Subaru p0420 - 2009 Subaru Outback P0420. It was diving awesome with no sign of issue when I got a CEL and my cruise and stability control lights came on and the systems disabled. This happened on the way home from purchasing the car. No sign of issues on my test drive Tested the code and it showed P0420.

 
The most common fix for P0420 in the Subaru Legacy is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Legacy 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 Subaru Legacy: 1. Check for Other Codes.. Food breezewood pa

My P0420 code started this past February and it has been driving me crazy. I started with replacing the pcv, code still there, then I used the Seafoam method. That cleared the code for a few weeks just enough to help me pass my inspection in August.The P0420 on my car was caused by a misfire. Several have been caused by O2 sensors or MAF sensors failing. Cardoc has a pinned post about the issue. P0420 Diagnosis ... Subaru Outback 2.5L Front Catalytic Converter 2013 TO 2014. Front Catalytic Converter Direct Fit. The pipe constructed from 14 gauge tubing, with original OE style …Chapter/Region: NESIC. Location: Lake George , New York. Vehicle: 2021 WRX BASE. Pure Red. Code P0420 and P0137 after Invidia Catted J pipe install on 2021 wrx. So , last month I installed my Invidia catted j pipe and with it the Cobb stage 2+ big sf intake on my 2021 WRX 6-MT . I also have a remark mid pipe and axle back muffler …p0420 maybe a rear o2 sensor at this stage,...although other things produce it such as a a loose exhaust gasket before the last o2 sensor. p0442 and p0456 both indicate of a minor evaporative system leak,...such maybe a hose or something in the area of the gas tank and the attached evap system that has become cracked overtime. be it a …Hi all, I have a 1999 Outback S/W 95K. I bought it used and the head gasket was changed by previous owner at 86K. Shortly after buying it two months ago the check engine light went off. The code was P0440 - Evap Emissions Malfunction. After searching the internet and talking to mechanics I see it is a difficult problem to diagnose and correct.Causing bad readings which throws a code telling you that you need a new cat or O2 sensor. Start up front and move your way to the exhaust. Hey Tyler, air filter is stock, I haven’t changed it yet, I’ll check right when I get off work. 11-16-2017, 10:15 AM. # 6. gn4rwhals vbmenu_register ("postmenu_45422896", true);Here are the most common causes of P0420 in the Subaru Impreza: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …The car is a 2005 Outback 3.0R with 130000 Km on it. That minor rant aside, the CEL popped up recently (following my wife running out of gas) and the code was a P0420 catalytic inefficiency. Did my reading on this forum and did the following: - Checked exhaust for leaks. - Replaced PCV. - Replaced air filter.Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test.The P0420 code is thr...Air can and does enter cracks or small holes in the exhaust. A system in good shape does not have measurable pressure in it. The exhaust flowing through the pipe can draw ambient air in through openings. A partially blocked converter won't necessarily throw a P0420 code if it is still working as a catalyst.The P0420 code is a common issue that many Subaru Impreza owners experience. This subheading aims to provide a detailed explanation of what the code means and its implications for the vehicle. The P0420 code signifies a problem with the catalytic converter efficiency in the exhaust system of the Subaru Impreza.104 posts · Joined 2008. #2 · Oct 3, 2011. I as well have been dealing with the P0420 and a local subie dealer out here mentioned basically to clear the code and see how long it takes for it to come back up. Meanwhile, run fuel cleaner through the system to clear up the injectors and the 02 sensors. You said your putting the anti-foulers on ...21417 posts · Joined 2006. #5 · Jul 10, 2014. However, when the light is cleared, while using the cruise control there is a slight hesitation present ONLY while the cruise is being used. There is no hesitation or issue present otherwise. It's possible that the P0420 and the hesitation are related, and that the hesitation is more noticeable ...P0420 Code - Catalyst System Efficiency Below Threshold Bank 1. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. ... P0420 Subaru Catalyst System Efficiency Below …VSurfn. 1329 posts · Joined 2014. #2 · Jul 22, 2018 (Edited) P0420 code stands for “Catalyst System Efficiency Below Threshold (Bank 1).”