P0420 Equinox 2011The P0420 code in a Chevy Equinox will often be thrown if one of your vehicle’s oxygen sensors is not functioning correctly. P0300 and p0420 on a 2011 Chevy equinox 2. Chevrolet P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. 2011 Chevy Equinox engine problem/stalling/rough idle ">2011 Chevy Equinox engine problem/stalling/rough idle. When the Chevy Equinox displays a p0420 fault code, this indicates a bad oxygen sensor. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. P0300 and p0420 on a 2011 Chevy equinox 2. If your Chevy Equinox is displaying the P0172 code, it means that the engine is running too lean. P0420 Chevy Equinox Issue and Solutions to Fix Properly. code P0420 fixed w/Oxygen Sensor O2 Sensor Extender by adrian22 » 11 Feb 2019, 21:12 s60 2006 120k miles has engine check light and code P0420 “Catalyst System Efficiency Below Threshold (Bank 1). If your Chevy Equinox is displaying the P0172 code, it means that the engine is running too lean. 4 Grade A at the best online prices at eBay! Free shipping for many products!. I have a 2011 Chevy equinox, these codes keep coming up p0138, P0341, p0420, p0340. It happens after your car is connected to the scanner. Diagnosing the error code P0420 on a Chevy Equinox (2011). The P0420 code signals a low catalyst system efficiency. 00 reason the cat went out was excessive oil consumption which clogged the ceramic inside of the cat, evidently you have to remove the transfer case to replace the cat also. We determined the car’s best years by comparing their FIXD Reliability Score and Owner Reliability Score. Slip Gauges, Slip Gauge, Manufacturer, Aurangabad. P0420 code fix PERMANENT, EASY, CHEAP Daniel Bargas 3. If your Equinox’s engine is misfiring enough to damage the catalytic converter, the check engine light may flash on and off as a warning to stop running the engine until you can fix it. The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. Year and Model: See Signature below. 4 AWD was created by GerryM Randomly intermittent P0089 and P228D. Bank 1 refers to the side of the engine that houses the number one cylinder. These sensors draw air from around the wiring and connectors for comparison to exhaust O2 levels, and if it is restricted or blocked, you will set P0420. If your Chevy Equinox has the P0420 code, it means that the catalytic converter is not functioning properly. WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC. Basically, it Engine Control Module (ECU) monitors the chemical. For most people, the first sign that anything is wrong is the service engine soon light coming on. But don’t worry if it seems too overwhelming!. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can. Equinox Tungsten Carbide Slip Gauges are manufactured from specially selected grade of carbide with hardness 1500 Vickers. It can be caused by a faulty catalyst, or it can be a false alarm caused by a faulty. Used Front Right Exterior Door Handle fits: 2011 Chevrolet Equinox front body co: Condition: Used. Code P0420 can either be caused by a bad catalytic converter with low efficiency or a false alarm triggered by a sensor such as the downstream or upstream oxygen sensor. Engine Code CHEVROLET P0420: Catalyst System Efficiency Below Threshold (Bank 1). P0420 Chevy Equinox OBDII Code Diagnosis and …. About Equinox Gauges Registered in 2011 , Equinox Gauges has made a name for itself in the list of top suppliers of tungsten carbide wear parts in India. [FIXED] Intermittent P0089, P228D 2011 Chevy Equinox 2. 352 subscribers Diagnosing the error code P0420 on a Chevy Equinox (2011) Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output. 2010-2017 Equinox Maintenance. After the third time it stalls the check engine light comes on and either the code P0420 (catalytic converter) pops or code N/a pops. If i clear it out, It comes back before starting the car - Answered by a verified Chevy Mechanic We. There are a few things that can cause this, but the most common is a problem with the oxygen sensor. 2011 Equinox, AWD, 107,000 miles has P0420 MIL code needs new cat converter. Code P0420 stands for: P0420 Catalyst System Efficiency Below Threshold. Air leakage in the exhaust system. Equinox Gauges in Aurangabad, Maharashtra, India. Details about Used Front Right Exterior Door Handle fits: 2011 Chevrolet Equinox front body co See original listing. If the code changes to P0420, that would indicate that one of the O2 sensors is bad on the bank 2 side. Gumout fuel inj. Jul 13, 2017. Any ideas to what it could be causing it. