Chevy sonic p0420 - P2097 Chevrolet Code - Post Catalyst Fuel Trim System High Limit Bank 1 - Code Popularity: 27,261 Views - Repair Importance Level: 3/3 - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on …

 
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P0324 is a common OBD2 trouble code. It indicates that there is an issue with your Chevy Sonic's knock control system. While P0324 is a generic code, repair steps will vary depending on your Sonic's engine type and model year. However, some basic steps can be followed to help diagnose and fix the problem. P0324The first thing you should do is go to Chevy's site and punch your VIN into the warranty checker. Many years of Sonics had their emissions warranty extended to 15yr/150k. If yours is one of them, you can get any emissions issues corrected under warranty. Reply. [deleted] • 10 mo. ago.Fix code p0420 on chevrolet cruze, chevy sonic catalyst system. Chevy p0420 code cruze p0442 express pilot p0430 honda trouble tacoma system causes catalyst efficiency threshold below cause many thingsP0420 chevy cruze: catalyst system efficiency below threshold 2013 chevy cruze lt 1.4 turbo i have code p0420. i’ve changed the bank.. 2013 ...Sep 7, 2023 · The code P0420 on your 2016 Chevrolet Sonic LT indicates that the catalytic converter is not working properly. However, the fact that the converter is only a few months old makes it less likely to be the culprit. Here are some other things that could be causing the code:A bad oxygen sensor. June 23, 2021 by Jason. P219A is a generic OBDII code. The code indicates that your Chevy Sonic’s air/fuel ratio is out of balance (too rich or too lean). Your Sonic is equipped with oxygen sensors that measure the air-fuel ratio of your engine. It’s these sensors that are reporting the problem with the air-fuel ratio.XjJunky. I just went through this, you can try cleaning them but very good chance your just going to need a new cat. If your mechanically savvy just pop the cat off and have a look, or if you have a good endoscope pull your o2 sensor out and have a look that way. Mine was melted inside. Also a 2012 with 180xxx miles on mine.Some check engine codes, including the P0420, can mean you have a leaky exhaust. Check for leaks before you go swapping parts. Finding the leak is easy and f...2014 chevy sonic with p0420 code that won't go away. Thanks for posting on r/MechanicAdvice! This is just a reminder to review the rules. If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's post on the subject. and remember to please post the year/make/model of the vehicle you are ...Tech Notes. 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 (it 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 ... If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows: Open TIS on the computer used to program the vehicle. Select and start SPS. Select Settings. Select the Warranty Claim Code tab. The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. Mar 2, 2022 · 1. Replace the exhaust front pipe and the warm up three-way catalytic converter. NOTE: A new converter with less than 100mi on it may set the P0420 DTC due to outgassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition." Aug 16, 2022 · P0324 is a common OBD2 trouble code. It indicates that there is an issue with your Chevy Sonic's knock control system. While P0324 is a generic code, repair steps will vary depending on your Sonic's engine type and model year. However, some basic steps can be followed to help diagnose and fix the problem. P0324 Related: P0420 Chevy Sonic Chevy Sonic P0496 Symptoms P0496 code in the Chevy Sonic will often be accompanied by an. One of the most common trouble codes with the Chevy Sonic is the P0496 code. This code number references a number that is given to you when you plug your Sonic into an OBDII scanner. Related: P0420 Chevy …2. Enter the VIN in the parts catalog and go to the fuel injector rail parts section. 3. After the injector part number has been identified on the body of the injector, in the description column. For example, part number 12668390 highlighted in the table. To the left is the part number that will need to be order.Sonic tooling technology is a groundbreaking advancement that is changing the manufacturing industry. This innovative technology uses high-frequency vibrations to improve the effic...P0300 is a generic OBDII code that can occur with the Chevy Sonic. This code indicates that your car’s engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). If you have P0300 and a cylinder-specific misfire, the ...I have a 2016 Chevy sonic. P0420 code for over a year now, replaced both upstream and downstream O2 sensors and replaced the catalytic converter (OEM) and check engine light with this code keeps coming on. Mechanic said he checked for leaks before replacing cat, I