Kia soul code p0420

Jan 6, 2014 · 2014 1.6 base soul P0420 and a vacuum leak I can’t find. I reset the p0420 code a couple of times and it would stay away for a couple of weeks. Now it comes on a day later. I had the cat recall software update done at 90k miles so the overheating damage wore it out enough before they could recall it. At 130k now and the light keeps coming on.

Kia soul code p0420. Does Cataclean really fix a P0420 / P0430 error code and catalytic converter. Cataclean Link: https://amzn.to/33t8RVQ Second channel for easy to follow Home ...

Yes, P0440, P0441, and P0446 codes are all related to the evaporative emission control system in a Kia Soul. The P0440 code indicates a general issue with the system, while the P0441 code signals a problem with the EVAP system’s purge flow, and the P0446 code is related to vent control issues. While these codes are distinct, they all …

Here’s a good P0420 diagnostic order for the Kia Sorento: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Sorento 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.Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won’t pass an emissions test. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components.2015 Kia Soul Base (1.6L, A/T) P0420 Code. Bought it from a Chevy dealer about a month ago. 72,000 miles on the clock. Maybe 2000 of that is from me. First day exploring my intermittent O2 sensor code I’ve had since the second week of ownership.P0420 just changed plugs. I’m throwing a p0420, in a previous post. I experienced a no start condition which ultimately was a crank sensor (p0355) I changed the plugs as a tune up yesterday. Car is running great. Driving to the gym I threw a p0420, some say cat. Some say o2 sensors.Jan 19, 2022 · 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 ... 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 ...B. bwdz75. 3268 posts · Joined 2020. #3 · Nov 13, 2020. P050A is a code for higher than expected idle RPM. It happens to all Souls on startup in cold weather at times. Throttle body cleaning, carbon cleaning etc.. can kind of help it …The P0420 code in a Kia Soul 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). OBD-Codes › p0326

I have a 2015 Kia soul with a p0420 code, I replaced the catalytic converter and both 02 sensors and still have the - Answered by a verified Auto Mechanic. We use cookies to give you the best possible experience on our website.I have a 2012 Soul+ Automatic (KNDJT2A63C7427727) with ~38500 miles that I got new. And a few weeks ago I got a Check Engine Light; off now, not reset. Took it to O'reillys to get the code read and I was told it was code p2096. I have an appointment soon with Kia but wanted to know more about what may possibly be going on before hand.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.How To Diagnose. If you are experiencing problems with your Kia Soul related to the P0441 code, then there are several steps you can take to diagnose the issue. First, check the fuel cap on your Soul and ensure that it is tightly secured. A loose or faulty fuel cap is often the cause of the P0441 code. If the fuel cap appears to be in good ...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0420 Saving Repair Parts:C...P1326 is a very common code to find in the Kia Soul. It indicates that the Knock Sensor Detection System has detected excess engine vibration. An actual engine knock most commonly causes it, but a bad knock sensor or wiring problems are also common causes. Repairing P1326 should be considered a high priority since it indicates …P0420 error code popped up after I filled with premium, dealer says it's the catalytic converter. Any tips? Just over 90k, 2016 model. Dealer quoted me over $2000 for a new …Potential short squeeze plays gained steam in 2021 and have continued through 2022 with new traders looking for the next huge move. High short in... Potential short squeeze plays ...

Dec 22, 2021 · My check engine light was on, now it's off. Code P0455 and P0420, mechanic says I need 2 catalytic converters. Car is 2015 Kia Soul , car isn't getting enough power on interstate or going uphill shoul … read more In the same way that visiting a new place can help you face your fears, engaging in some form of spiritual healing can suddenly seem more appealing to travelers too. We're partneri...2014 Kia Soul P0463, P0420,P0300- where to start . My adult daughters car. This probably rides in town as good as any of my Toyotas and Hondas that I own. Base model, 160k miles, second owner (last 100k miles). ... 2017 Hyundai Accent Code P0420 ...After that the P0420 code came on, ... Come discuss the Kia Sorento, Rio, Sportage, Soul and more! Show Less . Full Forum Listing. Explore Our Forums. 2011 - 2013 (XM) Sorento Forum 2016 - 2020 Sorento Forum 2003-2010 Sorento Forum 3G 2011 - 2016 Sportage Kia Cee'd Forum.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.

