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P0420 subaru?
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P0420 subaru?
Ive been getting a P0420 for the last year. Aug 20, 2020 · 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 (is not as efficient as the factory is expecting). Hablamos sobre el codigo de falla dtc p0420, que lo hace activar y como se soluciona. A P0300 code could be related to something in the ignition (spark plug or coil), the fuel injector, compression or fuel contamination. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car. I didn't really didn't bother with it so today I used the BlueDriver ODB2 to connect to my car and found code p0420. This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Eficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). This article explains the P0420 code meaning, causes, symptoms, and how to fix it. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. How to fix you emissions p0420 code for cheap, easy, fast. When it observes an issue with Bank 1 catalytic converter, it triggers the engine code P0420. Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. It doesn't affect any performance, its pretty much just emissions related. Correct all other DTCs first and allow the Catalytic Converter monitor. Hi all, I've been chasing a P0420 code on my base 2007 outback (to prevent the CEL from coming on so my cruise will work). I've reviewed many posts on this, including the P0420 Diagnosis post on the Problems and Maintenance forum, but I'm not understanding some of the basics. I own a 2009 Subaru Outback XT and live in Austin. Aug 20, 2020 · 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 (is not as efficient as the factory is expecting). Soon after p0420 Bank 1 came up on scanner. There are rarely drivability issues associated with P0420. Trail along the north side of the Ninnescah River on the east side of Pratt to this trail to this trail Location: Latitude: 37 Standing Proud Since 1925. That's one of Subaru's plans to make you fix your car instead of ignoring the code. Any DTC or condition that increases emissions or affects sensor readings can cause a converter to fail the ECM tests even if the converter is good. Since then I have had zero CEL come on. Visually inspect the related wiring harness and connectors. Jul 16, 2007 · In my experience, a P0420 is more a code to prove a bad rear O2 sensor than an actual innefficient cat. I am taking a more technical approach than normal to describing what happens. Expert Advice On Improvin. I have had my 2004 subaru outback for 4 months now. Dec 27, 2022 · P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Message here: the P0420 could be caused by something other than a defective cat converter, but if the root cause isn't corrected, a new cat can be damaged Welcome to the Subaru Outback Owners Forum, we have tons of information about your Subaru Outback, from a Subaru Outback Wiki to customer reviews Full Forum Listing. I've been in the process of trying to resolve a reoccurring P0420 code. Compruebe si hay fugas de vacío u otros códigos de problemas relacionados con la mezcla de. 00 to replace it and that's if they can find one, since catalytic converters are on backorder The world's largest online community of Subaru Crosstrek and XV owners, prospective owners, and. Usually this means your catalytic converter needs to be replaced and/or your O2 (oxygen) sensors. These include: P0420 is 'The Subaru Code'. How do I know? I threw a P0420 constantly in my Forester. For most people, the first sign that anything is wrong is the service engine soon light coming on. Nov 30, 2018 · The P0420 code in a Subaru WRX will often be thrown if one of your car’s oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. It can also be caused by an exhaust leak or a bad oxygen sensor. i'm new to subaru vehicles and my 2003 wrx wagon is my first. Look for exhaust leaks as well, as with Honda, replacing your catalytic converter or oxygen sensors and regular servicing can help resolve the issue. Tester The most common fix for P0420 in the Subaru Impreza is a new catalytic converter, followed by an O2 sensor replacement. Jump to Latest Follow. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Model Years 2012 to 2017. P0420 was the only code stored. Trail along the north side of the Ninnescah River on the east side of Pratt to this trail to this trail Location: Latitude: 37 Standing Proud Since 1925. I started with replacing the pcv, code still there, then I used the Seafoam method. P0420 P0303 P0304 P0171 were the codes. Feb 28, 2017 · Cheney Reservoir and Water Quality Studies. Long story short, the car is getting pampered. Cheney Reservoir is located on the North Fork Ninnescah River in south-central Kansas, 20 miles west of Wichita. I'm getting kind of annoyed with throwing money at the problem Also semi-recently replaced the broken MAP sensor with one from the Subaru dealership so I know it's getting accurate readings from the intake. I am taking a more technical approach than normal to describing what happens. Nov 30, 2018 · The P0420 code in a Subaru Forester will often be thrown if one of your car’s oxygen sensors is not functioning correctly. Possible causes of the P0420 code There are several potential causes for the P0420 code in Subaru vehicles. (SOA) has determined that vehicles affected by this Service Program require ECM reprogramming performed with over 100,000 miles and the Check Engine light illuminated with DTC P0420 in the ECM memory. 