P0420 code chevy trax

Here are the most common symptoms of an exhaust leak: Loud Rumbling Sound - As the exhaust leak escapes through holes in the exhaust, it will let out a deep rumble sound. This is the sound of unmuffled exhaust, and is the most obvious symptom of an exhaust leak. Smell - Leaking exhaust smells terrible. If your Trax has leaking exhaust, the ...

Diagnostic trouble code (DTC) P0599 stands for "Thermostat Heater Control Circuit High.". This code is triggered when the powertrain control module (PCM) detects an incorrect signal from the thermostat. The P0599 code is caused by wiring or connector problems, thermostat failure, coolant leaks, or PCM failure.This page is meant to help you troubleshoot the Chevy Blazer 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. TableFIX CODE P0420 ON CHEVROLET CRUZE, CHEVY SONIC Catalyst System Efficiency Below ThresholdIf you have engine light on and code such as P0420 we will explain ...After taking it to a mechanic, I was told the Accelerator Pedal Sensor is bad, so it was as suggested that I go to Chevy to update the software. The car has 82,000 miles, sadly. I haven’t had it a full 2 Years. The Codes that come up are as follows, 1st. P2138 - APP sensor-Accelerator Pedal position Sensor 2nd. & P0420 - Catalytic Converter=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code CHEVROLET P0116 Saving Re...set the code due to large leak or purge blockage. A large leak can occur from an unseated tube connection, a damaged tube, a stuck opened canister vent valve or a stuck closed purge valve. For DTC P0442 (small leak detected), the vehicle will set this code due to small leak. The leak can occur from a stuck open purge valve or stuck open ...

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.If the code is happening on a later model Subaru (2015 - present) the chances are it's a bad catalytic converter, otherwise a newer model would throw a specific code for the oxygen sensor if it was the culprit. P0420 Code in Toyota. If you have code P0420 in Toyota models, it's usually due to a faulty catalytic converter. 2018 Chevy trax lt. With 51,000 miles on keeps throwing code P0420. The catalytic converter isn't functioning efficiently. I make the appointment with the dealership because it’s under warranty and it just goes away. It’s now happened 3 times in a month. 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...Sep 8, 2022 · 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. Chevrolet — Cruze (Gen II - VIN B) 2016 2019 1.4L (RPO LE2) Equinox 2018 2020 1.5L (RPO LYX) Malibu 2016 2020 1.5L (RPO LFV) Trax 2019 2019 1.4L (RPO LE2) Volt 2016 2019 1.5L (RPO L3A) GMC Terrain 2018 2020 1.5L (RPO LYX) Involved Region or Country North America, China, Thailand, Middle East, Israel, Europe, Brazil, Chile, Colombia, Peru ...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.The most common symptom reported for the P0420 error code is an illuminated check engine light. You may also hear a loud exhaust noise with the P0420 …

8 Mar 2023 ... Chevy Trax aka Holden Trax 2013 to 2021 common problems, issues, defects, recalls ... P0420 Code on Chevy Trax 1.4L Turbo. Paul Routhier•45K ...Code P0455 may appear on some Chevy vehicles. On a 2010 Chevrolet Silverado 1500 LS 5.3L V8, for example, this DTC is set when “the EVAP system is not able to achieve or maintain a calibrated level of vacuum within a set amount of time.” The code appears in a 2010 Chevrolet Silverado 1500 5.3L V8 because of the following conditions:About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Code p0420 (catalytic converter) on a Chevy trax. Mechanic took cat off and said it looked ok on the inside. I also put a new o2 sensor and code still stayed. ... If the plugs were misfiring enough to cause a P0420, they would also set misfire codes and you'd most likely see an o2 sensor rich code Reply replyHonda pilot sensor o2 2005 p0420 code replacement Honda pilot odyssey mdx crv p145c p0497 p0455 p0456 evap code. 22 Jun 2023. Honda evap civic system 2004 test leak Acura tl 2007 check light engine Solved: check engine on 2012 honda pilot. code is p0430. 2007 Acura TL Check Engine Light P145C, P0497 - YouTubeP0420 - Researched to death **Solved**. Earlier this year, 20 miles before I clicked off 120k on my truck I popped a code for the DEF heater. Dealer replaced, all was good, until last week. I drive sparingly, usually to visit family or to and from the airport. On the way back from one of those trips, I popped a code P0420 for Catalyst efficiency.

