P0420 chevrolet equinox

So my check engine light came on and I was able to pull a code P0420 Catalyst system low efficiency. Now I know this could mean a bad cat, bad O2 sensor(s) or even a crack in the manifold. I have a 2011 Chevy Equinox 2.4L with a little over 80k on it. Does anyone know if there is a common fix for...

How To Diagnose Trouble Code P0420: Catalyst Efficiency Below Threshold (Bank 1). TEST 1: Checking For a Broken Catalytic Converter. TEST 2: Checking The Output Of The Rear Oxygen Sensor. TEST 3: Manually Inducing A Lean Condition. TEST 4: Manually Inducing a Rich Condition.Chevrolet P0420 Trouble Code. The Chevy Cobalt, Malibu, Equinox, and Silverado pickups are prone to P0420. On these vehicles, trouble accelerating and reduced MPG accompany the code. Upstream oxygen sensors need frequent replacement. Eventually, the cat also requires replacement after 5-7 years of use.The base price of the 2020 Escape is just over $1,000 higher than that of the 2020 Equinox, at $26,080. Ford allows buyers to spec all-wheel drive (for $1,500) on its base model while Chevrolet ...The P0299 code results from low air pressure coming to the turbine of the turbocharger. The problem can be vacuum leaks, EGR issues, a damaged turbo, or a problem with the boost pressure sensor. The result is that the engine will not accelerate as it should. Depending on the vehicle, the ECU may even trigger a limp mode.Chevy Equinox Generations Forum. 2nd Gen : 2010-2017 Chevy Equinox. 2010-2017 Equinox Maintenance . P1133 Help! Thread starter bsinischo; Start date Aug 23, 2020; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. ...Support Small Business! Please Subscribe/Donate https://bit.ly/3lQp0aNChevy Equinox Engine Power is Reduced SolvedIn this we are going to show you a possib...Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) …

GM is adding an electric Chevrolet Silverado pickup truck to its lineup, as the automaker pushes to deliver more than 1 million electric vehicles globally by 2025. GM President Mar...Best-selling cars from Chevrolet come in all shapes and sizes, including the small and sporty Equinox SUV, the larger mid-size Traverse with its three rows of seating and the comfo...P0121 Definition. P0121 will trigger in your Chevy Equinox if it’s TPS “A” circuit has an output voltage that goes above or below the sensor’s normal operating range. It’s a general powertrain code, which means that it has the same meaning regardless of who manufactured the vehicles (1996+).Oct 19, 2021. Messages. 210. Reaction score. 25. ok i have the 2013 equinox nd i get the p0420 code all day long. i know why because the engine burned so much oil i had to have a refinery in the backyard to keep up. anyway because we do not live in a test state i drilled out the cat so the engine could breath after i rebuilt the engine.in this video I'm gonna share with you how to diagnose and fix DTC P0011 - P0014 & P0013 on a Chevrolet Equinox! #vvtsolenoidIn this video I bring you along as I have a look at a customers Chevy equinox with the classic P0010 Intake cam position solenoid control circuit. It is a ve...13 Jan 2018 ... 2012 chevy equinox oxygen sensor replacement. 103K views · 6 years ago ...more. Uriel Rios. 476. Subscribe.

P0300 is a generic OBDII code that can occur with the Chevy Equinox. This code indicates that your vehicle’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 ...I have 2012 Chevy Equinox 2.4, I had a P0420 and I changed the Converter 3 times with both 02 sensors, and 7-10 days later the light comes on. Any ideas to what it could be causing it. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? Engine light, and gives the codes p0420Sep 7, 2017 · 2012 Chevrolet Equinox 135,000miles. 2.4L. P0420 Keeps coming back. I have an up to date snap scanner and can read any information needed. I need to troubleshoot to find the problem. I am looking for someone that has done this before. Answered in 6 minutes by: Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) …WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC, BUICK. Check Details. Top Check Engine Trouble Codes 2010-2017 Chevy Equinox SUV - YouTube. Check Details. Chevy Equinox P0014: Camshaft Position B → Over Advanced → Bank 1. Check Details. 2012 Chevrolet Equinox 135,000miles 2.4L P0420 …WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC, BUICK, CADILLAC Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon Store for the to...