asked to check the manifold also, he said he checked it all.I have a 2016 Chevy sonic. P0420 code for over a year now, replaced both upstream and downstream O2 sensors and replaced the catalytic converter (OEM) and check engine light with this code keeps coming on. Mechanic said he checked for leaks before replacing cat, I asked to check the manifold also, he said he checked it all.Sonic booms are rarely heard because they are produced by jets exceeding the speed of sound, and jets are no longer permitted to reach those speeds. Jets flying at certain speeds c...The coolant gauge problem is probably unrelated to the p0420 or the sluggish shifting. If the computer’s temp sensor failed (the one not related to the gauge), that might cause drivability symptoms, but seems unlikely. First b/c those sensors are simple thermistors and rarely fail.Chevy equinox p0013: “b” camshaft position → open/short ocv → bank 1Equinox chevy 4l Cargurus equinox chevrolet engine removal answersP0420 chevy equinox issue and solutions to fix properly. FIX CODE P0420 ON CHEVROLET CRUZE, CHEVY SONIC Catalyst System. Check Details. Fix code p0420 on chevrolet cruze, …The upstream O2 sensors sense that it’s lean and tells the computer to richen up the fuel. This causes excess wear on your catalytic converter, which is probably integrated with your exhaust manifold. It also could be your O2 sensor. In either case, you need a new catalytic converter and you probably need a new downstream air intake pipe ...CHEVROLET SONIC 1.8 CHEVROLET CRUZE 1.8THIS VIDEO GIVES A FEW TIPS ON REPLACING THE KNOCK SENSOR (OBD2 CODE P032). THE JOB IS NOT THAT DIFFICULT (3/10) IF Y...If you drive an Buick Encore, Chevy Sonic or a Chevy Cruze and have these codes p015B p0171 p1101, check your purge valve and watch this video. Billy walks y...Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test.The P0420 code is thr...A week ago the engine light came on in my 2011 6spd Eco Cruze. I stopped at an AutoZone and they read the code P0420. I took it to my mechanic and they confirmed my fear. Needed a new catalytic converter. Got the work done and got it back. After about 25 miles of driving light came back on. I dropped it off with my mechanic again.Hesitation When Shifting Gears. The most common Sonic transmission problem is hesitation while shifting gears. A version of the Sonic exists with a manual transmission, but this problem is only prevalent with the automatic version. The problem starts to present itself around 30,000 miles of driving. Drivers of automatic Sonics …P0420 code "catalytic converter." I've had no loss of power, no acceleration issues, no signs at all that my cat was out. When I scanned over sonic forums, the general consensus is to change out the upstream o2 sensor, then the downstream one if that doesn't fix it, then spark plugs, then coolant thermometer, THEN the cat.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...Replacing speakers in a vehicle is one of the simplest and most cost-effective ways of improving the sound in your car. The Chevrolet Colorado is a good candidate for speaker repla...The first thing you should do is go to Chevy's site and punch your VIN into the warranty checker. Many years of Sonics had their emissions warranty extended to 15yr/150k. If yours is one of them, you can get any emissions issues corrected under warranty. Reply. [deleted] • 10 mo. ago.Overview of the causes and fixes of a Chevy Cruze P0299 “Turbo/Super Charger Under Boost.” error code.Read here for more information: https://www.backyardme...The most common fix for P0420 in the Chevy Spark is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Spark 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 Chevy Spark: 1. Check for Other Codes.Bypass Valve Solenoid - P2261 [SOLVED] For a 2014 Chevrolet Cruze 1.4l Turbo. Recently we took it to a shop for the code P2261, turbocharger bypass valve. The shop said that they compressed air into the air intake and it would not hold. So, they said the turbo would not kick in if the intake isn’t building pressure. P0420 Catalysis System Efficiency. I financed a 2014 Chevy Sonic in May, 89,000 miles. I recently had a light come on my dash, and it read P0420. I need to get my front catalyst converter replaced, and the quotes I’ve gotten are all over the place. Basically anywhere from $700-$3,000. May 21, 2021 · So, he Reset the CEL and I drove away two days later my light returns on again and now I check my Codes today and see both the P0299 under boost from turbo and P0420 catalytic converter low efficiency below threshold from bank 1. I have replaced sparkplugs with acdelco that were OEM parts, also the ignition coils, oil change with full synthetic ... Mar 14, 2024 · 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 ... The coolant gauge problem is probably unrelated