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I keep getting a check engine light code for P0420 Catalyst System Efficiency Below Threshold (Bank 1) on a 2016 Chevy Trax. I change both O2 sensors out and even the Catalytic convert. I went with Certified GM parts to replace the bad parts with.If your Chevy Trax won't accelerate, that is a serious cause for concern. If your check engine light is on, get a code scanner and see what trouble codes are stored in the PCM (powertrain control module). ... A clogged catalytic converter will likely appear with a code such as P0420 or P0430. Your Trax’s exhaust must pass through the ...Chevrolet Equinox All 2018 Equipped with 2.0L or 1.5L Engine (RPOs LTG, LYX) GMC Terrain Holden Equinox Involved Region or Country North America and N.A. Export Regions ... vehicles may not show an E48 RPO code, so use the other RPO identifiers to select the correct cover. Causal Part Description Part Number RPO X Charge Air Cooler …Chevy Trax P0011: What it Means + How to Fix. October 13, 2022 by Jason. P0011 is a common (and serious) OBD II diagnostic trouble code that can occur in the Chevy Trax. It indicates an issue with your vehicle's Variable Valve Timing (VVT) system. The first thing you should do when you have this code is check your Trax's oil.

P0234 is a standard OBD2 trouble code that can occur in the Trax. In layman's terms, it indicates a potential problem with an engine's forced induction system, and you should only see it if your vehicle is turbocharged. Too much boost can trigger the sensor to turn on the check engine light. This warning code requires immediate attention to ...11 Sept 2020 ... 2017 - 2020 Chevy Trax Cabin Air filter Replacement - How To Change Or Replace AC Filter Location ... P0420 Code on Chevy Trax 1.4L Turbo. Paul ...The service advisor will use a code scanner to diagnose the problem, giving you a code number to investigate. Trouble codes for the 2018 Chevy Trax include P0300, P0171, P0420, and P0500. You can also learn about these codes online. Another common problem with the 2018 Chevrolet Trax is a weld failure on the front lower-control arms.3 posts · Joined 2021. #17 · Jun 4, 2021. Hello, I'm having issues with my P0299 code on my 2015 Buick Encore (I know it's not Chevy Trax but the people posting seem to have knowledge on what's going on). I first got the code and pulled the turbo and there was a crack on the inside of the turbo, obviously bad.If your Chevy Trax won't accelerate, that is a serious cause for concern. If your check engine light is on, get a code scanner and see what trouble codes are stored in the PCM (powertrain control module). ... A clogged catalytic converter will likely appear with a code such as P0420 or P0430. Your Trax’s exhaust must pass through the ...Labor: 1.0. To diagnose the P0480 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.20 Jun 2022 ... different sensors, make sure you get the right one. engine code P2227, engine code ... Code P0236 Chevy Trax, Cruze, Sonic or even Buick Encore ...The ECM also has a dedicated replicated Camshaft Position Sensor signal output circuit that may be used as an input signal to other modules for monitoring engine RPM. The Diagnostic Trouble Code (DTC) will be set when the ECM does not receive less than 4 pulses from the Camshaft Position Sensor during 2 engine revolutions. P0341 Chevrolet Code ...2015 Chevy Malibu LS P0420 code. Hey, so this code popped up on my car. "P0420 Catalyst system Efficiency below threshold. bank 1" now a few months prior I had a code pop up that said fuel rich to lean and I was told not to worry about it.. (I am very upset..Chevy Trax P0496 Meaning. P0496 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing. The code technically stands for: The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process.34 posts · Joined 2018. #3 · Nov 19, 2018 (Edited) P0420 is usually a cat failure. When the o2 sensors aren't working properly it will usually set an o2 not switching code or a stuck rich/stuck lean code. If its wiring it would throw a circuit high /circuit low code. The p0420 means that the o2 sensors are indicating there is not enough ...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 Sep 08, 2022. Possible Causes;