. When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. Usually this means your catalytic converter needs to be replaced and/or your O2 (oxygen) sensors.The P0420 Diagnostic Trouble Code is a clear indication that your vehicle's catalytic converter is not efficiently functioning. The Catalytic Converter is part of the …Catalytic Converter Replaced still showing P0420. I took my 2003 outback into my usual mechanic for P0420 codes and he replaced the Catalytic Converter. Check Engine light came back on only two days after, so I ran the codes and got P0420 again. I cleared them and chalked it up to the new CC needing a few days.Facebook page “likes” are an excellent way to gauge a company’s or brand’s engagement with potential customers. To better understand how to market your Facebook page, you should tr...If you find a P0420 code in your Subaru or Honda, it’s most likely the catalytic converter to blame. It can also be caused by an exhaust leak or a bad oxygen sensor . Check for vacuum leaks or other fuel mixture-related engine codes.Jan 14, 2022 · That's one of Subaru's plans to make you fix your car instead of ignoring the code. In my experience the P0420 code has always been fixed (4 times on three different cars, and the second time on one car was the other bank on a 3.6R) by replacing the downstream O2 sensor. Did you replace it with a good brand-name sensor or whatever you found ... Visit me at: http://www.ericthecarguy.com/O2 Sensor Video: https://www.youtube.com/watch?v=NIzcztO-CCsDiscussion about this video: http://www.ericthecarguy...Here are the most common causes of P0420 in the Subaru Legacy: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …633. 176K views 8 years ago. This low kilometer Subaru Impreza flags a P0420 Catalyst efficiency fault code very quickly. The rear O2 sensor would behave almost like the catalytic converter had...Here are the most common causes of P0420 in the Subaru Forester: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …The most common fix for P0420 in the Subaru WRX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your WRX 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 Subaru WRX: 1. Check for Other Codes.OBD II P0420 Trouble Code Subaru. In Subarus, P0420 often indicates an issue with the front oxygen sensor, causing it to read incorrectly. The Outback, Forester, Impreza, and Legacy models are most prone to this code. Try replacing the front o2 sensor first. Use an OEM Subaru replacement part for reliability.P0420 Cat below threshold, this has failed due to rich fuel mixture caused by mass air flow sensor and this also damaged the AF sensor. Rear O2 is reading, on removal sensor may be contaminated and if so recommend replacement. ... Alternately contact subaru of america directly pursue them fixing it for "one time goodwill" etc no way should …4 days, 1 subaru wideband sensor, and 3 drive cycles later, I have clearing subaru readiness monitors down to a T. And the wide-band that came with my AEM failsafe gauge is looks to be the same model as the subaru wideband, except the resistors are different. But, the P0420 code was still there.Oct 19, 2015 · Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. A P0420 due to an oil filter is unheard of. More than likely the P0420 was intermittent and was going to go out and come back at some point no matter what you did. H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6. traildogck. GM CEO Mary Barra sees the automaker selling personal autonomous vehicles by the end of the decade by leveraging technology from its self-driving subsidiary Cruise, according to co...Subaru Code: P0420 Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. Idle mixture is out of specifications. Vehicle is driven > 43.5 mph and ECM detected amplitudes signals that are too similar during the test. Cause: Loose or damaged exhaust system parts.2001 OB H6 infamous p0420 help deciphering it. I have an ultragauge and for about the last year would get a random pending check engine code p0420, this is only like 4 or 5 times in an 18 month period. For those unfamiliar with the ultragauge a pending code is a pre code not enough to throw an official check engine but its getting close.