to the p0420 or the sluggish shifting. If the computer’s temp sensor failed (the one not related to the gauge), that might cause drivability symptoms, but seems unlikely. First b/c those sensors are simple thermistors and rarely fail.Detailed information on the P0420 dtc trouble code. Includes why it happens and how to fix your car. Trouble Code - P0420 Catalyst System Efficiency Below Threshold (Bank 1) ... I have 2003 Chevy avalanche with P0420 code and the motor is running rough shouod I change the rear o2 sensor or the cat #276 - Andrew swanson - 10/14/2012 - …This page is meant to help you troubleshoot the Chevy Monte Carlo 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.Possibly, but there is no code related to Chevy p2076. The po420 has to do with the catalytic converters....Possible causes: Three way catalyst converter Bank 1, Exhaust tube, Intake air leaks, Fuel injectors may be faulty, Fuel injector leaks, Spark plugs may be faulty, Improper ignition timing, Powertrain Control Module (PCM)...As the code …A prevalent issue with the Chevy Sonic is the P0446 code. This code corresponds to a specific number obtained when connecting your Sonic to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard …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...Forgot to mention if any of you out there need new catalytic converters for your chevy cruze that ZZPerformance has a catless downpipe and high flow catted m...I am showing here how i tackle another problem at the shop to the fastest and quickest way. I still advice to consider other techniques to confirm your diagn...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 …Sep 13, 2565 BE ... ... Chevrolet Cruze 2012 Chevrolet ... How to Change Catalytic Converter Chevrolet Cruze 2011-2015 / Chevrolet Sonic 2012-2016 ... CHEVY CRUZE | P0420 | .....1378 posts · Joined 2014. #3 · Feb 18, 2021. P0420 is often the sign of a failed cat. Since the O2 sensors have been replaced this is much more likely. Since you also have a P0299, this is likely the cause of the failed cat. You need to determine what caused the P0299, could be an air leak, turbo problems.Codes: (MOST CURRENT CODES AS OF RIGHT NOW) P2097: Post catalytic converter fuel trim (FT) bank 1- too rich. P0420: Catalytic converter system, bank 1 -efficiency below threshold. Exact Chevy Diagnosis: CAUSE: ENG replaced valve cover, customer declined spark plugs, advised converter may have been damaged also.The P0420 code in a Chevrolet will often be thrown one of your oxygen sensors are not functioning properly. Typically, the code will be triggered by the …CHEVROLET CRUZE SONIC CODE P0441 P0442 FIX CHEVY CRUZE SONIC EVAP, HOLDEN CRUZEIn this video we will show you what causes code P0441 and CODE p0442 on Chevro...Popular Engine Codes P0420 P0172 P00171 P0128 P0300 P0456 P0430 P0442 P0455 P0113. ... code keeps poping up on my car i changed the vvt solenoid but i still have this light coming on and off i have 2015 chevy sonic any ideas? Reply. Matt says: July 21, 2019 at 11:16 pm. Got this code on my girlfriends car. Checked the oil it was low.May 30, 2018 · 27 posts · Joined 2018. #1 · May 30, 2018. Hey guys, first post here. My wife has a 14 cruze with the 1.4 and yesterday the check engine light came on. She ran it by a dealer and it came up with the 0420 code with the catylist system low efficiency. I did a fee searches and came up finding several had this issue, but never saw a for sure culprit. 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 ...Buy Now!New Catalytic Converter from 1AAuto.com http://1aau.to/ic/1ACCD00436This video shows you how to install a front catalytic converter on your 2011-2015...Code P0420 Chevrolet Description. A 3-way catalyst controls emissions of hydrocarbons, Carbon Monoxide (CO), and Nitrogen Oxide (NOx). The catalyst within the converter promotes a chemical reaction, which oxidizes the hydrocarbons and the CO that are present in the exhaust gas. This process converts the hydrocarbons and the CO into water vapor ...The great American sports car is going electric. GM shared the news this morning, and released the first images of the upcoming electric Chevrolet Corvette. The great American spor...Car shoppers, take note: The Chevy Volt has received a $4,400 price cut amid low sales and a new model. By clicking "TRY IT", I agree to receive newsletters and promotions from Mon...If you have a 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, or 2019 Chevy Cruze or Chevy Sonic, and your engine is running rough and you have a check engin...Aug 14, 2564 BE ... P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) How to replace the upstream oxygen sensor on a 2011-2018 Chevrolet Cruze ...FIX CODE P0010 P0011 P2089 CAMSHAFT POSITION ACTUATOR CHEVY, CHEVROLET, BUICK, GMC, CADILLAC Car Scanner: https://amzn.to/2G5lxTi Check out our Amazon Stor...