5 mph and ECM detected amplitudes signals that are too similar during the test. I ordered two new ones from Rockauto and installed them. Oxygen Sensor Malfunction: Faulty oxygen sensors can send incorrect data, leading to a P0420 code. Code Type: Generic - P0420 indicates the same problem whether you're having a Chevy, Honda, or Nissan, etc. The causes of the P0420 code are a bad catalytic converter, an ECM update, an exhaust. 2004 WRX with 50,781 miles, perrin short ram intake and axle back exhaust. There are rarely drivability issues associated with P0420. But would still love to see a. 2005 outback 3. 0 Outback, has the JDM engine Yes, it's running rich, but at the moment, the P0420 is "pending Should I 1. That cleared the code for a few weeks just enough to help me pass my inspection in August. Subaru has issued another recall for its battery. Look for exhaust leaks as well, as with Honda, replacing your catalytic converter or oxygen sensors and regular servicing can help resolve the issue. (FreeSSM and Romraider usually can. My P0420 code started this past February and it has been driving me crazy. 06 per million BTUs on Tuesday, representing a decline of 79% from its August high. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. com) and the part came in 3 days. I got cel P0420 AFR is at 14 I have a Grimspeed v2 gesi catted j pipe, remark catback as well. Usually this means your catalytic converter needs to be replaced and/or your O2 (oxygen) sensors. First time Subaru owner and I couldn't be happier. How to diagnose code P0420 on a Subaru. In the past, I started experiencing P0420 codes around 190K miles. I've fixed the P0420 code on several Subarus by just replacing the downstream O2 sensor. Subaru has issued another recall for its battery. Your car won’t pass an emissions test. Current conditions of Discharge and Gage height are available. Nov 30, 2018 · The P0420 code in a Subaru Tribeca will often be thrown if one of your car’s oxygen sensors is not functioning correctly. This has happened to me before while driving and hitting a rough patch of road. 2002 Subaru Forester L 145000 miles Getting Check Engine Light with Subaru Engine Code P0402: How to Troubleshoot and Fix | JustAnswer P0420 Subaru - avtoschools P0420 Everything You Need to Know - Subaru or Whatever You Drive! - YouTube P0420 - Catalytic Converter 2002 Subaru. All O2 sensor and cat-related (P0420, P015A, P015B). craigslist roanoke pets Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. Do you smell gasoline outside the vehicle at all?. Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. Subaru TSB 11-146-14 Make: Subaru Number: 11-146-14 Title: Reprogramming Files For DTC P0420 Date: 9/24/2014 Models: 2014 Forester Summary: This bulletin announces the availability of reprogramming files to address DTC P0420 which may set as a result of an incomplete ECM calculation during catalyst diagnosis. P0420 is a generic powertrain code that various vehicles can log. Jul 16, 2007 · In my experience, a P0420 is more a code to prove a bad rear O2 sensor than an actual innefficient cat. Having a P0420 issue I've replaced the cat, front and rear o2 sensors and PCV valve. This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Eficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). For most people, the first sign that anything is wrong is the service engine soon light coming on. So it goes on the sensor that is at the cat? And not the first one near the engine? Does this work even if I keep the cat. ) I have looked at many past threads on this but wanted to share my experience with this DTC which recently caused my CEL to come on. I remember this happening to me about 4-5 years ago but all I did was clear the code and i'm pretty sure it never came back until very recently /r/WRX is a place for Subaru fanatics to show off their rides, discuss modifications, mechanical issues. Jul 17, 2024 · Monitoring location 07145200 is associated with a Stream in Kingman County, Kansas. The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). fareway ad le mars After getting the car up to temperature and varifying that the thermostat was working properly, fuel trim was where it needed to be, and all else checked out good, the wave form from the O2 sensor shows a bad CAT. P0420. Cost was ~$110 shipped. Jan 6, 2024 · The P0420 code on a Subaru often can be triggered by a bad catalytic converter or a faulty oxygen sensor on older models. There are rarely drivability issues associated with P0420. P0420 was the only code stored. Aug 20, 2020 · 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 (is not as efficient as the factory is expecting). Welcome to the Subaru Outback Owners Forum, we have tons of information about your Subaru Outback, from a Subaru Outback Wiki to customer reviews. Nope. Pony Express used to make an MIL Eliminator for Subaru, but I can't find it anymore. How do I know? I threw a P0420 constantly in my Forester. I am trying to get my car to pass inspection, but I have P0420 problem. First to verify the presence of the P0420 and/or P0430 DTCs but to also check for any others that might be recorded in the ECM. Jan 6, 2024 · The P0420 code on a Subaru often can be triggered by a bad catalytic converter or a faulty oxygen sensor on older models. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Causes of the P0420 Code. P0420 is a diabolical code that IMO is best viewed with suspicion. For most people, the first sign that anything is wrong is the service engine soon light coming on. There are rarely drivability issues associated with P0420. Out of a desire to help this community grow and prosper, The First National Bank of Cunningham was founded. The most common fix for P0420 in the Subaru Legacy is a new catalytic converter, followed by an O2 sensor replacement. Try replacing the front o2 sensor first. P0420 is a cat efficiency code caused by the misfires, too much unburnt fuel going through the exhaust. Nov 30, 2018 · The P0420 code in a Subaru Outback will often be thrown if one of your car’s oxygen sensors is not functioning correctly. ottumwa daily courier obituaries Check for vacuum leaks or other fuel mixture-related engine codes. Idle mixture is out of specifications. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Want people to stop needing to ask what exact car you have? year -model -engine -trans, scroll down to "vehicle details" at this link: Subaru Outback Forums Retired Outbacks: 2002 2. I got a 2000 subaru outback, 90,000 miles a few months ago, I love it, it is my first and I am sold! Just recently my check engine light came on, I took it to the free autozone reading, code P0420, I replaced the 02 sensor coming out of the catalytic converter, reset my engine light by unplugging the battery for 20 minutes. In this video I clean out my catalytic converter with citric acid. May 17, 2023 · The P0420 code is an indicator of a problem with the catalytic converter in your Subaru. Cause: Loose or damaged exhaust system parts. For most people, the first sign that anything is wrong is the service engine soon light coming on. The car is bone stock What does a functioning sensor in a subaru look like 2017 - Outback 2. we see it all the time. Dec 27, 2022 · P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. May 17, 2023 · The P0420 code is an indicator of a problem with the catalytic converter in your Subaru. I started with replacing the pcv, code still there, then I used the Seafoam method. Recently the check engine light has come on and is showing the P0420 code. P0420 is one of the more common trouble codes that we see. Do you smell gasoline outside the vehicle at all?. There are rarely drivability issues associated with P0420. This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Eficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). " What does the P0420 Code Mean? Engine/Traction Control on, Cruise blinking code P0420 ('09-'13).
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It's the job of the rear o2 sensor to sniff the exhaust, and make sure the cat is working properly. There are rarely drivability issues associated with P0420. Learn what Catalyst System Efficiency Below Threshold Bank 1 means, location and how to repair? The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency P0420 Subaru Catalyst System Efficiency Below Threshold. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components. It can also be caused by an exhaust leak or a bad oxygen sensor. It can also be caused by an exhaust leak or a bad oxygen sensor. For most people, the first sign that anything is wrong is the service engine soon light coming on. Aug 20, 2020 · 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 (is not as efficient as the factory is expecting). Visually inspect the related wiring harness and connectors. I've read through them, and learned a lot, but have a more specific question regarding the light I'm hoping some of you might help me out with I'm a brand new, first time subaru owner. However, there are a few very narrow exceptions, like monitoring your kids or employees. Vehicle is driven > 43. Yes, I read the -very informative- "P0420 Diagnosis" thread. The temperature should remain above 190. Check for vacuum leaks or other fuel mixture-related engine codes. walgreens pharmacy laguna blvd elk grove The P0420 is "cat below threshold efficiency". Cost was ~$110 shipped. First, make sure you're all cau. P0420 was the only code stored. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. I explained my situation and mentioned to Rear O2 sensor issue of the past. Check for Other Codes. Jul 22, 2018 · P0420 code stands for “Catalyst System Efficiency Below Threshold (Bank 1). There are rarely drivability issues associated with P0420. Learn what causes the P0420 code in Subaru models and how to diagnose it with technical testing and data analysis. Check for vacuum leaks or other fuel mixture-related engine codes. Your car won’t pass an emissions test. Far less expensive than replacing the cat. Car has the California emissions package on it So it has a special catalytic convertor and heads on it. Daily: 2005 Subaru Forester XT 5MT Weekend: 1999 Mazda Miata 5MT Beater: 1991 Toyota Pickup 5MT Like Forester 2001 L - Stock 101k Miles P0420 - Catalytic Converter Efficiency Below Threshold The forester has been throwing this code for a few months now, typically shows up on long highway runs (but to be fair, that is the vast. We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester Full Forum Listing. This code drives me crazy! This also stops AWD From working and the cruise control I would love to know or be able to use my AWD. 5L, helpful in upgrading the exhaust system to improve vehicle. 