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Pesky P0420 Keeps Returning. I have a 2005 Hyundai Elantra GLS that keeps throwing a P0420 code. No other codes just the P0420. Vehicle has 147,000 miles and runs great. Getting 30 MPG even with the P0420. Plugs and wires only have 28,000 miles on them. No exhaust leaks anywhere.. David kaye tcap

The p0420 code is an important warning signal in your hyundai accent that relates to the check engine light. The code indicates a problem with the catalytic …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...A somewhat common issue with the Hyundai Tucson is the P0449 code. This code references a number that is given to you when you plug it into a OBD2 scanner. P0449 deals with the evaporative emissions control (EVAP) system. It often appears with, or is related other codes, such as P0420, P0446, and very often P0455.The first time it was on a 6 cylinder vehicle that had 4 sensors. I changed the one sensor kicking out the code (P0421 I think). This lasted a week or so. Then I got a P0422 which was the other sensor on the same side. This lasted another few days. Then the codes were pointing to the other side's exhaust so I just replaced both and the problem ...Here’s a good P0420 diagnostic order for the Hyundai Elantra: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Elantra 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 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 ...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency of the catalytic converter …Code P0420 Hyundai Description Code P0420 for a Hyundai describes how the efficiency of the catalytic converter is determined by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module (PCM) uses output signals from both the front and rear oxygen sensors to determine whether the rear sensor’s output is beginning to ...Bad gas cap or the purge valve which is part of the vacuum system is going bad and intermittently tripping the code. I just replaced this on my moms 2008 Jeep patriot last weekend for the same code. Problem solved for about $35. Use your OBD2 reader to clear the code and then drive it on the highway for about 30mi. So it has time to cycle the ...What to do when you get a P0420 catalytic converter code. If you’ve got a check engine light with either a P0420 P0420 catalytic converter code or a P0430 trouble code, don’t automatically replace the oxygen sensor. Why? Because a herP0420 catalytic converter code is almost NEVER caused by a bad oxygen sensor. Here’s a step by step … tucson 2.0l dtc p0420 -subject: ecm update and catalyst replacement tsb #: 20-fl-010h page 3 of 3 subject: ! rom id table: vehicle engine trans immo emissions ecu p/no. rom id old new tucson (tl pe) 2.0gdi 6at yes 39131ulev -2etf0 ggtl-inuaqs00c00 gtl-0nu0aq000c00 gtl-0nu0aq100c00 no ulev 39133 -2etf0 ggtl inuaps00c00 gtl 0nu0ap100c00 Or the sensor from your car into an Accent without any P0420 code. A conclusive test of the catalytic converter is to measure the temperature with an infrared thermometer at the inlet of the cat and at the outlet. Since the converter is burning leftover products of gas the temperature should be higher at the outlet than the inlet.Hyundai karaoke discs are programmed with music, video and scrolling lyrics for playback on a karaoke machine connected to a TV or monitor. These discs can also be played on a comp...Here’s a good P0420 diagnostic order for the Hyundai Genesis: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Genesis 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 Hyundai Tucson 2.0 P0420 My car started throwing the P0420 code which is almost always a bad cat that needs to be replaced. I had my mechanic put in an order for a universal cat to replace my oem buy I stopped him because I noticed O2B1S1(Upstream) did not have a voltage reading but O2B1S2 did.2016 Elantra 1.8, P0420 only w/ new cat and O2's. I purchased a 2016 Elantra Limited 1.8 w/86k yesterday from a BHPH lot, so no warranty. I did a thorough inspection of the car and everything seemed good. I was allowed to test drive the car with no employee or salesperson. From start up to shutdown, test drive included, the engine …I have 2012 Hyundai Accent and been receiving the P0420 code few times. It stays on for 2-3 days and then goes out automatically. ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona! Show Less .Hyundai Models. Elantra & Lantra Forums. MD (2011-2016) Elantra sedan/coupe. 