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Regional Sales Manager – Speciality Cable Business , Enterprise & Utility. The code P0420 for your 2. Just about anything that messes with the air/fuel ratio can trip a P0420. P0300 and p0420 on a 2011 Chevy equinox 2. Chevrolet P0420 – Meaning, Causes, Symptoms, & Fixes">Chevrolet P0420 – Meaning, Causes, Symptoms, & Fixes. There are rarely drivability issues associated with P0420. Exhaust manifold with leaks in them. I have a 2011 Chevy Equinox that is also have the same engine problems (diesel-like start, rough idle, stalling, etc). This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car’s. Watch the O2 sensor readings while you do this. Engine/Drivetrain The Dreaded P0420 4493 Views 17 Replies 4 Participants Last post by rbarrios , May 12, 2022 S sallaho Discussion Starter · Mar 23, 2021 Ever heard of this code? well I got hit with it a while back and it has been coming and going for sometime. P0420 is probably the most common code seen. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? Engine light, and gives the codes p0420. The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. They are called the intake & exhaust camshaft position (CMP) actuator solenoids. Inspect for the conditions listed below, which may cause a catalyst to degrade: Engine misfire; High engine oil or high coolant consumption; Retarded spark timing; Weak or poor spark; Lean fuel mixture; Rich fuel mixture. 8K subscribers Subscribe 49K views 1 year ago UNITED STATES. to/2QmNBri Check out our Amazon Store for the to. The code P0420 for your 2. GM P0420 – Meaning, Causes, Symptoms, & Fixes. P0420 code will clear itself if after several drive cycles the computer sees O2 S2 creating a voltage consistently above 0. Engine/Drivetrain The Dreaded P0420 4493 Views 17 Replies 4 Participants Last post by rbarrios , May 12, 2022 S sallaho Discussion Starter · Mar 23, 2021 Ever heard of this code? well I got hit with it a while back and it has been coming and going for sometime. They say I need to replace the catalytic converter (s). 2011 Chevy equinox, these codes keep coming up">I have a 2011 Chevy equinox, these codes keep coming up. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. If they are, replace them with new ones that have been designed to handle the power of your vehicle’s engine as well as possible. The O2 sensors in the emission system measure the catalytic converter efficiency. With most of the course on trails and a challenging climb up and over Ester Dome—and up and over it again!—it is a challenging marathon that will test your running abilities. Seems to only do it at Idle and in gear about a 1/2 hr into driving. P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1). If your Chevy Equinox has the P0420 code, it means that the catalytic converter is not functioning properly. service/clean, replaced both O2 sensors, replaced the gas cap, used a very high quality fuel injector in the gas, fuel injector flush, replaced all 6 fuel injectors, R&R intake and decarbonize engine, STILL ON with the same code P2097 post catalyst fuel trim system high limit. Cost of diagnosing the P0420 code. 5v and only going below that during a throttle. Sterlite Technologies Limited Unit No: 1101; 1109, The Dome. plugs, coils, crank sensor and both o2s have been replaced and well as exhaust manifold and ECU. The catalyst within the converter promotes a chemical reaction, which oxidizes the hydrocarbons and the CO that are present in the exhaust gas. After the engine and the catalyst are warmed up, and while the. The code appears to indicate there is an issue related to catalyst system efficiency. If you have this code, take your car to a mechanic and. I have a 2011 Chevy equinox, these codes keep coming up p0138, P0341, p0420, p0340. P0300 Trouble Code Causes + Diagnosis. After the third time it stalls the check engine light comes on and either the code P0420 (catalytic converter) pops or code N/a pops. If you have this code, take your car to a mechanic and have them check the oxygen sensor. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car. If the code changes to P0420, that would indicate that one of the O2 sensors is bad on the bank 2 side. The data from 1990 is available on. There are a few things that can cause this, but the most common is a problem with the oxygen sensor. A extender does not fix the problem, it hides the problem by fudging the data. The code P0420 for your 2. 7M views 6 years ago How to fix you emissions p0420 code for cheap, easy, fast. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE - Extended driving with this code can cause internal engine damage. Excess vibration, especially at lower RPM. The engine control module (ECM) uses two O2 sensors, one in front, and one behind the catalytic converter to measure its efficiency. You may ever experience troubleshooting, such as P0420 Chevy equinox. We had the common check engine code p0420 come up we started with replacing the upstream sensor (right behind the spark plugs) after doing this the car ran worse and a new air code came on saying. Q: code P0420 on my 2012 Chevy Equinox 2. We live 2 hours away from where we bought the car so we couldn't take it in until the following weekend. P0420 Chevy Equinox OBDII Code Diagnosis and Meaning. We bought a 2011 Equinox in May with 101K miles. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Compatibility: See compatible vehicles. P0420 code will clear itself if after several drive cycles the computer sees O2 S2 creating a voltage consistently above 0. It can also be caused by internal oil leaks that cause the catalyst to clog up, which will result in reduced efficiency. Find many great new & used options and get the best deals for Used Radiator fits: 2011 Chevrolet Equinox 2. P0420 code fix PERMANENT, EASY, CHEAP Daniel Bargas 3. I have a 2011 Chevy equinox, these codes keep coming up p0138, P0341, p0420, p0340. It indicates that the Catalytic Converter is not functioning efficiently, so the vehicle is increasing the output. 4 L engine is for the after the catalyst O2 sensor. What are the Possible Causes of the P0420 Code?. 5v and only going below that during a throttle closed "coasting". my 2011 Chevy Equinox check engine light on, reads …. We bought a 2011 Equinox in May with 101K miles. The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. Where is the Down stream o2 sensor? 2011 chevy equinox. If your Chevy Equinox has the P0420 code, it means that the catalytic converter is not functioning properly. A 2011 2. Based on this result, it seems your issue comes from the catalytic converter. 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. Came back with a P0420 code, which says the Bank 1 catalyst system efficiency was below threshold for a predetermined period of time. 0:00 / 2:58 How to Fix CHEVROLET P0420 Engine Code in 3 Minutes [3 Methods / Only $19. The opposite side of the engine is Bank 2. WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC, BUICK, CADILLAC Great Car Scanner: https://amzn. 4 AWD">Intermittent P0089, P228D 2011 Chevy Equinox 2. The P0420 code indicates that the ECM has detected underperformance of the catalytic converter’s efficiency on Bank 1. These sensors draw air from around the wiring and connectors for comparison to exhaust O2 levels, and if it is restricted or blocked, you will set P0420. Replaced cats, replaced O2 sensors, still get 420 and 430. The code appears to indicate there is an issue related to catalyst system. P0420 is probably the most common code seen. P0420 Code: Meaning, Causes & How To Fix It. 2011 Chevy Equinox engine problem/stalling/rough idle. P0420 on my 2012 Chevy Equinox 2. You may ever experience troubleshooting, such as P0420 Chevy equinox. I have a 2011 Chevy Equinox that is also have the same engine problems (diesel-like start, rough idle, stalling, etc). If the catalytic converter has failed or DTC P0420 (Catalyst System Low Efficiency) or P0430 (Catalyst System Low Efficiency Bank 2) is set on some 2015 and prior GM cars and gasoline-powered mid-size trucks, light-duty trucks and heavy-duty trucks, inspect for a poor crimp at circuit terminal on the engine bank with the condition. Conditions for Clearing the DTC. The code can be from a defective sensor or catalytic convertor. Find the two small cylinders just to the left of the #1 spark plug. I am not sure what the standard provedure for this is but the shop said they cleared the code (erased the check engine light) and did a