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 ...Generally P0420 code can be set by exhaust leaks, bad O2 sensor or a bad cat. P0420 definately seems to be a common occurrance with some Subaru's. PZEV might have more. and I was reading those PZEV 2005-2009 cars also race their engines on first cold up, to heat the cats up fast and to stop the stink. (like H6 ones do).OBD II P0420 Trouble Code Subaru. In Subarus, P0420 often indicates an issue with the front oxygen sensor, causing it to read incorrectly. The Outback, Forester, Impreza, and Legacy models are most prone to this code. Try replacing the front o2 sensor first. Use an OEM Subaru replacement part for reliability.CAOVF: Get the latest China Overseas Land & Investment LtdShs stock price and detailed information including CAOVF news, historical charts and realtime prices. Indices Commodities ... This is a very common Subaru code. It ranges from seemingly "unfixable" (i.e., reflash the ECU to ignore it), catalytic converter replacement, rear O2 sensor, exhaust leak, all kinds of stuff. I wouldn't worry too much unless other symptoms/codes appear. My car throws a P0420 about every 1000-2000 miles (edit: and still gets high 20's average ... the most common problem for P0420 seems to be a bad O2 sensor. front O2 sensor needs to be OEM at about $100, rear O2 sensor can be parts store brand >$100. I also replaced my sticking EGR valve when i replace my front O2, dont know if that had anything to do with P0420. now it could also be a leak in the exhaust, replacing the …P0420 Subaru Catalyst System Efficiency Below Threshold Bank 1. As the code description implies the P0421 Subaru 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). Replacing the oxygen (O2) sensors may sometimes fix the ...Home SubaruP0420 Subaru DTC P0420 Make: Subaru Code: P0420 Definition: Catalyst System Efficiency Below Threshold (Bank 1) Description: Engine stalls. Idle mixture is out of specifications. Vehicle is driven > 43.5 mph and ECM detected amplitudes signals that are too similar during the test. Cause: Loose or damaged exhaust system parts.The six business groups of Alibaba are Cloud Intelligence Group, Taobao Tmall Commerce Group, Local Services Group, Cainiao Smart Logistics, Global Digital Commerce Group, and Digi...Podcast episode breaking down myths about ADHD in both adults and children (Attention Deficit Hyperactivity Disorder) For some, ADHD is a debilitating disorder. For others, it’s se...4 days, 1 subaru wideband sensor, and 3 drive cycles later, I have clearing subaru readiness monitors down to a T. And the wide-band that came with my AEM failsafe gauge is looks to be the same model as …The P0420 code in a Subaru Outback is typically triggered by issues related to the vehicle’s catalytic converter. One common cause is a faulty or damaged catalytic converter, which may be clogged or no longer functioning properly. Another possible cause is an oxygen sensor failure, specifically the downstream oxygen sensor, which measures …In this video, you'll learn the causes and solutions of the P0420 code. The causes of the P0420 code are a bad catalytic converter, an ECM update, an exhaust...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code SUBARU P0457 Saving Repa...Jan 29, 2024 · The P0420 code in a Subaru Outback is typically triggered by issues related to the vehicle’s catalytic converter. One common cause is a faulty or damaged catalytic converter, which may be clogged or no longer functioning properly. Another possible cause is an oxygen sensor failure, specifically the downstream oxygen sensor, which measures the ... Here's an Amazon link to that impact gun → http://www.amazon.com/gp/product/B00BWFIKZO/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASI...The P0420 is a finicky code. There is a range of "acceptable" parameters that Subaru has set. If the O2 sensor sees a value that is outside of that range, even for just a fraction of a second, you get the P0420. Adding the extension doesn't stop the O2 sensor from working, it just doesn't get the immediate read, but more of a mixed read.Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. A P0420 due to an oil filter is unheard of. More than likely the P0420 was intermittent and was going to go out and come back at some point no matter what you did. H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6. traildogck.59 posts · Joined 2015. #1 · May 23, 2020. I'd greatly appreciate some help troubleshooting a P0420 code on my '07 OB. 