2014 Elantra P0420 Code. 1213 Views 6 Replies 4 Participants Last post by Propflux01, Jun 16, 2018. B. breakinglink Discussion Starter · Jun 14, 2018. Add to quote; Share Only show this user. Hey all! If this is in the wrong forum, let me know so I can …#1 · Mar 12, 2013. Today all of sudden I got the check engine lights on my Hyundai Sonata (2008) while the vehicle was not showing any degradation in performance and it was …P0420 code. Catalyst Effeciency Below Norma (Bank 1) This was the explanation I got from autozone. First question is how serious is this? ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona!this 2019 Hyundai Tucson has a p0420 code. im replacing a faulty manifold catalytic converterPorsche will launch the Cayenne, priced at around Rs2.35 crore. India’s biggest annual festival season is on the horizon. And carmakers are doubling down on their offerings. The ne...6/25/2020: I got the P0420 code again. Oh, well--at least I had 7 good months! To add: ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona! Show Less .Hyundai dealers, corporate reps, etc, please message the mods about an official flair. Members Online. P0420 Code - 2013 Accent upvote r/toyotasequoia. r/toyotasequoia. Dedicated to Toyota's behemoth 4x4 SUV ... 2000 EX model: P0420 Code comments. r/AskMechanics. r/AskMechanics.Like the title says my Veloster is throwing the P0420 code every so often. It kinda comes and goes, like I'll clear it and after like a week or two (sometimes longer or shorter) it comes back. ... The top Hyundai Veloster Forum to discuss your favorite 3 door car including the Veloster Turbo and Veloster N, as well as check out users mods to ...I've got a 2016 Hyundai Accent hatchback 1.6L, and I've had the worst time with this P0420 code that has came on. It says Catalytic efficiency bank 1, and I'm not sure what to do to fix it. I've heard the Cat lasts like forever, so I'm hesitant to just replace it without finding the underlying issue.Bad gas cap or the purge valve which is part of the vacuum system is going bad and intermittently tripping the code. I just replaced this on my moms 2008 Jeep patriot last weekend for the same code. Problem solved for about $35. Use your OBD2 reader to clear the code and then drive it on the highway for about 30mi. So it has time to cycle the ...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. ⚠ Check if your Hyundai have …98 explorer codes p0420, p0174 Hello. 98 explorer with code P0420(catalyst system efficiency below threshold)(Bank1) and P0174 (System too lean)(Bank2) The explorer idles very rough in cold weather, dont want to stay running until it warms up. Also you hear it almost like misfiring every 30 seconds, it its more of a tick, an...20-FL-010H. Title: TUCSON 2.0L DTC P0420 - ECM UPDATE AND CATALYST REPLACEMENT. Date: 10/20/2020. Models: 2019Tucson. Summary: This bulletin provides information related to the repair of DTC P0420 "Catalytic Converter System Bank 1 - Efficiency Below Threshold" found stored in the Engine Control Module (ECM).What could cause the check engine light with code P0420 on a Hyundai or Kia? The check engine light with code P0420 on a Hyundai or Kia could be caused by a faulty oxygen sensor or catalytic converter. If the downstream oxygen sensor is functioning fine, the issue may point to a bad catalytic converter that needs replacement.Apr 3, 2018 ... Fix your Catalytic Converter for $10? Mike The Backyard Mechanic · 2.5M views ; EricTheCarGuy Explains Check Engine Codes - P0420 Catalyst System ...JOIN GASDIESEL GARAGE AS WE DIAGNOSE AND REPAIR THE MOST COMMON CHECK ENGINE LIGHT TROUBLE CODE P0420 Catalyst Efficiency Below Threshold Bank 1 SENSOR 2 ON...Many factors can cause the car computer to register DTC P0420 on Toyota or any car model. This makes it challenging to diagnose and fix the problem. Engine running rich or lean. Malfunctioning upstream or downstream oxygen sensor. Leaking fuel injectors. Lousy catalytic converter. Lousy engine coolant temp sensor.Or the sensor from your car into an Accent without any P0420 code. A conclusive test of the catalytic converter is to measure the temperature with an infrared thermometer at the inlet of the cat and at the outlet. Since the converter is burning leftover products of gas the temperature should be higher at the outlet than the inlet.this 2019 Hyundai Tucson has a p0420 code. im replacing a faulty manifold catalytic converterJOIN GASDIESEL GARAGE AS WE DIAGNOSE AND REPAIR THE MOST COMMON CHECK ENGINE LIGHT TROUBLE CODE P0420 Catalyst Efficiency Below Threshold Bank 1 SENSOR 2 ON...GET FIXD. What Does Code P0420 Mean? 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.