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3 Answers. Sorted by: 2. P0420 is probably the most common code seen. It refers to "Catalytic Converter Efficiency" Basically, it Engine Control Module (ECU) …Possible Causes. NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. Faulty Three-way …22 Jul 2020 ... Subscribe to not miss a video from PS AUTOMOTIVE ▻ https://bit.ly/35YP5Oe Chevy Equinox P0137 Oxygen Sensor Replacement & Location Tutorial ...P0121 Definition. P0121 will trigger in your Chevy Equinox if it’s TPS “A” circuit has an output voltage that goes above or below the sensor’s normal operating range. It’s a general powertrain code, which means that it has the same meaning regardless of who manufactured the vehicles (1996+).

Visit me at: http://www.ericthecarguy.com/O2 Sensor Video: https://www.youtube.com/watch?v=NIzcztO-CCsDiscussion about this video: http://www.ericthecarguy...3 Answers. Sorted by: 2. P0420 is probably the most common code seen. It refers to "Catalytic Converter Efficiency" Basically, it Engine Control Module (ECU) …2004 - 2015 Chevrolet Avalanche, Express, Silverado, Silverado Hybrid, Suburban, Tahoe, Tahoe Hybrid 2004 - 2015 GMC Savana, Sierra, Sierra Hybrid, Yukon, Yukon Hybrid ... If the diagnostics for DTC P0420 and P0430 have passed, return the vehicle to customer for evaluation. If the diagnostics do not pass, perform SI diagnostics and repair as ...Jan 4, 2020 · 2012 Chevy equinox 2.4L at about 135K miles threw a fan belt about 6 months ago on a road trip. Limped it to a dealership for fanbelt replacement and they said the timing chain was making a lot of noise and need replaced too. So I got it back home and had a shop do the timing chain with new tensioners and guide vanes as well as new water pump. P0446 Definition. P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it’s a Equinox or not. Here’s its technical definition: P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction. In layman’s terms, P0446 indicates a problem with the EVAP system vent control valve.B. BigCountry24 Discussion starter. 2 posts · Joined 2024. #1 · Jan 12, 2024. Equinox started throwing a P0299 underboost fault, and goes into limp mode and wont get out of its own way. Clear the fault and boost comes back and runs fine temporarily, then resets the same P0299. Drove it with my scanner on it and for some reason its not making ...Follow my Builds / Projects: www.youtube.com/c/patrickkasilag?sub_confirmation=1Quick video on how to change bank 1 sensor 1 oxygen sensor on a 2015 chevy eq...P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Equinox. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause …Jul 26, 2018 · P0420 Diagnosis: Chevy Silverado. The most common fix for P0420 in the Chevy Silverado is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Silverado 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 ... 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 …Clear the code and test drive the vehicle. See if the P0014 code returns. If it does, replace the exhaust camshaft solenoid actuator. Clear the code. Test drive the vehicle. If the code returns, the timing chain needs to be replaced. The only way to get rid of the P0420 code is to replace the catalytic converter. Ask Your Own Chevy Question.6 Jul 2023 ... Causes and Fixes Chevrolet P0420 Code ... 2013 Chevrolet Cruze P0420 Check Engine Code Easy Cheap Fix ... 2010-2014 CHEVY EQUINOX 2.4 LT| HOW TO ...

How to Fix CHEVROLET P0420 Engine Code in 3 Minutes [3 Methods / Only $19.99] - YouTube. nonda. 91.7K subscribers. Subscribed. 553. 123K views 3 years ago …