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P0420 Catalyst System Efficiency Below Threshold. 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. Several possible issues to check. eGAK009.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 ...P0420 KIA Code - Warm Up Catalyst Efficiency Below Threshold Bank 1. Table of contents. What does this mean? What are the Possible Causes of the DTC P0420 KIA? NOTE: …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 ...Kia soul p0420 . Family members 2016 Kia soul CEL came on as she was driving down the highway. And she lost most engine power, couldn’t get above 30. ... And almost completely loses power to where you can’t really go more than 10-15, code it threw was p0420, bank 1. when I hooked it up.p0420 uh oh. so at just under 80k (79,618) the engine light been coming and going .i go get it read free at autozone . p0420 code .a cat /sensor code. being the second owner we rush it to kia as emmissions are only covered until 80,000 for second owner . rather that then a way overpriced sensor i would be out for and a 100 dollar diagnostic fee .

Jul 29, 2023 · How To Diagnose. If you are experiencing problems with your Kia Soul related to the P0441 code, then there are several steps you can take to diagnose the issue. First, check the fuel cap on your Soul and ensure that it is tightly secured. A loose or faulty fuel cap is often the cause of the P0441 code. If the fuel cap appears to be in good ... 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.Jan 17, 2023 · I believe the key thing to look at for a P0420 code is the downstream O2, or bank 1 sensor 2 B1S2. 2016 Kia Soul ! ... Kia Soul Forums :: Kia Soul Owners. 423.6K posts 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 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.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 conditioner, even when it ...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 …The Kia Spectra has three engine options--the 1.6-liter four-cylinder, the 1.8-liter four-cylinder and the 2.0-liter four-cylinder engines. Although the location of the starter is ...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...

Mar 18, 2024 · 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 could be the gas going from summer to winter and the sensor is triggered.

What Does The P0420 Code Mean? 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 …The P050A code in a Kia Soul can have various underlying causes. Some common reasons include a faulty or clogged idle air control valve, vacuum leaks, issues with the throttle body, a malfunctioning ECM, or wiring problems. It is important to perform a thorough diagnosis to pinpoint the exact cause and proceed with the appropriate repairs.KIA OPTIMA CODE P0340 P0341 P0342 P0343 P0344 CAMSHAFT POSITION SENSOR FIXIf you have Kia Optima and you have engine light and code P0340, P0341, P0342, P034... The code is a generic one. Everything i read said it could be the upstream o2 sensor, gas cap, or catalytic converter. Mine turned out to be the catalytic converter. Feb 26, 2022 · CODE P0420 CHECK ENGINE LIGHT ON FIX HYUNDAI KIA, CATALYTIC CONVERTER FIXIf you have Hyundai Sonata and you have check engine light and code P0420 Catalyst E... For a complete list please see our Kia OBD2 codes list page. For best results, please look up your Kia model if available in our OBD2 model table on this page. OBD-II. P0100. Mass Air Flow or Volume Air Flow Circuit Malfunction. P0101. Mass Air Flow or Volume Air Flow Circuit Range/Performance problem. P0102.2014, 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 bit, found a spot to stop. Turned engine off.