test run to see if the light would come back on. The P0420 code in a Chevy Equinox will often be thrown if one of your vehicle’s oxygen sensors is not functioning correctly. In some more serious cases, the muffler of the car might need to be fixed or replaced to get rid of the code. If you’re getting the Chevy P0172 code, the first thing you should do is check the MAF sensor. Find many great new & used options and get the best deals for Str Assemb Front Right Ultra ReadyMount for CHEVROLET EQUINOX 2011-2012 Gabriel at the best online prices at eBay! Free shipping for many products!. Bank 1 refers to the side of the. 4L O2 sensors">Q: code P0420 on my 2012 Chevy Equinox 2. car runs well with good 28mile/gal on highway Question : is this an oxygen sensor issue? or Catalyst?. My question is, would it be better to replace the o2 sensors first and see what happens?. Used Front Right Exterior Door Handle fits: 2011 Chevrolet Equinox. Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by the vehicle. One is in manifold before the catalyst and the other is after the catalyst. Best & Worst Years of Audi A4 – Graphs & Owner Surveys. Year and Model: See Signature below. In this video we will explain the top reasons why most Chevrolet, Chevy, GMC, Buick, and Cadillac car gets code P0420 and. P0420 – Catalytic converter system, bank 1. If the catalytic converter has failed or DTC P0420 (Catalyst System Low Efficiency) or P0430 (Catalyst System Low Efficiency Bank 2) is set on some 2015 and prior GM cars and gasoline-powered mid-size trucks, light-duty trucks and heavy-duty trucks, inspect for a poor crimp at circuit terminal on the engine bank with the condition. P0420: What Does It Mean & What to Do When It Appears?">EOBD P0420: What Does It Mean & What to Do When It Appears?. Need help on a 2011 Chevy equinox LT, has a code of: P0420. It can be caused by a faulty catalyst, or it can be a false alarm caused by a faulty O2 sensor. Our certified mobile mechanics can come to your home or office to perform. How to clear p0420 code broken, frayed, or shorted wires The first step to fixing this problem is to check all wiring connections on the vehicle and make sure they’re not damaged or frayed. P0420 P0430 Catalyst Efficiency Below Threshold - Testing & Verification South Main Auto Repair LLC 195K views 3 years ago How to Diagnose a bad Catalytic Converter on Toyota and Lexus The Car. The P0420 Code indicates that your car's computer has detected underperformance from the Bank 1 catalytic converter. Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by the vehicle. Chevrolet Repair Need help on a 2011 Chevy equinox LT, has a code of: P0420. Chevrolet P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. 2011-2013 2014-2016 2017-2019 2020-2021 The Best Years of the Audi A4 The Audi A4 is a very popular luxury car that stacks up with BMW and Mercedes models. Chevrolet Equinox P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Contact – Sushil Deshpande , RCDD. The Catalyst is really a small furnace that reburns the exhaust and adds more oxygen where necessary, to eliminate. What Does the P0420 Code Mean? The Engine Control Unit (ECU) in your car is responsible for monitoring the emission system sensors. Another check engine light gave P0303. Got an engine light on the way home from the dealership. P0420 is probably the most common code seen. I have a 2011 Equinox that is periodically stalling and hesitating. It refers to "Catalytic Converter Efficiency". I have a 2011 Equinox that is periodically stalling and hesitating. I recommend that you replace them both. How to Fix CHEVROLET P0420 Engine Code in 3 Minutes. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from. Need help on a 2011 Chevy equinox LT, has a code of: P0420. Chevrolet Repair Need help on a 2011 Chevy equinox LT, has a code of: P0420. Under load (driving down the highway, climbing a hill, acceleration) the voltage of O2 S2 should be consistently high and not drop below 0. Chevy Mechanic: Ask Your Own Chevy Question Experience: 35 years experience with ASE Certs Ron, ASE Certified Technician 46,141 Satisfied Customers 35 years experience with ASE Certs Ron is online now Related Chevy Questions … High School or GED …. Common P0420 Diagnosis Mistakes. bank 1 sensor 2) have the same amplitude. 2014 Chevy Equinox-Catalytic Converter changed-Codes P0131 & P0171. 