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...Bypass Valve Solenoid - P2261 [SOLVED] For a 2014 Chevrolet Cruze 1.4l Turbo. Recently we took it to a shop for the code P2261, turbocharger bypass valve. The shop said that they compressed air into the air intake and it would not hold. So, they said the turbo would not kick in if the intake isn’t building pressure.1. Replace the exhaust front pipe and the warm up three-way catalytic converter. NOTE: A new converter with less than 100mi on it may set the P0420 DTC due to outgassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition."2014 Need help: codes P0420 & P2097. Hi all. Hoping to get some help and avoid multiple costly trips to the dealership for service. My wife’s 2014 Volt started smoking from the exhaust last week on her way home from work and the check engine light came on. The communication center read “propulsion power is reduced “ and “engine not ...Accordingly_ • 1 yr. ago. I'm not sure why it wouldn't let me add more info. I have had my catalytic converter replaced twice, o2 sensor, exhaust flex pipe, ignition coil pack and spark plugs replaced. Three days after the last repair, my check engine came back on, same code. I haven't been able to get it back in yet. 1.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 ...Some check engine codes, including the P0420, can mean you have a leaky exhaust. Check for leaks before you go swapping parts. Finding the leak is easy and f...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... If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows: Open TIS on the computer used to program the vehicle. Select and start SPS. Select Settings. Select the Warranty Claim Code tab. The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. P0420 Code. How to fix it. Don't spent tons of $$$. ~This also true for the po430 Code!Check out My Amazon Auto Accessories Store! Lets make that Weekend job...Mar 21, 2024 · If you experience a P0420 code in your Chevy, it is often due to an exhaust leak before the catalyst. It can also be caused by a faulty downstream oxygen sensor (rear) or a faulty catalytic converter. Jan 18, 2559 BE ... CHEVY CRUZE CHECK ENGINE LIGHT P2097 P0420 & P0324 DIAGNOSIS ... How to Change Catalytic Converter Chevrolet Cruze 2011-2015 / Chevrolet Sonic ...Sep 13, 2565 BE ... ... Chevrolet Cruze 2012 Chevrolet ... How to Change Catalytic Converter Chevrolet Cruze 2011-2015 / Chevrolet Sonic 2012-2016 ... CHEVY CRUZE | P0420 | .....October 13, 2022 by Jason. P0011 is a common (and serious) OBD II diagnostic trouble code that can occur in the Chevy Sonic. It indicates an issue with your car’s Variable Valve Timing (VVT) system. The first thing you should do when you have this code is check your Sonic’s oil. If the oil level is too low, the camshaft actuators won’t ...I am showing here how i tackle another problem at the shop to the fastest and quickest way. I still advice to consider other techniques to confirm your diagn...I made a quick video to explain the P0299 underboost code that you'll find on various turbo engines. While there are some application-specific explanations, ...June 23, 2021 by Jason. P219A is a generic OBDII code. The code indicates that your Chevy Sonic’s air/fuel ratio is out of balance (too rich or too lean). Your Sonic is equipped with oxygen sensors that measure the air-fuel ratio of your engine. It’s these sensors that are reporting the problem with the air-fuel ratio.Hesitation When Shifting Gears. The most common Sonic transmission problem is hesitation while shifting gears. A version of the Sonic exists with a manual transmission, but this problem is only prevalent with the automatic version. The problem starts to present itself around 30,000 miles of driving. Drivers of automatic Sonics …Reason For This Recall: On certain 2013-2014 model year Chevrolet Cruze and Sonic vehicles equipped with a 1.8L engine, cracking of ceramic components internal to the catalytic converter may occur as a result of higher than anticipated exhaust temperatures. If this occurs the catalytic converter low efficiency diagnostic will set and theThe most common fix for P0420 in the Chevy Spark is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Spark 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 Chevy Spark: 1. Check for Other Codes.Code P0420 Chevrolet Description. A 3-way catalyst controls emissions of hydrocarbons, Carbon Monoxide (CO), and Nitrogen Oxide (NOx). The catalyst within the converter promotes a chemical reaction, which oxidizes the hydrocarbons and the CO that are present in the exhaust gas. This process converts the hydrocarbons and the CO into water vapor ...The bank 1 version of this code is P0420. Chevy Sonic P0430: Symptoms. The P0430 code in a Chevy Sonic will often be thrown if one of your car’s oxygen …The P0420 code points to “Catalyst System Low Efficiency” and signals that oxygen levels are below the desired threshold on bank 1, based on readings from the …