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 …How to Fix CHEVROLET P0420 Engine Code in 3 Minutes [3 Methods / Only $19.99] - YouTube. nonda. 91.7K subscribers. Subscribed. 553. 123K views 3 years ago …Código P0420: significado, síntomas, causas (soluciones fáciles) Entre las causas, la más frecuente del código P0420 es por un convertidor catalítico averiado. Igualmente puede deberse por un sensor O2 en mal estado, una fuga de escape, fuga de admisión o ubicación errónea del convertidor catalítico. Otra causa, sería un convertidor ...Memberships to Equinox Fitness cost in the range of $155 per month for a single club to $195 per month for an all-access, world-wide pass. Signing up for a membership requires payi...2004 - 2015 Chevrolet Avalanche, Express, Silverado, Silverado Hybrid, Suburban, Tahoe, Tahoe Hybrid 2004 - 2015 GMC Savana, Sierra, Sierra Hybrid, Yukon, Yukon Hybrid ... If the diagnostics for DTC P0420 and P0430 have passed, return the vehicle to customer for evaluation. If the diagnostics do not pass, perform SI diagnostics and repair as ...Usually, when you have a code P0420, the check engine light will come on, and your vehicle may remain completely drivable. However, these symptoms may also appear: Loss of power, even after warming your vehicle up. Slow acceleration or inability to increase speed over 30-40mph. Sulfurous smell from the exhaust pipe.2012 Chevy equinox 2.4L at about 135K miles threw a fan belt about 6 months ago on a road trip. Limped it to a dealership for fanbelt replacement and they said the timing chain was making a lot of noise and need replaced too. So I got it back home and had a shop do the timing chain with new tensioners and guide vanes as well as new water pump.The CEL lit up a few weeks ago with the first code, P0420, the Catalytic Converter Bank 1 was below the efficiency threshold. Then yesterday, I left the house for a quick errand in the morning, and the car stalled and started giving me the Engine Power Reduced and Stabilitrak System message in the DIC. ... Chevy Equinox, and Cadillac …

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Top Answer. Ryan S. December 28, 2020. The Chevy Equinox did have a recall and common problem that lead to the Exhaust manifold to crack near the O2 sensor and would leak exhaust through the HVAC system of the vehicle. You can get the issue repaired by the dealership if it falls into their specified category of models that are …I have 2012 Chevy Equinox 2.4, I had a P0420 and I changed the Converter 3 times with both 02 sensors, and 7-10 days later the light comes on. Any ideas to what it could be causing it. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? Engine light, and gives the codes p0420The base price of the 2020 Escape is just over $1,000 higher than that of the 2020 Equinox, at $26,080. Ford allows buyers to spec all-wheel drive (for $1,500) on its base model while Chevrolet ...Cost to Drive Cost to drive estimates for the 2020 Chevrolet Equinox L 4dr SUV (1.5L 4cyl Turbo 6A) and comparison vehicles are based on 15,000 miles per year (with a mix of 55% city and 45% ...How To Diagnose Trouble Code P0420: Catalyst Efficiency Below Threshold (Bank 1). TEST 1: Checking For a Broken Catalytic Converter. TEST 2: Checking The Output Of The Rear Oxygen Sensor. TEST 3: Manually Inducing A Lean Condition. TEST 4: Manually Inducing a Rich Condition.24 Sept 2019 ... converter: https://amzn.to/39lz3Be P0420 Check engine light how to fix it yourself. This car is a 2009 Chevy Malibu but the code and problem ...Feb 6, 2023 · P0172 is a diagnostic trouble code (DTC) that indicates a fuel system rich condition in the Chevy Equinox. The code is triggered when the powertrain control module (PCM) detects a fuel-to-air ratio that is too rich for efficient engine operation. This condition can be caused by a variety of factors, and it is important to identify and repair ... There is a p0420 thread on the acadia forum now. 2023 Traverse LT 3.6L 15,000. 2013 Equinox 3.6L 121,000. 2003 Trailblazer 4.2L 188,000. 2010 Traverse 3.6L 193,000. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread. 2023 TrailblazerSTARTING AT: $22,100†AS SHOWN: $27,425†. Make a huge impression with the 2024 Chevy Equinox small SUV equipped with a 1.5L turbocharged engine, standard Chevy Safety Assist, and a details-focused interior. P0420 chevy equinox issue and solutions to fix properlyP0420 cruze catalyst threshold 2014 chevy equinox, just had brand new engine put in in and new o22015 chevy equinox 2.4l code p0172, p0300, p0420 high pressure …I have 2012 Chevy Equinox 2.4, I had a P0420 and I changed the Converter 3 times with both 02 sensors, and 7-10 days later the light comes on. Any ideas to what it could be causing it. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? Engine light, and gives the codes p0420 ….