352 subscribers Diagnosing the error code P0420 on a Chevy Equinox (2011) Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output. I have 2012 Chevy Equinox 2. P0420 Oxygen Sensor Fix speedkar99 394K subscribers Subscribe 3. Rigid attention is paid throughout the manufacturing. While this is a possibility, the most common problem is a faulty catalytic converter. We called the dealership who said to bring them the car and they will look into it. Replacing the responsible oxygen sensor will usually make this code go away. Replaced cats, replaced O2 sensors, still get 420 and 430">Replaced cats, replaced O2 sensors, still get 420 and 430. Chevy equinox 2011: code p0420. Your vehicle has only two O2 sensors. The P0420 code indicates that the ECM has detected underperformance of the catalytic converter’s efficiency on Bank 1. Common P0420 Diagnosis Mistakes. vehicle is driven within the set vehicle and engine speed range, the waveforms of the oxygen sensors (bank 1 sensor 1 and. What Does the P0420 Code Mean? The Engine Control Unit (ECU) in your car is responsible for monitoring the emission system sensors. P0172 Chevy Equinox Error Code. 0:00 / 2:58 How to Fix CHEVROLET P0420 Engine Code in 3 Minutes [3 Methods / Only $19. Oftentimes, this code is thought to be a faulty O2 sensor or A/F Sensor. Your Equinox will jerk while accelerating. I had issues with jerking when idle, rpm’s are high when accelerating after getting to speed they drop, sometimes when stopped at light and then try and accelerate the car shuts off. There are a few things that can cause this, but the most common is a problem with the oxygen sensor. The P0420 code in a Chevy Equinox will often be thrown if one of your vehicle's oxygen sensors is not functioning correctly. P2097 check engine light on GMC Acadia. The P0420 code signals a low catalyst system efficiency. The system should have further tests done to make sure the correct. P228D Code: Fuel Pressure Regulator 1 Exceeded Control Limits. 0:00 / 2:58 How to Fix CHEVROLET P0420 Engine Code in 3 Minutes [3 Methods / Only $19. How to clear p0420 code broken, frayed, or shorted wires The first step to fixing this problem is to check all wiring connections on the vehicle and make sure they’re not damaged or frayed. 4L consuming oil with a P0420 at 135,000 miles I’d bet was a Catalytic Converter damaged by the oil, but you say it’s only got 15,000 miles on it, so did you replace the Converter, and with what brand? If that’s a GM Converter I’d doubt it’d be gone that quickly. I have 2012 Chevy Equinox 2. Came back with a P0420 code, which says the Bank 1 catalyst system efficiency was below threshold for a predetermined period of time. The P0420 code in a Chevy Equinox will often be thrown if one of your vehicle’s oxygen sensors is not functioning correctly. Basically, it Engine Control Module (ECU) monitors the chemical constituents of the exhaust, both before and after the catalytic converter. GM P0420 – Meaning, Causes, Symptoms, & Fixes">GM P0420 – Meaning, Causes, Symptoms, & Fixes. It has been at the dealership for 5 days, and they have yet to "duplicate". When the Chevy Equinox displays a p0420 fault code, this indicates a bad oxygen sensor. The system should have further tests done to make sure the correct part is replaced before. 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. Watch this video and learn how to. [FIXED] Intermittent P0089, P228D 2011 Chevy Equinox 2. I had the car looked at buy pep boys. GM P0420 Causes The most common reason for check engine code P0420 is catalytic converter failure, but there are other potential causes for this code. Using a propane torch, add propane fuel around the intake manifold, exercising proper care to avoid ignition. 12K views 2 years ago 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 sensor (right. The P0420 code signals a low catalyst system efficiency. Welcome to the Equinox Marathon and Relay site! The Equinox Marathon is the premier running event in Interior Alaska. eMarksheet is a web portal for online verification of "statement of marks" and "passing certificate" for SSC (10th exam) /HSC (12th exam). I have a 2011 Chevy equinox, these codes keep coming up. Basically, it Engine Control Module (ECU) monitors the chemical constituents of the exhaust, both before and after the catalytic converter. 