Kia code p0420 - 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.

 
The P0420 code in a Kia Sorento will often be thrown if one of your vehicle’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.. Comanche county juvenile detention center

Feb 16, 2022 · 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... One of the most common catalytic converter codes your vehicle will throw at you is the P0420 (not to be mistaken with trouble code P0430). This diagnostic trouble code (DTC) stands for "Catalyst System Below Efficiency", coming from the bank 1 mounting position.Last spring on cold mornings the check engine light would come on with the P0420 code when I check it with my code reader. Then nothing all summer but with the cold weather back, the light is coming on more frequently. ... Kia Soul 2015 2.0 litre EX GDI Alien Green II Pearl ~73K km (45K miles) Michelin CrossClimate tires.Engine Misfire Codes; Each of these codes are very well likely indicators of what caused the 420/421 code to come on. It’s important to note that any combination of codes with the 420/421 code should be checked first as they are likely causing it. Where things can get really tricky, however, is when just the 420/421 code arrives by itself.#1 · Nov 2, 2019. 2015 Soul, 1.6 L, V4 - 93,000 + mi. Code P0420 Catalyst operating below minimum threshold. P0420 is an all around code dealing with emmisions. To learn more about this code, view YouTube videos of …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. The 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.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 ...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.How to fix a Toyota P0420 Code, "Catalyst System Efficiency Below Threshold (Bank 1)."Link to Cataclean on Amazon: https://amzn.to/3TSI6xWPossible Causes of ...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. December 22, 2022 by Jason. This page is meant to help you troubleshoot the Kia Sorento P0420 trouble code. It covers the P0420 code’s meaning, symptoms, …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. Los signos de un código de falla P0420 KIA pueden ser: Eficiencia del catalizador de calentamiento por debajo del umbral, banco 1. Se enciende la luz de fallo de motor (Check Engine). Pérdida de potencia en el vehículo. Aumento en el consumo de combustible. Olor a huevos podridos proveniente del escape. 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 ... Has your check engine light recently turned on? Are you seeing the dreaded error code P0420 on your vehicle’s diagnostic scanner? Don’t panic just yet. Code P0420 is a common issue...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.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.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.How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which means the catalytic converter is no longer performing at a normal level. www.obd-codes.com USA - 1999 Kia Elan 1.8L, 2017 Ford Edge Sport 2.7L V6 T, 2015 Ford Mustang 3.7L V6, 2013 BMW K1600 6cyl GTL. Save Share. Like.Whether you just want to be able to hack a few scripts or make a feature-rich application, writing code can be a little overwhelming with the massive amount of information availabl...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...Catalytic converter cleaner. How to clean catalytic converter DIY with Scotty Kilmer. Catalytic converter clogged and problem code P0420. How to fix and repa...Aug 4, 2022 · 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 exhaust flow, as ... 704. 123K views 2 years ago. HYUNDAI KIA CODE P0420 CATALYTIC CONVERTER FIX, ENGINE LIGHT ON If you have Hyundai or Kia and you have engine …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.The Kia Code P0420 refers to a diagnostic trouble code that indicates a problem with the catalytic converter in a Kia vehicle. The code specifically points to a …Oct 21, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part... 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. 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. 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.Mar 16, 2020 · Just click in the upper right corner where it says Login/Join. We look forward to your continued parcipitation. Check engine light. P0420. P0420 Catalyst System Efficiency below Threshold. 2018 Niro LX HEV with just over 34,000 miles. So the catalytic converter for some reason is not working as it is supposed to. The P0420 code is a diagnostic trouble code that indicates a problem with the catalytic converter efficiency in a Kia Sorento. When this code appears, it means that the catalytic converter is not functioning optimally, resulting in higher emissions. 2. Common Causes of the P0420 code in Kia Sorento. There are several common causes for the P0420 ...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 …=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0420 Saving Repair Parts:C...The P0420 code is a common diagnostic trouble code that indicates an issue with the catalytic converter in your Kia Soul. When this code appears, it typically means that the catalytic converter is not functioning optimally and may need to be replaced.My car is showing a P0420 code with CEL on the dash and while I was doing some research as to the possible causes and what not it was saying that the most …How to diagnose code P0420 on a Kia Niro. 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 …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 Picanto around until the module that threw the code recognizes that the problem is fixed. Sometimes it can take a few drive cycles for your car’s check engine light to shut down.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.December 22, 2022 by Jason. This page is meant to help you troubleshoot the Kia Picanto P0420 trouble code. It covers the P0420 code’s meaning, symptoms, …Yes, partially; the Hyundai Motor Company owns about a third of Kia Motors. Both Kia and Hyundai are large automobile makers originally based in South Korea. Hyundai is the largest... 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. How to fix a Toyota P0420 Code, "Catalyst System Efficiency Below Threshold (Bank 1)."Link to Cataclean on Amazon: https://amzn.to/3TSI6xWPossible Causes of ...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 ...If you are a car owner, it is likely that you have encountered the dreaded check engine light at some point. One of the most common trouble codes that many drivers come across is c...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 …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 1P0420 Kia Catalyst System Efficiency Below Threshold Bank 1. As the code description implies the P0421 Kia 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 ...The P0420 code in a Kia Sorento will often be thrown if one of your vehicle’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.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....P0420 Kia Catalyst System Efficiency Below Threshold Bank 1. As the code description implies the P0421 Kia 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 ...The 2023 Kia Telluride is an exciting new SUV that is sure to turn heads. It is the perfect combination of style, luxury, and performance. Here’s what you need to know about the 20...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.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.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.Definition meaning and fixes KIA P0420: Warm Up Catalyst Efficiency Below Threshold Bank 1 Diagnostic Trouble CodeP0420: význam, příčiny, opravy. Význam kódu P0420. Chybový kód P0420 indikuje, že katalyzátor nepracuje účinně, a obvykle i to, že je nutné ho vyměnit. Pokud se objeví, nutné bude provést diagnostiku motoru, a diagnostiku systému vstřikování paliva, zapalování, a výfukového systému. Příčiny P0420.8 posts · Joined 2022. #1 · Feb 19, 2023. 2015 Soul 1.6 180,000mi. My girlfriend got the car used from a small lot. It very quickly threw p0420. After a reset, it came back. Over the course of 3 months and the lot owner trying "magic mechanic in a bottle treatments" (I'm not a fan of these) he finally changed the mani/cat.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 exhaust flow, as ...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 …Oct 21, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part... As for that code for a Subaru, it could be a number of possible issues causing the code. It's rarely a bad cat, but other issues from the engine that are causing crap emissions issues. The P0420 code is one of the hardest to actually fix, as it could be too numerous a list of possible problems causing it. PCV valve Air filter Spark plugs Vacuum ...How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which means the catalytic converter is no longer performing at a normal level. www.obd-codes.com USA - 1999 Kia Elan 1.8L, 2017 Ford Edge Sport 2.7L V6 T, 2015 Ford Mustang 3.7L V6, 2013 BMW K1600 6cyl GTLSep 28, 2022 · 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... 2014, Soul+ P0300 code. While traveling, had to jump hard on the brakes, then accelerate within a split second. The Soul started sputtering, missing, Check Engine light blinking, then full on. Creeped down the road a …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 …2015 Soul, 1.6 L, V4 - 93,000 + mi. Code P0420 Catalyst operating below minimum threshold. P0420 is an all around code dealing with emmisions. To learn more about this code, view YouTube videos of scannerdanner. Understanding Short Term and Long Term Fuel Trim (a SD Premium video) Watch on.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 ...114. 57K views 5 years ago. Learn all the functions of your windshield wipers, as well as how to replace them on your Kia vehicle with these easy-to-follow steps.Engine Misfire Codes; Each of these codes are very well likely indicators of what caused the 420/421 code to come on. It’s important to note that any combination of codes with the 420/421 code should be checked first as they are likely causing it. Where things can get really tricky, however, is when just the 420/421 code arrives by itself.What Does the P0420 KIA Code Mean? The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module ( PCM ) compares the output signals of the front and rear oxygen sensors to determine whether the output of the rear sensor is beginning to match the output of the front oxygen sensor.I may have looked like an idiot while charging an electric Kia at a Tesla charging station, but the experience was smooth and easy overall. Jump to On paper, electric cars handily ...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 ... My car is showing a P0420 code with CEL on the dash and while I was doing some research as to the possible causes and what not it was saying that the most …Has your check engine light recently turned on? Are you seeing the dreaded error code P0420 on your vehicle’s diagnostic scanner? Don’t panic just yet. Code P0420 is a common issue...The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency of the catalytic converter …Low-code is a way to design and develop applications with little or no coding. It empowers users with little to no technical background. * Required Field Your Name: * Your E-Mail: ...Oct 21, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part... Code P0420 KIA Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic …Feb 9, 2022 · P0420 has been coming up regularly for 6-8 months now, and my front cat finally plugged up this week. $1,400 CAD for the parts only, but if I had set the parts aside ahead of time from Rock Auto, I would have paid about $1,000 in total for these items. Labor was another 3.5 hours to replace everything. The most common fix for P0420 in the Kia Forte is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Forte 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 Forte: 1. Check for Other Codes.The most common fix for P0430 in the Kia Sportage is a new catalytic converter, followed by replacing the Oxygen sensor. Before taking your Sportage 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 Sportage: 1. Check for Other Codes.

