ... KiaP0420 Kia DTC P0420 Make: Kia Code: P0420 Definition: Catalyst Efficiency Below Normal (Bank 1) Description: DTC P0130, P0133, P0134, P0135, P0136, P0139, P0140 and P0141 not set, engine started, engine running in closed loop at a speed of 45-60 mph for 2-3 minutes, and the PCM detected that the rear HO2S and front HO2S voltage amplitudes …2010 Kia Soul Sport 2.0L: Replace CAT: 2007 Subaru Impreza Outback Sport 2.5L: Replace CAT: 2002 Volkswagen Jetta GLS 2.0L: Replace CAT: 2007 Hyundai Sonata Limited 3.3L: ... Code P0420 is stored by the ECU which compares the front and rear O2 waveforms. While the front one should fluctuate rapidly between 0.1 and 0.9V, the rear …Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. 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. KiaP0420 Kia DTC P0420 Make: Kia Code: P0420 Definition: Catalyst Efficiency Below Normal (Bank 1) Description: DTC P0130, P0133, P0134, P0135, P0136, P0139, P0140 and P0141 not set, engine started, engine running in closed loop at a speed of 45-60 mph for 2-3 minutes, and the PCM detected that the rear HO2S and front HO2S voltage amplitudes were too similar. Aug 4, 2022 · How to diagnose code P0420 on a Kia Sorento. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow ... Jul 9, 2015 · 426 posts · Joined 2014. #3 · Jul 9, 2015. There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. How to diagnose code P0420 on a Kia Sorento. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced … ….

Like. R. rhandwor. 1284 posts · Joined 2011. #8 · Mar 4, 2014. P0420 Code frustation. If your scanner is that good the front sensor front of Cat. should have a fluctuating wave form. The sensor behind cat. should be more steady wave form. Bang on cat. if noisy replace.Code P0420 "catalyst system efficiency below threshold." Local Kia dealer's first available slot for a diagnostic appointment is one week from now; they charge …PUK is an abbreviation for Personal Unblocking Key; your PUK code is an 8-digit code that unlocks a barred phone. If you have set a PIN password on your phone and then enter it wro...See full list on 700r4transmissionhq.com =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...P0420 KIA Possible Causes. Faulty Three-way Catalyst Converter Bank 1,Exhaust Tube,Intake Air Leaks,Faulty Oxygen (O2) Sensor,Faulty Fuel injector (s),Leaking Fuel Injector (s),Faulty Spark plugs,Improper Ignition Timing,Faulty Engine Control Module (ECM),Dirty Air Filter.Tech Notes. As the code description implies, the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory expects). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst ...الكود p0420 من أكثر أكواد الاعطال شيوعا في جميع السيارات يرتبط هذا الكود بتدني كفاءة علبة البيئة- الكتلايزر ...Save up to $160 with Logitech promo code. 49 active Logitech coupons verified today! PCWorld’s coupon section is created with close supervision and involvement from the PCWorld dea...December 22, 2022 by Jason. This page is meant to help you troubleshoot the Kia Sportage P0420 trouble code. It covers the P0420 code’s meaning, symptoms, … Kia code p0420, Sometimes, when you see O2 sensor related codes, fixing those might also fix the code P0420. If the code P0420 is the only code present, visually inspect any exhaust leaks before the rear O2 sensor. An exhaust leak may mislead the O2 sensor and trigger the code. If you find any broken, cracked or disconnected hoses, replace them and fix the code., If you are in the market for a new or used car in Tulsa, OK, look no further than Midtown Kia. As one of the leading dealerships in the area, Midtown Kia offers a wide range of veh..., KiaP0420 Kia DTC P0420 Make: Kia Code: P0420 Definition: Catalyst Efficiency Below Normal (Bank 1) Description: DTC P0130, P0133, P0134, P0135, P0136, P0139, P0140 and P0141 not set, engine started, engine running in closed loop at a speed of 45-60 mph for 2-3 minutes, and the PCM detected that the rear HO2S and front HO2S voltage amplitudes …, P1000 Readiness Function Code. P1115 Engine Coolant Temperature Signal from ECM to TCM. P1121 Throttle Position Sensor Signal Malfunction from ECM to TCM. P1170 Front Heated Oxygen Sensor Stuck. P1195 EGR Pressure Sensor (1.6L) or Boost Sensor (1.8L) Open or Short., , This page is meant to help you troubleshoot the Kia Rondo 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 …, Nov 12, 2018 · The most common fix for P0420 in the Kia Picanto is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Picanto 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 Kia Picanto: 1. Check for Other Codes. , Save up to $160 with Logitech promo code. 49 active Logitech coupons verified today! PCWorld’s coupon section is created with close supervision and involvement from the PCWorld dea..., Aug 18, 2023 · Tech Notes. As the code description implies, the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory expects). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst ... , P0420 is a diagnostic trouble code (DTC) for "Catalyst System Efficiency Below Threshold (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic ... , In this video, you'll learn the causes and solutions of the P0420 code. The causes of the P0420 code are a bad catalytic converter, an ECM update, an exhaust..., 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., Reparaturinformationen für den Kia-Code P0420. Erfahren Sie, was P0420 Kia für die Effizienz des Katalysators unterhalb der Schwelle Bank 1 bedeutet? cardigital. Heimat; Auto-Codes; Auto-Codes. P0420 KIA - Aufwärmen der Katalysatoreffizienz unterhalb der Schwelle Bank 1 Posted on April 2024., 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 …, /nwsys/www/images/PBC_1251019 Research Announcement: Vollständigen Artikel bei Moodys lesen Indices Commodities Currencies Stocks, May 11, 2019 · Here’s a good P0420 diagnostic order for the Kia Spectra: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Spectra is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your car. Misfire Codes. , 1 Answer. Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that ..., My soul had that code a month ago. Disappeared after 3 days. Still though I added cat a clean and gave it the more expensive gas. Last week I added the regular E87, cel came up with the same code. It went away on Monday. My car hates the cheap gas. The catalytic converter might be ding dong but a new one will run you over 1k, at the Kia dealer, HYUNDAI KIA CODE P0420 CATALYTIC CONVERTER FIX, ENGINE LIGHT ONIf you have Hyundai or Kia and you have engine light and code P0420 Catalyst System Efficiency..., Yes, exactly. If the rear o2 or called bank 1 sensor 2 fluctuates from nearly 0 to .9 back and forth the cat is not cleaning up anything and the ecm will set p0420 and tell you that it is inefficient at it's job. P0420 is set when the ecm believes that it is less than 50% efficient than designed., Diagnostic trouble code(DTC) P0420 stands for “P0420 Catalyst System Efficiency Below Threshold (Bank 1).”. It indicates that the exhaust system’s oxygen levels are below the required threshold in Bank 1, which can damage the engine’s exhaust and fuel system. Bank 1 refers to the side of the engine that houses the number one cylinder., 370. 104K views 5 years ago. Learn how to properly use Kia's Smart Key Fob and Standard Key Fob to open, close and lock the tailgate with ease, including …, Kia Rio throwing P0420 code . I have a 2017 Kia Rio, we’re at 5.5 years and just over 130,000 km. A few weeks back my check engine light came on, I ran a code reader and got P0420. Google suggested it might be my gas cap, among a bunch of worse-sounding issues, so I thought let’s try the easiest thing on this list. ..., Some common Kia codes include P0300 (Random/Multiple Cylinder Misfire Detected), P0420 (Catalyst System Efficiency Below Threshold Bank 1), and P0171 (System Too Lean Bank 1). These codes indicate issues …, Mar 18, 2024 · P0420 code. I have a 2016 Kia Soul 1.6L, we have had a run around with Kia over these codes. We first had the Knock Sensor put in and after that the engine light would come on and off from time to time. We contacted the Kia dealer we purchased it from and spoke with the maintenance dept manager. He said that when the seasons change that it ... , Here’s a good P0420 diagnostic order for the Kia Amanti: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Amanti is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your car. Misfire Codes., A serpentine belt drives the alternator on the Kia Sephia and changing it is a great project for the novice or home mechanic. The belt routing is important, so be sure to check the..., Nov 12, 2018 · Here’s a good P0420 diagnostic order for the Kia Sportage: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Sportage is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your vehicle. Misfire Codes. , 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., Oct 8, 2020 · Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first. Read more: P0420 Kia - Warm Up Catalyst Efficiency Below Threshold Bank 1 , Here’s a good P0420 diagnostic order for the Kia Amanti: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Amanti is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your car. Misfire Codes., KiaP0420 Kia DTC P0420 Make: Kia Code: P0420 Definition: Catalyst Efficiency Below Normal (Bank 1) Description: DTC P0130, P0133, P0134, P0135, P0136, P0139, P0140 and P0141 not set, engine started, engine running in closed loop at a speed of 45-60 mph for 2-3 minutes, and the PCM detected that the rear HO2S and front HO2S voltage amplitudes were too similar., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...