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.76 posts · Joined 2021. #1 · Mar 23, 2022. Like the title says my Veloster is throwing the P0420 code every so often. It kinda comes and goes, like I'll clear it and after like a week or two (sometimes longer or shorter) it comes back. I'm worried it might be the catalytic converter, but I'm not getting any weird smells or sounds, no rough ...How to diagnose code P0420 on a Hyundai Elantra. 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 …Code P0420 Hyundai Description. 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.767 posts · Joined 2017. #2 · Apr 12, 2018. Warm Up Catalyst Efficiency Below Threshold Bank 1. Possible causes: - Catalytic converter deterioration or malfunction. - Exhaust system leaks. - Loose front or rear HO2Ss. - Faulty front heater O2 sensor. - O2 sensors harness is open or shorted.13 posts · Joined 2020. #1 · Sep 26, 2022. Hello everyone, I have 2012 Hyundai Accent and been receiving the P0420 code few times. It stays on for 2-3 days and then goes out automatically. I have noticed the code comes back after driving on a very hot day or after driving aggressively.I used to have a persistent P0171 and P0420 OBD-II set of codes pop up after about 81,000 miles. A friend suggested replacing the injectors. ... Hyundai Elantra Forum. 659.4K posts 30.2K members Since 2004 A forum community dedicated to Hyundai Elantra XD owners and enthusiasts. Come join the discussion about performance, …How to diagnose code P0420 on a Hyundai Santa Fe. 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 …2013 Hyundai Accent 255K miles. Runs great, still gets around 35 MPG. 40K miles ago I was having trouble with 420 code. Did usual tune up stuff and both O2 sensors. Ended up replacing the Cat with an aftermarket from Eastern Catalytic. I noted that the old one had no carbon or scale, I've seen very nasty Cats before.I had a car that would occasionally throw a P0420 code. The problem was a small leak in the exhaust near the second or post O2 sensor. ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona! Show Less . Full Forum …The P0420 code in the Hyundai Elantra refers to a diagnostic trouble code that indicates a potential problem with the catalytic converter. This code specifically …The code was P0420. I took it to Meineke, and they replaced the catalytic converter, as well as two oxygen sensors and two O2 sensors (this is according to the invoice also). It was fine for the last almost seven months, and then two days ago, the check engine light came back on with the same P0420 code. Parts and labor are warrantied for a ...P0430 Hyundai Code - Warm Up Catalyst Efficiency Below Threshold Bank 2 - Code Popularity: 49,884 Views - Repair Importance Level: 2/3 - Repair Difficulty Level: 2/3. Table of contents. Created and updated by William Orellana on Aug 20, 2020. Possible Causes; Tech Notes;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...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.P0420 code. Jump to Latest Follow. 601 views 4 replies 4 participants last post by Majestictobil Apr 3, 2024. Majestictobil Discussion starter. 4 posts · Joined 2021. #1 · Feb 11, 2024. I have a 2013 Hyundai accent and I replaced the cat 2 weeks ago because it was throwing a p0420 code and went into a limp mode and it’s throwing the same ...The P0420 code is a common diagnostic trouble code that indicates a problem with the catalytic converter in the Hyundai Santa Fe. When this code appears, it means that the catalytic converter is not functioning properly and is not effectively reducing emissions. The catalytic converter plays a crucial role in reducing harmful exhaust emissions ...Whyingo. 6.58K subscribers. Subscribed. 33. 6.6K views 5 months ago. Definition and Meaning Fixes Hyundai P0420 Diagnostic Trouble Code: Catalyst …Many factors can cause the car computer to register DTC P0420 on Toyota or any car model. This makes it challenging to diagnose and fix the problem. Engine running rich or lean. Malfunctioning upstream or downstream oxygen sensor. Leaking fuel injectors. Lousy catalytic converter. Lousy engine coolant temp sensor.P0420: jelentése, okai, javítások. A P0420 ODB2 hibakód katalizátorral kapcsolatos problémát jelez. A autó katalizátor feladata az égési ciklus során keletkező káros szennyező anyagok lebontása. A katalizátor a jármű kipufogógáz-tisztító rendszerének egyik eleme. Katalitikus átalakítónak is hívják.76 posts · Joined 2021. #1 · Mar 23, 2022. Like the title says my Veloster is throwing the P0420 code