114. 57K views 5 years ago. Learn all the functions of your windshield wipers, as well as how to replace them on your Kia vehicle with these easy-to-follow steps.. Homes on beaver lake arkansas for sale

kia code p0420

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.2015 Soul, 1.6 L, V4 - 93,000 + mi. Code P0420 Catalyst operating below minimum threshold. P0420 is an all around code dealing with emmisions. To learn more about this code, view YouTube videos of scannerdanner. or any other videos explaining about 02 sensors, fuel trims, catalytic converter, etc.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.If the P0420 code is combined with other codes it's always a good idea to fix them in order. Your Catalytic Converter Should Never Have Failed. If It Did, Th...The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor(s) and an increase in switching activity—from rich to lean to rich, etc.—that closely resembles the front Oxygen Sensor(s) during the time the computer is activating the Catalytic Converter monitor test.The most common fix for P0420 in the Kia Stinger is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Stinger 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 Stinger: 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.See full list on 700r4transmissionhq.com Nov 12, 2018 · The most common fix for P0420 in the Kia Stinger is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Stinger 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 Stinger: 1. Check for Other Codes. 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 ...2014 Kia Soul - Check Engine Light Code P0420 Jump to Latest Follow 27K views 14 replies 4 participants last post by kiaguy002 Sep 18, 2018Nov 2, 2021 · 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. When the P0420 code appears, the catalyst system efficiency is below the threshold for a particular engine bank, often referred to as Bank 1. This code is related to the vehicle's catalytic converter and oxygen sensors. The primary purpose of a catalytic converter is to reduce harmful emissions from the engine by converting toxic gasses, such ...If the P0420 code is combined with other codes it's always a good idea to fix them in order. Your Catalytic Converter Should Never Have Failed. If It Did, Th...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. 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 ... 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.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 ....

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