7K 637K views 6 years ago Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check. If put into neutral, park or raise the rpm just off of idle the symptoms and high pressure returns to normal. Do not overlook other codes that are paired along with P0420. 8K subscribers Subscribe 49K views 1 year ago UNITED STATES ============================= Claim. Diagnosing the error code P0420 on a Chevy Equinox (2011. It is designed to optimize performance and keep the exhaust system emissions within acceptable limits. Equinox P0171 or Terrain P0171 trouble code — Ricks Free Auto …. Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and possible engine damage. P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. What Does the P228D Code Mean?. 7M views 6 years ago How to fix you emissions p0420 code for cheap, easy, fast. Note that on engines with two banks. P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. P0420 is a diagnostic trouble code (DTC) for "Catalyst System Efficiency Below Threshold (Bank 1)". ">Need help on a 2011 Chevy equinox LT, has a code of: P0420. When your vehicle’s electronic fuel pressure regulator develops a problem, the P228D code or other related trouble codes could trigger. If it’s dirty, clean it and see if that clears up the problem. Equinox/Terrain Intake Manifold Connect your scan tool or scope to watch Oxygen sensor reading while you perform a propane enrichment test. Chevrolet Repair Need help on a 2011 Chevy equinox LT, has a code of: P0420. There are rarely drivability issues. If the O2 readings spike, you’ve found. If your Chevy Equinox has the P0420 code, it means that the catalytic converter is not functioning properly. Equinox P0430: Catalyst System Efficiency → Below ">Chevy Equinox P0430: Catalyst System Efficiency → Below. But if you choose, you can just replace the intake actuator for a 10 or 11 code or the exhaust actuator for a 13 or 14 code. P0420 P0430 Catalyst Efficiency Below Threshold - Testing & Verification South Main Auto Repair LLC 195K views 3 years ago How to Diagnose a bad Catalytic Converter on. On some vehicles, an electronic fuel pressure regulator helps maintain the appropriate fuel pressure needed by the engine’s fuel injectors. Chevrolet P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. code P0420 fixed w/Oxygen Sensor O2 Sensor Extender. my 2011 Chevy Equinox check engine light on, reads code P0420. DTC P0420 is a Type A DTC. The P0420 code indicates that the ECM has detected underperformance of the catalytic converter’s efficiency on Bank 1. 4L consuming oil with a P0420 at 135,000 miles I’d bet was a Catalytic Converter damaged by the oil, but you say it’s only got 15,000 miles on it, so did you replace the Converter, and with what brand? If that’s a GM Converter I’d doubt it’d be gone that quickly. There are rarely drivability issues associated with P0420. code P0420 fixed w/Oxygen Sensor O2 Sensor Extender by adrian22 » 11 Feb 2019, 21:12 s60 2006 120k miles has engine check light and code P0420 “Catalyst System Efficiency Below Threshold (Bank 1). (2 trip detection logic) Trouble Area: Gas leakage on exhaust system. I recently had my 2011 Equinox in to be looked at for a check engine light which later revealed that the code P0420 is Catalytic Converter. 16 years of experience. Codes like P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, and P0308 are misfire. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. P0420 P0430 Catalyst Efficiency Below Threshold - Testing & Verification South Main Auto Repair LLC 195K views 3 years ago How to Diagnose a bad Catalytic Converter on Toyota and Lexus The Car. Conclusion If there are no codes other than P0430 present, and the O2 sensors are recording data properly, it’s likely your Chevy Equinox’s catalytic converter has failed, which is what this code is reporting. When the Chevy Equinox displays a p0420 fault code, this indicates a bad oxygen sensor. I have recently replaced both O2 sensors and the catalytic converter. 2011 Equinox, AWD, 107,000 miles has P0420 MIL code needs new cat converter. Code P0420 Chevrolet Description A 3-way catalyst controls emissions of hydrocarbons, Carbon Monoxide (CO), and Nitrogen Oxide (NOx). Chevrolet P0420 – Meaning, Causes, Symptoms, & Fixes. Also check to see if it had the original oem connector, or one that had to be cut/spliced to your harness.