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...The Chevrolet Lumina was a value-priced family sedan, but it was outsold by its midsize competition. Learn more about the Chevrolet Lumina. Advertisement The Chevrolet Lumina wasn'...The Chevrolet Cavalier proved that America could compete with the imports, reporting top sales numbers each year. Learn about the Chevy Cavalier. Advertisement The four-cylinder en...October 25, 2022 by Jason. P0010 is a relatively common trouble code. It affects vehicles with variable valve timing (VVT). The list of VVT vehicles is growing, and the Chevy Equinox can have VVT and is prone to developing this code. P0010 is often by low or sludgy oil. Check your Equinox’s oil as soon as possible. P0010 is a generic OBDII …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 - 15:52.in this video I'm gonna share with you how to diagnose and fix DTC P0011 - P0014 & P0013 on a Chevrolet Equinox! #vvtsolenoid22 Jul 2020 ... Subscribe to not miss a video from PS AUTOMOTIVE ▻ https://bit.ly/35YP5Oe Chevy Equinox P0137 Oxygen Sensor Replacement & Location Tutorial ...21 Mar 2023 ... HOW TO REPLACE CATALYTIC CONVERTER | CODE P0420 | 2002 CHEVY ASTRO VAN 4.3 | DIY ... Chevy Equinox 2.4L Catalytic Converter Replacement. The ...Síntomas del código P0420 de la Chevy Equinox. El código P0420 en un Chevy Equinox a menudo será lanzado uno de sus sensores de oxígeno no están funcionando correctamente. Normalmente, el código será lanzado por el sensor de oxígeno upstream (antes del convertidor). No suele haber problemas de conducción asociados a P0420. P0420 chevrolet equinox, Feb 23, 2022. #1. Wife's 2013 Equinox 2.4 has had a recurring P0411 secondary air injection low flow code for about a year. Googling turns up that this is yet another delightful feature of the Ecotec 2.4, with a variety of causes. So far I've determined the electric air pump runs, because I can hear it. The condensation and ice that are known ..., 2 Jan 2014 ... Do you occasionally get code P0420 - catalytic converter low efficiency? This $3 electrical circuit may fix the problem permanently by ..., A flat or damaged tire on a Chevy Tahoe should be removed and changed immediately. The Tahoe is a top-heavy SUV and driving on a flat or soft tire can result in injury to the drive..., P0420 code for 2012 Chevy equinox 2.4 flex fuel. Mechanic's Assistant: Have you noticed an increase in fuel consumption? And how does the Equinox start—same as usual? No noticeable change in fuel consumption it does sometimes cut off after starting for the first time in the morning it also gets a rough bumping when …, This page is meant to help you troubleshoot the Chevy Suburban 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. …, Chevrolet P0420 Trouble Code. The Chevy Cobalt, Malibu, Equinox, and Silverado pickups are prone to P0420. On these vehicles, trouble accelerating and reduced MPG accompany the code. Upstream oxygen sensors need frequent replacement. Eventually, the cat also requires replacement after 5-7 years of use., Summary. DTC P2097 stands for “Post Catalyst Fuel Trim System Too Rich Bank 1”. This code is triggered when the downstream bank 1 oxygen sensor registers a rich condition. The most common symptoms of a P2097 include a lit check engine light, poor engine performance, and a reduced fuel economy. Contents., The Chevrolet 5.7-liter (350-cubic-inch) engine employs an overhead valve design that requires occasional maintenance. Adjusting the clearance between the valve stem and rocker arm..., Jul 22, 2018 · P0420 is an OBDII trouble code. The code technically stands for: Catalyst System Efficiency Below Threshold. Your Chevrolet has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. , Mar 21, 2024 · 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 attributed to a malfunctioning catalyst or potentially be a false alarm triggered by a defective O2 sensor. The engine control module (ECM) uses two O2 sensors, one in front, and one behind ... , 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., OBD II fault code P0420 is a generic code that is defined as “Catalyst System Efficiency Below Threshold (Bank 1)”, and is set when the PCM (Powertrain Control Module) detects a condition that indicates that the catalytic converter on Bank 1 is operating below the minimum allowable efficiency threshold. Note that on engines with two banks ..., Código P0420: significado, síntomas, causas (soluciones fáciles) Entre las causas, la más frecuente del código P0420 es por un convertidor catalítico averiado. Igualmente puede deberse por un sensor O2 en mal estado, una fuga de escape, fuga de admisión o ubicación errónea del convertidor catalítico. Otra causa, sería un convertidor ..., Jun 5, 2017 · R. 2013 Equinox P0700 and P0601 Code Car failed on interstate. Reba. Oct 12, 2023. 