every so often. It kinda comes and goes, like I'll clear it and after like a week or two (sometimes longer or shorter) it comes back. I'm worried it might be the catalytic converter, but I'm not getting any weird smells or sounds, no rough ...Causes Of P0420 Hyundai Code The p0420 hyundai code is an indication of an issue with the catalytic converter. There are numerous reasons why this code might pop up. Faulty oxygen sensors, misfires, vacuum leaks, and exhaust leaks are just a few of the possible causes. Another factor that has an impact on the catalytic converter, is fuel additives.HYUNDAI Fault Codes DTC - Solaris, Accent, Santa Fe, Tucson, IX35, Starex, Elantra, Getz, Porter, Sonata. ... P0420 Code P0420 appears as a result of low catalyst throughput. If the device itself is whole, then the combination 0420 may be due to the use of low-quality fuel or the failure of the second oxygen regulator. To fix the problem, the ...Read more: OBD2 - OBDII Code P0420 HYUNDAI - Warm Up Catalyst Efficiency Below Threshold Bank 1 | Engine-Codes.com ... #5 · Dec 16, 2012. P0420 HYUNDAI Description The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module (PCM) compares the output … tucson 2.0l dtc p0420 -subject: ecm update and catalyst replacement tsb #: 20-fl-010h page 3 of 3 subject: ! rom id table: vehicle engine trans immo emissions ecu p/no. rom id old new tucson (tl pe) 2.0gdi 6at yes 39131ulev -2etf0 ggtl-inuaqs00c00 gtl-0nu0aq000c00 gtl-0nu0aq100c00 no ulev 39133 -2etf0 ggtl inuaps00c00 gtl 0nu0ap100c00 I've got a 2016 Hyundai Accent hatchback 1.6L, and I've had the worst time with this P0420 code that has came on. It says Catalytic efficiency bank 1, and I'm not sure what to do to fix it. I've heard the Cat lasts like forever, so I'm hesitant to just replace it without finding the underlying issue.2016 Elantra 1.8, P0420 only w/ new cat and O2's. I purchased a 2016 Elantra Limited 1.8 w/86k yesterday from a BHPH lot, so no warranty. I did a thorough inspection of the car and everything seemed good. I was allowed to test drive the car with no employee or salesperson. From start up to shutdown, test drive included, the engine …P0420. Afternoon, I've got the dreaded P0420 code. Gas mileage has gone down, now only 12-14 around town and used to be 15-17 before. It's a 2008 DGC SE with the 3.3 Flex Fuel and about 251,000 miles. I'm the original owner and the Cat has never been changed since new.P0420 HYUNDAI Code: Meaning, Causes, and Symptoms | OBD2 Codes. P0420 HYUNDAI – Warm Up Catalyst Efficiency Below Threshold Bank 1 . P0420: DIY Repairing Video TutorialExhaust leak. 1. Faulty Catalytic Converter. A P0420 code will most likely appear if your catalytic converter is malfunctioning. This is the case because the converter is in charge of converting toxic emissions into less harmful gases. As a result, if it's damaged, it might create a slew of problems with your vehicle.Read more: P0420 Hyundai - Warm Up Catalyst Efficiency Below Threshold Bank 1 Bank 1 O2 sensor is the on in the exhaust manifold and is imperative that you replace this. This O2 sensor is what determines air fuel ratios so only use an OEM sensor if possible. ... Actually, when you get the P0420 code its the downstream (after the CAT) …2017 Hyundai Accent Code P0420. Hello, and thanks in advance for your time! I recently got a CEL on my 2017 Hyundai Accent with 140,000 miles that came back as P0420 “Catalyst System Efficiency Below Threshold (Bank 1).”. I did some research online and the results varied from "It could be many different things don't spend your money on 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 …Code P0420 Hyundai Description Code P0420 for a Hyundai describes how the efficiency of the catalytic converter is determined by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module (PCM) uses output signals from both the front and rear oxygen sensors to determine whether the rear sensor’s output is beginning to ...2015 Elantra - P0420. My check engine light turned on and using my OBD2 i got code P0420 -Catalyst system efficiency below threshold (Bank 1) . I tested my O2 sensors and they are reading fine, Sensor one is jumping between .1 and .9 while O2 sensor 2 is holding steady at around 750 (between 735 -765). The CAT temps (front and back temp sensors ...The P0420 code is a generic powertrain code that appears in Hyundai Accent vehicles when there is a problem with the catalytic converter’s efficiency. It indicates that the catalytic converter is not performing as expected, leading to increased emissions. Causes of the P0420 code in Hyundai Accent.How to diagnose code P0420 on a Hyundai Elantra. 