2004 - 2015 Chevrolet Avalanche, Express, Silverado, Silverado Hybrid, Suburban, Tahoe, Tahoe Hybrid 2004 - 2015 GMC Savana, Sierra, Sierra Hybrid, Yukon, Yukon Hybrid ... On a new vehicle, catalytic converter efficiency DTCs P0420 and P0430 are disabled for the first hour of engine run time to allow break-in of the catalytic

Check Engine code P0420 Catalyst efficiency below threshold bank 1. 5. How do I fix P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2. 2. 2001 Elantra keeps throwing the same check engine light code. 7. 2003 Toyota Corolla, 185k: erratic OBD codes, fuel smell, other symptoms. 1.A P0420 code is set when the upstream sensor and the downstream oxygen sensor sense the catalytic converter is not doing its job. Basically, the amount of oxygen going into the converter is not being burned, and it detects it through the downstream sensor. Oxygen is the key here. Modern Engine Management Systems leave a little bit of extra ...To further clarify, from my own experience with p0420, the "catalyst efficiency" can be made to increase and exceed the threshold by which the p0420 code is set by correcting the engine issues. When monitoring my engine using Torque Pro ($5.00) and an OBD2 bluetooth adaptor ($35.00), I can track the pid "catalyst efficiency" in the "test ...Pretty much like the title says, it's the one code I was hoping would clear when I got rid of the rich fuel condition. After resetting the fuel composition (previously had P0172/P0175) this was the only code that came back, anybody found a solution other then cats? I'm still pretending there is hope it's something else (cheaper).Labor: 1.0. To diagnose the P0299 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Chevy Camaro P0420 Code Symptoms. The P0420 code in a Chevy Camaro will often be thrown if one of your car's oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. For most people, the first sign that anything is wrong is the service engine soon light coming on.engine trouble codes. I have a 2015 TRAX LS 1.4L with 115K miles. I am the original owner and know the complete service history of the vehicle. A few weeks ago I drove to the supermarket and when I started the car back up the check engine light immediately came on. I pulled a single code - "U0073 Control Module Communication Bus Off."

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It was showing the three codes and since I had to go to work the next day, there was enough time for a fourth code to show up as well. P0036, P0138, P0140 and P0041. (Listed below are the basic causes with the common thread in italics.)Chevy Cobalt. Problems and Service ... Code P0420 Catalyst System Efficiency below threshold. Bank 1 ... smilie_flagge17 rives 2016 Sunset Orange Trax LT1 1.4L Turbo ...1 2. Blasirl. 15872 posts · Joined 2015. #2 · Sep 2, 2018. Welcome Aboard!:welcome: I am moving this thread to the Gen1 Service Issues. In your case, the …Code p0420 keeps coming up on 2013 Chevrolet duramax. Dpf gets clogged. Dealership just keeps forcing Regen and clearing codes! Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with Chevy.If your Chevy Trax won't accelerate, that is a serious cause for concern. If your check engine light is on, get a code scanner and see what trouble codes are stored in the PCM (powertrain control module). ... A clogged catalytic converter will likely appear with a code such as P0420 or P0430. Your Trax’s exhaust must pass through the ...Solenoid p0017 position cam chevy crankshaft code correlation sensor gmc 2009 chevrolet does bank 2006 blazer canyon denlorstools trail screen P0016 p0017 codes kenny P0017 p0014 chevy fix t. ... chevy cruze code p0420. Check Details. Aveo cruze sonic trax p0011 p0014 p0016 p0017!sera la falla!🤔 ...P0443 Quick Facts. P0443 indicates a problem with the wiring to/from the purge valve or that the purge valve solenoid has a short/open circuit. It typically won't affect the way that your Trax runs. You may smell gas. Most commonly caused by a bad purge valve solenoid. Checking the gas cap may just save a lot of time.#1 · Mar 2, 2022. I keep getting a check engine light code for P0420 Catalyst System Efficiency Below Threshold (Bank 1) on a 2016 Chevy Trax. I change both O2 sensors … ….