2010-2017 Equinox Maintenance. , You may ever experience troubleshooting, such as P0420 Chevy equinox. It happens after your car is connected to the scanner. The code appears to indicate there is an issue related to catalyst system efficiency. Based on this result, it seems your issue comes from the catalytic converter. It is capable to scrub pollution, so the emission is free ..., 2016 Equinox setting a P0172. High Pressure pump leak... Great example of a time that multiple SI resources would have helped determine vehicle problem faster. 2016 Equinox setting a P0172. High ..., Sep 7, 2017 · 2012 Chevrolet Equinox 135,000miles. 2.4L. P0420 Keeps coming back. I have an up to date snap scanner and can read any information needed. I need to troubleshoot to find the problem. I am looking for someone that has done this before. Answered in 6 minutes by: , Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both ..., The price of the 2020 Chevrolet Equinox starts at $24,995 and goes up to $32,595 depending on the trim and options. The midrange Equinox LT is the best value in its class—so long as you're ..., P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Equinox. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause P0138., Replies. 6. Views. 3K. Dec 18, 2023. Uluz2a6. U. ok i have the 2013 equinox nd i get the p0420 code all day long. i know why because the engine burned so much oil …, P0420 - 2010 Chevy Equinox LTZ 6CY - O2 BANK LOCATIONS. I am getting a P0420 - Catalyst System Efficiency Below Threshold (Bank 1). The 2010 6CY has two converters that come off the engine. One on the back of the engine towards the rear of the car and one on the front of the engine that comes off the front of the car., B. BigCountry24 Discussion starter. 2 posts · Joined 2024. #1 · Jan 12, 2024. Equinox started throwing a P0299 underboost fault, and goes into limp mode and wont get out of its own way. Clear the fault and boost comes back and runs fine temporarily, then resets the same P0299. Drove it with my scanner on it and for some reason its not …, Apr 19, 2018 · Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both ... , Jul 30, 2020 · Have you had trouble finding youre down stream oxygen sensor? We had the common check engine code p0420 come up we started with replacing the upstream senso... , Aug 10, 2018 · When there is a large leak in the Chevy Equinox’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a large leak in the evaporative emission control system. (EVAP). There are different leak size codes. For example, P0456 means your Equinox has a small EVAP leak. While the trouble code may state that there is a “large leak ... , =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P2097 Saving Repair Parts..., One of the most common and most reported problems with the Chevy Equinox 2006 model is that the heater blows out cold air. Other problems include the key not turning in the ignitio..., Apr 19, 2018 · Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both ... , Q: Codes P0420 and P0171 appearing. I took my car to the dealership to have it checked out. Two codes were found: PO420 and PO171. They told me that the P0420 is a problem with the actuator (part number 17230-21010), and the 2nd one has to do with the Mass Air Flow (22204-21010). Both of these makes my check engine light continually appear and ..., P0121 Definition. P0121 will trigger in your Chevy Equinox if it’s TPS “A” circuit has an output voltage that goes above or below the sensor’s normal operating range. It’s a general powertrain code, which means that it has the same meaning regardless of who manufactured the vehicles (1996+)., When the Chevy Equinox displays a p0420 fault code, this indicates a bad oxygen sensor. Replacing the responsible oxygen sensor will usually make this code go …, P0420 is a code that indicates that the catalytic converter in the exhaust is not operating efficiently. This can happen over time as the catalyst material inside of the converter wears out. You would need to replace the converter in order to clear this code. Id highly recommend going with an original converter from GM since aftermarket ones ...