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. Many of the posts refer to checking for exhaust leaks.Now, to effectively diagnose the issue with a P0420 using aftermarket software and determine where the problem lies, and we will use RomRaider since it is widely used by Subaru owners for various reasons, log the data from the rear O2 sensor.Only way to keep the light off is to replace it. As u/oldslim pointed out, the second (downstream) O2 sensor is used by the ECU to determine if the catalytic converter is working at full efficiency. If the ECU judges the efficiency to have fallen below an acceptable threshold, the P0420 code is the result.Subaru of America, Inc. (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. The catalytic converter efficiency test must also indicate replacement is necessary. For all other vehicles, the ...How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av...P0420 Hard to start Help! 2002 Forester L. 136k Manual transmission. Bought this car about a month ago (first subaru) about a week into owning the car it developed a small intermittent start issue. Basically when the engine is WARM it will crank 2-3 times then misfire. Turning the key off then back on it almost always cranks once and …Facebook page “likes” are an excellent way to gauge a company’s or brand’s engagement with potential customers. To better understand how to market your Facebook page, you should tr... Here's an Amazon link to that impact gun → http://www.amazon.com/gp/product/B00BWFIKZO/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASI... The P0420 on my car was caused by a misfire. Several have been caused by O2 sensors or MAF sensors failing. Cardoc has a pinned post about the issue. P0420 Diagnosis ... Subaru Outback 2.5L Front Catalytic Converter 2013 TO 2014. Front Catalytic Converter Direct Fit. The pipe constructed from 14 gauge tubing, with original OE style …P0420 Code: Causes, Meaning, Symptoms (and How to Fix it) (mechanicalboost.com) 2021 Crosstrek Limited Crystal White / Black leather. (MNRF - 33) Moonroof Package W/Nav/HK AUDIO. Auto-dim Mirror/Homelink/Compassr + Side moldings All Weather Mats. Outside mirror Auto Dim Rear Bumper Cover LED …PO420 code. Thanks for taking the time to help. I have a 2004 Outback 2.5L automatic. J259. Code P0420. I've replaced the bank 1 sensor 1 with a Denzo brand. I've ran 2 different cleaners through the gas tank. I got the car with a blown head but had it fixed. I replaced the sensor after the head was fixed.2010 outback2.5 code p0420. Hi all! Last night after hitting a rough patch of road on the highway most of my dash lights lit up. Cruise and E brake light blinking, check engine and traction came on too. I took it to autozone just to get the code and p0420 Bank 1 came up in the test results.One of my favorite threads for this is the $5 fix :wink: When you get the P0420 CEL code, the cause can be: A faulty or failing front O2 sensor (if your gas mileage has dropped off with hesitation, backfires & an overly sooty exhaust tip). An exhaust air leak ahead of the rear O2 sensor (rusted or cracked pipe). A failed CAT.Subaru manufactures its cars in two factories, one located in Japan and the other in the United States. Only the Impreza, Legacy sedan, Tribeca, and Outback are produced in the Uni...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).Air can and does enter cracks or small holes in the exhaust. A system in good shape does not have measurable pressure in it. The exhaust flowing through the pipe can draw ambient air in through openings. A partially blocked converter won't necessarily throw a P0420 code if it is still working as a catalyst.If the check engine light comes on in your Subaru there is always a corresponding code set in the computers memory. You can …The "official" fixes for a P0420 code are: replace the rear O2 sensor, replace the front O2 sensor and replace the cats. - Replacing the rear O2 sensor will accomplish nothing, IMHO - Replacing the front sensor is a good idea, since it is responsible for running the engine properly. Sadly, it probably won't solve the P0420 code issue.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code SUBARU P0457 Saving Repa...The P0420 code is a common issue that many Subaru Impreza owners experience. This subheading aims to provide a detailed explanation of what the code means and its implications for the vehicle. The P0420 code signifies a problem with the catalytic converter efficiency in the exhaust system of the Subaru Impreza.Here are the most common causes of P0420 in the Subaru Legacy: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …4 days, 1 subaru wideband sensor, and 3 drive cycles later, I have clearing subaru readiness monitors down to a T. And the wide-band that came with my AEM failsafe gauge is looks to be the same model as …double check battery connections. catch-up on any any postponed maintenance. the P0420 often is due to something unrelated to the cat conv so, that should be the last thing you suspect. Exhaust leaks, vacuum leaks, weak