24 posts · Joined 2015. #1 · Mar 11, 2021 (Edited) I am getting P0131, P0137, and P0171 codes on my 2015 Chevrolet Cruze. Data is as follows: Fuel Sys: CL. Calc Load: 18.4%.Jun 20, 2022 · 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 ... One of these sensors is the Mass Air Flow sensor (MAF), which monitors the quantity of air entering the engine, and the ECU will illuminate the CEL right away if it detects that the MAF sensor's ... 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 ... I keep getting a check engine light code for P0420 Catalyst System Efficiency Below Threshold (Bank 1) on a 2016 Chevy Trax. I change both O2 sensors out and even the Catalytic convert. I went with Certified GM parts to replace the bad parts with. ... I have the same P0420 code at about 115K miles on my 2015 TRAX. I am the original owner and ...Your Trax will likely throw P0420 or the P0430 code. To diagnose a downstream O2 sensor failure, you can use an OBD2 scanner to check for diagnostic trouble codes related to the sensor. Upstream O2 Sensor Failure. Your Chevy Trax's upstream O2 sensor(s), also known as the pre-catalytic converter sensor, measures the air-to-fuel ratio in your ...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...Blasirl. 15872 posts · Joined 2015. #8 · Dec 17, 2020. 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. Downstream oxygen sensor (HO2S) wiring damaged or connected improperly. P0420 code chevy trax, If there are no other codes but the P0420, it means that the sensors are working the way they should. The sensors have to pass tests in the PCM before it runs the test for the P0420. Put a catalytic convertor on it. The bad head gasket is most likely killed the cat, of course it could have been the mileage also., This page is meant to help you troubleshoot the Chevy Uplander 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. …, Dec 23, 2018 · This page is meant to help you troubleshoot the Chevy Uplander P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. Table , This page is meant to help you troubleshoot the Chevy Blazer P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. Table, P2097 is a generic OBD II code, which means that it has the same meaning for the Chevy Trax as it would any other vehicle. It specifically indicates that your Trax detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter is too rich. (too much fuel for the amount of fuel., This page is meant to help you troubleshoot the Chevy Traverse 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. …, 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 ..., This code is logged when the PCM perceives insufficient coolant flow through the cooling system. Code P00B7 is commonly caused by low coolant levels, faulty thermostats, bad water pumps, or malfunctioning ECT sensors. Common symptoms to watch out for include an illuminated check engine light, overheating engine, and abnormal temperature gauge ..., 189 posts · Joined 2012. #1 · Mar 23, 2018. this has been the year of codes for me. evap and 02 sensores and now cat issues. on 2 cars. i have a 06 2.2 auto cobalt 125k on it. and this code came up p0420 and i ran a ton of tests using the HF scanner. the cat runs at 700 rpm 900 deg at 4k 1200 deg. i did an ir temp and in front of cat like 800 ..., Both upstream sensors fluctuate as they should between 0 and 1 volts, and the two downstream sensors remain consistent as they should, fluctuating between .73- .77 (Bank 1) and .77-.8 volts (Bank 2). I tested that both at idle and at 2200 rpm. A temperature check of the cats shows about 430 degrees on the intake and 550 or so on the exhaust., Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won’t pass an emissions test. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components., Honda pilot sensor o2 2005 p0420 code replacement Honda pilot odyssey mdx crv p145c p0497 p0455 p0456 evap code. 22 Jun 2023. Honda evap civic system 2004 test leak Acura tl 2007 check light engine Solved: check engine on 2012 honda pilot. code is p0430. 2007 Acura TL Check Engine Light P145C, P0497 - YouTube, I have gotten a p0420 code several times on my 2013 LML. For the second time the dealer replaced the DEF tank and heater. Also they replaced a NOx sensor on the first tank replacement, all under warranty. I'm getting the P0420 code again along with a P24AO code. I have read that if the truck doesn't complete a regen cycle it will throw the ..., In the Chevy Tahoe, P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. The code technically stands for: CatalySTSystem Efficiency Below Threshold.Your Tahoe 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., 2 posts · Joined 2021. #1 · Jun 17, 2021. I'm considering replacing the turbo and intake setup in my 2016 