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 .... Ft wayne obituaries

chevy sonic p0420

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. …It’s official: a fully electric Chevy Corvette is coming — with new battery technology to boost its range, acceleration and efficiency. When it arrives, the battery-electric sports...The bank 1 version of this code is P0420. Chevy Sonic P0430: Symptoms. The P0430 code in a Chevy Sonic will often be thrown if one of your car’s oxygen …Te suministramos todo lo que necesitas saber sobre el código DTC P0420: ️ Descripción, ️ causas, ️ síntomas y ️ posibles soluciones.LEER SOLUCIÓN DEL CÓD...2014 Need help: codes P0420 & P2097. Hi all. Hoping to get some help and avoid multiple costly trips to the dealership for service. My wife’s 2014 Volt started smoking from the exhaust last week on her way home from work and the check engine light came on. The communication center read “propulsion power is reduced “ and “engine not ...The 2020 Chevrolet Silverado is a fabulous choice if you’re searching for a reliable full-size pickup truck. Why? Because the Silverado is ranked in third place on the US News site...Edmunds' expert review of the Used 2020 Chevy Sonic provides the latest look at trim-level features and specs, performance, safety, and comfort. At Edmunds we drive every car we review, performing ...Chevrolet Sonic 2013 Sonic LT pac E 1.6L 115hp 175000 kms Luz de ABS Código P0420 Código P0171 Código P0106 Al encender el auto marca el testigo del agua, y cuando paro en algún semáforo se enciende el foco de abs y pues tiene el del xheckingine encendido siempre lo escanearon y marca los sig codigosHere'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...I have a 2016 Chevy sonic. P0420 code for over a year now, replaced both upstream and downstream O2 sensors and replaced the catalytic converter (OEM) and check engine light with this code keeps coming on. Mechanic said he checked for leaks before replacing cat, I asked to check the manifold also, he said he checked it all.CHEVROLET CRUZE SONIC CODE P2135 THROTTLE PEDAL POSITION SENSOR FIX, CHEVY CRUZE SONIC Throttle Body (1.4 Engine): https://amzn.to/2u9kyz0 Throttle Body (...Having issues getting rid of the P0420 or any other code. This video may be the answer.XjJunky. I just went through this, you can try cleaning them but very good chance your just going to need a new cat. If your mechanically savvy just pop the cat off and have a look, or if you have a good endoscope pull your o2 sensor out and have a look that way. Mine was melted inside. Also a 2012 with 180xxx miles on mine.Gm’s 1.4L turbocharged 4-cylinder engine, commonly found in the Chevy Sonic, Cruze and Buick Encore, has a well-known issue resulting in a lean code, P0171, ...Feb 18, 2021 · 1378 posts · Joined 2014. #3 · Feb 18, 2021. P0420 is often the sign of a failed cat. Since the O2 sensors have been replaced this is much more likely. Since you also have a P0299, this is likely the cause of the failed cat. You need to determine what caused the P0299, could be an air leak, turbo problems. This page is meant to help you troubleshoot the Chevy Avalanche 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. …Sep 7, 2023 · The code P0420 on your 2016 Chevrolet Sonic LT indicates that the catalytic converter is not working properly. However, the fact that the converter is only a few months old makes it less likely to be the culprit. Here are some other things that could be causing the code:A bad oxygen sensor. A P0420 code indicates a problem with the catalytic converter. The purpose of the catalytic converter is to break down harmful pollutants created during the combustion cycle. By using fine platinum and gold meshes to filter …Replacing speakers in a vehicle is one of the simplest and most cost-effective ways of improving the sound in your car. The Chevrolet Colorado is a good candidate for speaker repla...Possibly, but there is no code related to Chevy p2076. The po420 has to do with the catalytic converters....Possible causes: Three way catalyst converter Bank 1, Exhaust tube, Intake air leaks, Fuel injectors may be faulty, Fuel injector leaks, Spark plugs may be faulty, Improper ignition timing, Powertrain Control Module (PCM)...As the code …It certainly wasn't clogged, the honeycomb looked good, seemed to have good airflow, but it didn't resolve the p0420 issue. Since then I've changed the spark plugs with the preferred NGKs, factory gaps (double-checked) as well as the air filter. I used about a half-can of CRC Industries Intake valve cleaner directly in the throttle body, spray ....

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