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 ...If the frequency ratio of front and rear HO2S is higher than threshold value, the PCM determines that a fault exists and the P0430 code is stored. Possible symptoms. - Engine Light ON (or Service Engine Soon Warning Light) P0430 Hyundai Description. The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon ...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...Code P0420 means “Catalyst system efficiency below threshold (Bank 1).” Driving long-term with this code can cause engine and exhaust system damage. The most common cause of P0420 is a bad catalytic converter, but it can also be caused by other issues, such as a faulty oxygen sensor, a rich or lean running condition, or misfires.I have a 2016 Hyundai Accent and my check engine light has a P0420 code. I am told I need a Catalytic converter. My question is would that be the rear or the one upfront with the manifold. Mechanic's Assistant: That code indicates a problem with the catalytic converter Is the check engine light blinking or flashing, or is it solid? When did you ...

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p0420 code hyundai

Here's how to bypass or trick the O2 sensor into thinking your catalytic converter is working when you have the P0420/P0430 check engine light code. May or m...13 posts · Joined 2020. #1 · Sep 26, 2022. Hello everyone, I have 2012 Hyundai Accent and been receiving the P0420 code few times. It stays on for 2-3 days and then goes out automatically. I have noticed the code comes back after driving on a very hot day or after driving aggressively.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 …6/25/2020: I got the P0420 code again. Oh, well--at least I had 7 good months! To add: ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona! Show Less .Hyundai Models. Elantra & Lantra Forums. XD (2001-2006) Elantra. P0420 code. Jump to Latest ...Here’s a good P0420 diagnostic order for the Hyundai Elantra: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Elantra 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.Code P0420 Hyundai Description. The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module ( …2016 Elantra 1.8, P0420 only w/ new cat and O2's. I purchased a 2016 Elantra Limited 1.8 w/86k yesterday from a BHPH lot, so no warranty. I did a thorough inspection of the car and everything seemed good. I was allowed to test drive the car with no employee or salesperson. From start up to shutdown, test drive included, the engine was running ...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...P0420 HYUNDAI Code: Meaning, Causes, and Symptoms | OBD2 Codes. P0420 HYUNDAI – Warm Up Catalyst Efficiency Below Threshold Bank 1 . P0420: DIY Repairing Video TutorialCost of the lockdown is $306 million a day for automakers. April was a washout month for India’s ailing auto industry. In a first, all major automakers, including Maruti Suzuki, Ma...The P0420 code on a Hyundai refers to a diagnostic trouble code that indicates a problem with the efficiency of the catalytic converter. The code specifically …I've been getting periodic P0420 Check Engine codes on Bank 1. Upon some research, many are of the opinion that this 1 (of the 3) catalytic converters going bad. ... Hyundai Forum is a community for all Hyundai Owners to talk and learn all about their favorite subject: Hyundai cars from the Sonata to the Elantra and even the new Kona!P0420. Afternoon, I've got the dreaded P0420 code. Gas mileage has gone down, now only 12-14 around town and used to be 15-17 before. It's a 2008 DGC SE with the 3.3 Flex Fuel and about 251,000 miles. I'm the original owner and the Cat has never been changed since new.Although they both use an “H” as their company logo, Honda and Hyundai are different companies based out of different countries. Honda is based out of Japan, whereas Hyundai is bas...Jay Safford. Automotive Mechanic. 16 years of experience. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. I suggest you have a mechanic like one from YourMechanic do a complete diagnostics of …A logged P0463 code means that a high voltage signal is detected from the fuel level sensor, resulting in inaccurate fuel gauge readings. A faulty fuel level sensor circuit or sending unit, damaged body computer, PCM issues, and a faulty smart fuse box are common reasons why this code is triggered. Aside from inaccurate fuel level ….

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