trax LT. As I'm sure you all know, the lag is terrible from a dead stop, and the stock intake system is not appropriate for a turbo at all. I have a budget of about $1200 and I'm just curious, other than the obvious intake and ECU upgrade ..., Labor: 1.0. To diagnose the P0299 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., Your orange check engine light is on and the car is sending out the P0420 code. This code means your catalytic converter is not operating properly. This coul..., Code P0300. indicates that your car's computer has detected an engine misfire that's random and/or appearing on multiple cylinders. You'll likely find another OBD2 code—from P0301 to P0308—alongside P0300 as these all point to engine misfires. P0340 Code: Camshaft Position Sensor "A" Circuit Malfunction., The check engine light on your 2019 Chevy Trax will frequently shut itself off if the issue or code that caused it to turn on is fixed. For instance, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will promptly turn itself off. Again, if your catalytic converter is working correctly, and you ... , Engine Code P0171. Ok I have a 2015 Chevy Trax with 82,000 on it. For the last 2 weeks I keep getting this code and cant find the source of it. It can not be the MAF, Dirty Air filter, Upstream and Downstream o2 sensors, or even the spark plugs and coil pack. They have all been replaced. I also had a crack in the exhaust system that was repaired., With its 1950s styling, the 1957 Chevy is a timeless car. This article will show you how to draw this cool classic car in just five simple steps. Advertisement The 1957 Chevy is on..., Dec 5, 2023 · See also Troubleshooting Honda P0740 Code: A Comprehensive Guide for Diagnosis and Repair , 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 …, P0302 code means "Cylinder 2 Misfire Detected". This can happen for various reasons. In your case, a mechanic will need to determine the cause of the activated code. A motorist is sure to have their fair share of car problems during their lifetime. A check engine light conjures up images of costly repairs and car downtime for most drivers., P0234 is a standard OBD2 trouble code that can occur in the Trax. In layman's terms, it indicates a potential problem with an engine's forced induction system, and you should only see it if your vehicle is turbocharged. Too much boost can trigger the sensor to turn on the check engine light. This warning code requires immediate attention to ..., I keep getting a check engine light code for P0420 Catalyst System Efficiency Below Threshold (Bank 1) on a 2016 Chevy Trax. I change both O2 sensors out and even the Catalytic convert. I went with Certified GM parts to replace the bad parts with. ... I have the same P0420 code at about 115K miles on my 2015 TRAX. I am the original owner and ..., The P0420 code indicates a problem with the catalytic converter. This is typically caused by reduced efficiency due to clogging or damage. Still, other issues, such as oxygen sensor failure, exhaust leaks, engine misfires, and fuel system issues, can also contribute to the problem., Service Procedure. • If the Engine Control Module (ECM) has to be programmed, refer to Engine Control Module Reprogramming with SPS in SI. If the ECM has to be …, Now basically 1 year from that, 2/5/20 my engine light appeared, I took it to auto zone to pull the code and it was the same one-p0299. I immediately made an appointment for the dealership and they currently have my vehicle still. ... A forum community dedicated to Chevy Trax owners and enthusiasts. Come join the discussion …, 2012-2016 Chevrolet Sonic 2013-2017 Chevrolet Trax All equipped with 1.4L engine This bulletin specifically refers to DTC P1101, however even in the absence of this code, there ... catalytic converter for a P0420 code. ID: page of 3 Document ID: 4593367 #P10907C: Check Engine Light On with DTC Pli01 Set -, 2015 CHEVROLET TRAX; 1.4L; 4 CYL; TURBO; 4WD; AUTOMATIC; 143,000 MILES; Hello, I have the P0420 code on my car. I have replaced the o2 sensor and have run Cataclean through it and the code has not cleared. When I called my shop, they said I have two catalytic converters, but I thought I only had one exhaust pipe. ... How to …, P0420 code on chevy trax 1.4l turboP0420 code p0300 help blazer forum protected edited pm 2009 last email P0420 catalyst system efficiency below threshold (bank 1)P0420 code off. How to fix nissan p0420 engine code in 3 minutes [3 methods / only $19.Code p0420 P0420 code test 8l trouble gm catalytic checking converter …, It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. P0171: Fuel Trim System Lean (Bank 1). Check engine light, decreased fuel economy, misfire, hard to find idle. Dirty MAF sensor, vacuum leak, O2 sensor.