5 mph and ECM detected amplitudes signals that are too similar during the test. craigslist san francisco cars trucks A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2 About 8/10 months ago or so, a P0420 code popped up, I did nothing about it for awhile since the car seemed to be running fine We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester Full Forum Listing How to diagnose code P0420 on a Subaru Legacy. Subaru’s Lineartronic CVT design uses a chain rather than a cable to join the two pulleys of the CVT system as in most other CVT designs. P0420 was the only code stored. My inspection is due in April. Thread starter vicpage; Start date Dec 26, 2023; V Joined Dec 26, 2023 Messages 2 Reaction score 0 My OBDII reader told me it was a P0420 code-catalyst system efficiency below thresh hold bank 1. I am taking a more technical approach than normal to describing what happens. The cel fires two identical p0420 codes about once a week. Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. For most people, the first sign that anything is wrong is the service engine soon light coming on. First, change your driving habits. Out of a desire to help this community grow and prosper, The First National Bank of Cunningham was founded. Usually idicates the cat has failed or is failing A forum community dedicated to Subaru Impreza and STI owners and enthusiasts. There are rarely drivability issues associated with P0420. There are rarely drivability issues associated with P0420. ” When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. I have replaced all 3 cats(2 were damaged from the exhaust being banged around and you could hear the catalyst rattling). Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. There are rarely drivability issues associated with P0420. kake news P0420 was the only code stored. My P0420 code started this past February and it has been driving me crazy. For most people, the first sign that anything is wrong is the service engine soon light coming on. Out of a desire to help this community grow and prosper, The First National Bank of Cunningham was founded. Something else? I read the odb on my car a (2008 Subaru Outback) it came up with these three codes P0303 P0304 P0420. If you're in a DIY mood, do a citrus clean on your cat. ” When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. It doesn't affect any performance, its pretty much just emissions related. After every timing belt job P0420. In 1925, a group of local people saw a need for a bank that understood the needs and values that were important to the citizens of the Cunningham community. Cause: Loose or damaged exhaust system parts. Nov 30, 2018 · The P0420 code in a Subaru Legacy will often be thrown if one of your car’s oxygen sensors is not functioning correctly. P0420 was the only code stored. It can also be caused by an exhaust leak or a bad oxygen sensor. It is only telling you that the rear O2 sensor is not getting a clean exhaust reading. Usually this means your catalytic converter needs to be replaced and/or your O2 (oxygen) sensors.
A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components. Common causes can include failed or malfunctioning components, such as the oxygen sensor, fuel system, EGR system, and exhaust system. Forester 2001 L - Stock 101k Miles P0420 - Catalytic Converter Efficiency Below Threshold The forester has been throwing this code for a few months now, typically shows up on long highway runs (but to be fair, that is the vast majority of my driving). I've not found much info out there on AM Cats other than it's generally not recommended due to quality/dependability and fitment - yet the OEM Cat costs over half what I paid for the dang car!. 2 things can make the sensor throw the code. May 17, 2023 · The P0420 code is an indicator of a problem with the catalytic converter in your Subaru. This is a quick and easy fi. It can also be caused by an exhaust leak or a bad oxygen sensor. hennie gamefowl Aug 20, 2020 · 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 (is not as efficient as the factory is expecting). You have to check the underlying systems that effect the performance of the engine. Probably 'yes'. checked intake and hoses, exhaust tor leaks and valve adjustment I have tried 3 differen. Cause: Loose or damaged exhaust system parts. riding horses crossword clue 5 letters While it is often called a SUV, the Forester uses a car chassis and unibody. So are parts required to fix this pesky emissions code? In this case we get a good example of where the "money light" gets its n. Oct 30, 2012 · 1996 Subaru Legacy AWD wagon, manual transmission. Check for Other Codes. soft surroundings tops and the P0420 code means the rear 02 sensor is reading that the catalytic converter is not doing ist job. Dec 27, 2022 · P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. Feb 28, 2017 · Cheney Reservoir and Water Quality Studies. Message here: the P0420 could be caused by something other than a defective cat converter, but if the root cause isn't corrected, a new cat can be damaged Welcome to the Subaru Outback Owners Forum, we have tons of information about your Subaru Outback, from a Subaru Outback Wiki to customer reviews Full Forum Listing. either the sensor is borked, which means you buy a new sensor, or the sensor is functioning properly, which means your cat may need. 4 ohms as do pins 2+3 I still have an issue though, Intermittently, the check engine light/cruise control light gets triggered.