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1999 Honda Civic EX 1.6L with p0420 code. Problem: MIL Lamp on (P0420) Diagnosing: ... 2010 Kia Soul Sport 2.0L: Replace CAT: 2007 Subaru Impreza Outback Sport 2.5L: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 ...Christian Roots: All Saints' Day and All Souls' Day - All Saints' Day was created by the Catholic Church to legitimize the pagan celebrations of late October. Learn about All Saint...Nov 14, 2018 · A professional shop can use a smoke machine to test precisely where your Soul’s EVAP system is leaking from. The vapor canister purge valve is a common cause of the P0442 trouble code and the Kia Soul. The purge valve lets fuel vapor out of the charcoal canister and into the intake manifold. They are easy to replace. P0420 is catalytic converter efficiency below threshold. Triggered when the ECU doesn't like the output of the downstream O2 sensor. If I got 288,000 miles out of a …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.TSB: SC176 (Rev 1)Soul (AM, PS) April 2019 SUBJECT: Inspection Procedure: 1. Using the KDS (connected to the internet to create and transmit a VDN*), perform a Fault Code Search and confirm DTC P0420 or both P0420 and P030X is/are stored (Active, History or Pending). Follow the flow chart below and perform the necessary procedure(s).Check light code P0420. 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, …Tried resetting code by removing battery cable but didn't work I had the engine replaced 2-3 months ago, wonder if a hose came lose or something? Should I bring it back to the dealer, is this something that's under warranty? ... Kia Soul 2015 2.0 litre EX GDI Alien Green II Pearl ~73K km (45K miles) Michelin CrossClimate tires.Kia Soul runs good, but check engine light on and P0420 code shows; must problem be catalytic converter? asked 2 months ago in Kia by Dick. 2015 Kia Soul has 98,000 miles...Check Engine has been on for almost 15,000 miles. No degradation in performance. oill has been changed every 4000 miles since new.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.2015 Kia soul Base model - mileage 112,600 starts for few seconds and then starts flashing check engine light and dies. Replaced battery, alternator, exhaust Crankshaft Position sensor, and spark plugs (with NGK IR) Ran OBDll reader and have. P0302 misfire; P0420 cat converter bank 1 efficiency below threshold ….

PO420: P0420 Catalyst System Efficiency Below Threshold. How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which …Tried resetting code by removing battery cable but didn't work I had the engine replaced 2-3 months ago, wonder if a hose came lose or something? Should I bring it back to the dealer, is this something that's under warranty? ... Kia Soul 2015 2.0 litre EX GDI Alien Green II Pearl ~73K km (45K miles) Michelin CrossClimate tires.P0420: Catalyst System Efficiency below Threshold – Bank 1. P0422: ... I Have a PO269 code on my 2014 Kia Sorrento I can’t find it any information on what that code means. ... Hello what does code P2191 on a Kia Soul 2017. 0. Reply. Author. BAT Team. 2 years ago. Reply to Ana rodriguez .R. Rio Taxi. 631 posts · Joined 2016. #6 · Sep 5, 2022 (Edited) You are probably burning oil. I did both cats and both sensors over 2 months. A week later the P0420 codes returned after the downstream 02 sensor and cat was done. 2 weeks later it was game over. Burning a liter every 2,000 km. Rings were bad.Korean auto manufacturer Kia’s in-car infotainment system, known as UVO, gives you quick and easy access to a variety of features from navigation to music, including uploading your...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code KIA P0442 Saving Repair ...P0420 Code 2011 Rio Base. ... I've actually tried that myself and, as expected, it didn't resolve my P0420 on a non-Kia vehicle. I did get the code resolved with a $100 cat from an Ebay seller. ... Come discuss the Kia Sorento, Rio, Sportage, Soul and more! Full Forum Listing. Explore Our Forums. 2011 - 2013 ...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... Kia soul code p0420, May 22, 2023 · Or is there no effect on driving it only check engine light is On. DTC Symptom Descriptor P0420 & P04DF. The Catalyst System Efficiency Below Threshold (Bank 1) The most possibly causes. Exhaust system. Downstream oxygen sensor. Catalyst converter. Out-of-range ECT sensor. Exhaust manifold. , P0441 is one of the more common OBD II codes that can occur in the Kia Soul . It is frequently caused by a loose or bad gas cap, cracked or disconnected EVAP system hoses, vacuum leaks, or a bad purge valve. Always start by taking a look at the gas cap. P0441 is related to the evaporative emissions control system (EVAP) and should …, Check engine light code P0420 on 2014 kia soul . Changed the catalytic converter and both O2 sensors not sure what is causing the fault Locked post. ... Try having a mechanic look for past misfire codes. My Kia was part of the recall and they fully replaced my cat for free., All Of The Kia Trouble Codes! ... P0420 Catalyst System Efficiency below Threshold - Bank 1. ... 2001 Audio A6, 2003 GMC Sierra, 2016 Kia Optima SXL, 2019 Kia Soul Plus Special Edition. Save Share. Like. 0 Reply. This …, Fixing P0128 in the Kia Soul is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows coolant to ..., 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., 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 conditioner, even when it ..., The most common cause of the P0420 engine code is a degraded catalyst. Catalytic converters/catalysts break down over time and can also become clogged. Cylinder misfires will significantly reduce ..., #1 · Mar 18, 2024. 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 …, 2014 Kia Soul P0463, P0420,P0300- where to start . My adult daughters car. This probably rides in town as good as any of my Toyotas and Hondas that I own. Base model, 160k miles, second owner (last 100k miles). ... 2017 Hyundai Accent Code P0420 ..., The recall began November 16, 2017. Owners may contact Kia customer service at 1-800-333-4542. Kia’s number for this recall is SC155. Note: This recall supersedes campaigns 14V-332 and 15V-736. Vehicles previously remedied under those numbers are being recalled again under this campaign. 3/1/2015., 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..., Dec 27, 2022 · Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won’t pass an emissions test. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components. , 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..., When you see a DTC Code P0420, there’re several checks you can do: Check the code from your OBD2 Scanner / Car Code Scanner and verify that it’s the only code present. If other codes are on the list, they should be checked first. Sometimes, when you see O2 sensor related codes, fixing those might also fix the code P0420., Some common faults codes found With the Kia Soul are: P0300 – This code points to a misfiring cylinder, this could be caused by too little fuel being burned, or a damaged spark plug. P0420 – Poor efficiency found in the catalyst system, oxygen levels are too low and can create a problem with the vehicle’s exhaust system., My daughter has a 2015 Kia soul with the 1.6. 106,000 miles and it’s throwing the p0420. I reset it and it comes back. I ran the vin and it shows no active recalls. Is there a way to verify Kia actually already did the converter or does the recall notice state to take it to a Kia dealer when the code comes on., 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., Mar 18, 2024 · 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 could be the gas going from summer to winter and the sensor is triggered. , Kia P0420 Catalyst System ... OBD2 Code P0421 Kia definition: Basically this means that the oxygen sensor ... ,2013 Kia K9,2013 Kia Cross GT Concept,2013 Kia Ceed SW,2013 Kia Ceed,2013 Kia Carens,2013 Kia CUB Concept,2012 Kia Soul,2012 Kia Rio,2012 Kia Ray,2012 Kia Picanto,2012 Kia K2,2012 Kia Grand VQ-R,2011 Kia Sportage,2011 Kia ..., As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix ..., 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., What are the Possible Causes of the Code P0420 KIA?# Faulty Three-way Catalyst Converter Bank 1# Exhaust Tube# Intake Air Leaks# Faulty Oxygen (O2) Sensor# F..., 2015 Kia soul Base model - mileage 112,600 starts for few seconds and then starts flashing check engine light and dies. Replaced battery, alternator, exhaust Crankshaft Position sensor, and spark plugs (with NGK IR) Ran OBDll reader and have. P0302 misfire; P0420 cat converter bank 1 efficiency below threshold, Sep 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... , Some common faults codes found With the Kia Soul are: P0300 – This code points to a misfiring cylinder, this could be caused by too little fuel being burned, or a damaged spark plug. P0420 – Poor efficiency found in the catalyst system, oxygen levels are too low and can create a problem with the vehicle’s exhaust system., 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 catalytic converter efficiency below the accepted threshold, indicating that the converter is not effectively reducing harmful emissions., 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., 2015 Kia Soul base P0420 P0301. I have a Soul with the 1.6L, auto, 107k miles on it. Couple weeks ago got the P0420 and figured to change spark plugs, air filter, pcv, and both o2 sensors. Hoping it would fix the issue. Yesterday I caved in and bought a new catalytic converter and installed it., Does Cataclean really fix a P0420 / P0430 error code and catalytic converter. Cataclean Link: https://amzn.to/33t8RVQ Second channel for easy to follow Home ..., 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..., 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, Posted by u/That-Mall-8347 - 8 votes and 7 comments