The P0420 code usually came back with 1 to 2 years in the reviews. If DTC P0420 is found to be stored in the ECM, follow the diagnostic procedures outlined below. Thanks for all the great information. You may have a too low thermostat even though BA manufactures for Subaru. Nov 30, 2018 · The P0420 code in a Subaru WRX will often be thrown if one of your car’s oxygen sensors is not functioning correctly. the CEL came on with a P0021 code. P0420 was the only code stored. Come join the discussion about performance, engine builds, exhaust, modifications, troubleshooting. Learn how to diagnose and fix this issue with a professional mechanic at Goodhood Auto. Obviously I went to the Subaru dealership to see if they could do a deeper diagnostic and they said it was the catalytic converter and I needed the two O2 sensors and quoted me over 4k to do the job The P0420 code signals a low catalyst system efficiency. For most people, the first sign that anything is wrong is the service engine soon light coming on. Find out the common symptoms, possible solutions, and … P0420 code stands for “Catalyst System Efficiency Below Threshold (Bank 1). Idle mixture is out of specifications. Cheney Reservoir is the primary drinking water supply for the city and a popular recreational resource for the region. The P0420 code stands for "Catalyst System Efficiency Below Threshold (Bank 1). Trouble Code - P0420 Catalyst System Efficiency Below Threshold (Bank 1). Honestly, I think Subaru uses the P0420 to increase dealer repair traffic. Jump to Latest Follow. This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Eficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). Jan 6, 2024 · The P0420 code on a Subaru often can be triggered by a bad catalytic converter or a faulty oxygen sensor on older models. savannah outlet center ” When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Pony Express used to make an MIL Eliminator for Subaru, but I can't find it anymore. Here's a good P0420 diagnostic order for the Subaru Legacy: 1. Trail along the north side of the Ninnescah River on the east side of Pratt to this trail to this trail Location: Latitude: 37 Standing Proud Since 1925. The car is an 02 Subaru Outback Wagon with about 150,000 miles. Some history: *97000 miles-head gaskets replaced. There are rarely drivability issues associated with P0420. If the cats are failing, the waveform would be there when the car is operating at normal temperature. The difference between the "normal" and "OBD" modes is apparent. I've got a 2004 Subaru Outback Base model. Nothing was wrong with the car, the benzin (petrol) was either low octane (lower than the minimum recommended 95) or it had lead for some reason. This page is meant to help you troubleshoot the Subaru Liberty P0420 trouble code. In 1925, a group of local people saw a need for a bank that understood the needs and values that were important to the citizens of the Cunningham community. Nov 30, 2018 · The P0420 code in a Subaru Forester will often be thrown if one of your car’s oxygen sensors is not functioning correctly. 2014 Subaru Outback 2. I'm getting kind of annoyed with throwing money at the problem Also semi-recently replaced the broken MAP sensor with one from the Subaru dealership so I know it's getting accurate readings from the intake. It doesn't really 'fix' anything (except for the bleeping CEL light ;-) I've got a 2015 Subaru Forester with 175k miles that runs great but the other day all my dash warning lights went off. I've reviewed many posts on this, including the P0420 Diagnosis post on the Problems and Maintenance forum, but I'm not understanding some of the basics. Dec 27, 2022 · P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. The code it came up with was P0420. Jan 18, 2011 · One of the more common codes we see on the Subaru, is P0420 Catalytic Converter Efficiency Below Threshold. runess login adp Check Engine light came back on only two days after, so I ran the codes and got P0420 again Welcome to the Subaru Outback Owners Forum, we have tons of information about your Subaru Outback, from a Subaru Outback Wiki to customer reviews. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components. It covers Subaru Liberty P0420 meaning, symptoms, causes, and possible solutions. Jan 18, 2011 · One of the more common codes we see on the Subaru, is P0420 Catalytic Converter Efficiency Below Threshold. I am still confronting a P0420 code. Subaru has issued another recall for its Solterra EV over concerns that hub bolts on the wheels may loosen and cause it to detach. Visually inspect the related wiring harness and connectors. Dec 8, 2012 · My P0420 code started this past February and it has been driving me crazy. Had it checked at local parts store and code was P0420 catalyst efficiency below threshold. Out of a desire to help this community grow and prosper, The First National Bank of Cunningham was founded. Yes, I read the -very informative- "P0420 Diagnosis" thread. That is the issue with the P0420. This is the only code the car is throwing. Jan 6, 2024 · The P0420 code on a Subaru often can be triggered by a bad catalytic converter or a faulty oxygen sensor on older models. Usually this means your catalytic converter needs to be replaced and/or your O2 (oxygen) sensors.