spark.... Time Flies Like an Arrow, Fruit Flies Like a Banana! Hans747. Like.JENNISON GROWTH EQUITY FUND 6- Performance charts including intraday, historical charts and prices and keydata. Indices Commodities Currencies StocksPodcast episode breaking down myths about ADHD in both adults and children (Attention Deficit Hyperactivity Disorder) For some, ADHD is a debilitating disorder. For others, it’s se..."His was a life, full of gallantry, sacrifice, love for Nigeria and ever willing to die in order to keep it one." A good number of Nigerians have been through life under military r...Desferal (Injectable) received an overall rating of 7 out of 10 stars from 1 reviews. See what others have said about Desferal (Injectable), including the effectiveness, ease of us...Code P0420 Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.How to diagnose code P0420 on a Subaru Legacy. 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. You may experience a very slight reduction in engine power from reduced exhaust flow ...The most common fix for P0420 in the Subaru WRX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your WRX 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 Subaru WRX: 1. Check for Other Codes.This is a very common Subaru code. It ranges from seemingly "unfixable" (i.e., reflash the ECU to ignore it), catalytic converter replacement, rear O2 sensor, exhaust leak, all kinds of stuff. I wouldn't worry too much unless other symptoms/codes appear. My car throws a P0420 about every 1000-2000 miles (edit: and still gets high 20's average ...The diagnostic process for the code P0420 is as follows: Sensor harness wiring and connector : carry out an exhaustive visual inspection of bank 1 downstream oxygen sensor wiring and connectors. Pay special attention to burnt, corroded, open, shorted to ground or deteriorated wiring and/or connector.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 ...Nov 30, 2018 · The most common fix for P0420 in the Subaru WRX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your WRX 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 Subaru WRX: 1. Check for Other Codes.

The P0420 code will not likely be caused by, or cleared by removing and replacing, the gas cap. The gas cap could be faulty, and is causing the warning lights to come on for some other code, but it's not the P0420. Just because at one time the lights came on and code then was a P0420, doesn't mean that every time the lights come on, …. Fitsnews murdaugh

subaru p0420

P0420 Code Chasing - Graph of O2 Sensor. 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). Check engine light first came on with P0420 after about a hundred miles. I reset the code, and after about 60 miles I saw the code "pending" again though it wasn't confirmed and no ...Eight hours a day is way too much at some Swedish companies. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners. I agree to Money's Ter...Jan 10, 2012 · 63 posts · Joined 2011. #1 · Jan 10, 2012. I have a 2004 OBW and it keeps throwing the P0420 catalytic system below threshold code. The car is bone stock. It is drive by wire and has the California emissions on it. It's engine is a model EJ259 if I remember correct. I've tried using the anti-foulers, and even the electronic fixes in the rear ... The diagnostic process for the code P0420 is as follows: Sensor harness wiring and connector : carry out an exhaustive visual inspection of bank 1 downstream oxygen sensor wiring and connectors. Pay special attention to burnt, corroded, open, shorted to ground or deteriorated wiring and/or connector. 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 ... P0420 Diagnosis: Subaru Tribeca. The most common fix for P0420 in the Subaru Tribeca is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Tribeca 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 Subaru Tribeca: 1.Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 isthe international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. NUMBER:09-110-23R DATE: 10/09/235784 posts · Joined 2018. #2 · Apr 12, 2023. There is a whole thread on this forum about the P0420 code, what can cause it and how to diagnose the cause. If you take the time to read the first 10 to 20 posts of that thread you may be able to diagnose the cause. The code can be caused by bad fuel, faulty O2 sensors, poor electrical …This code simply means that somewhere in the chain of events that controls the overall performance of the engine there is a problem and you have to find it. List of …I have the dreaded P0420 code. It is intermittent. Base engine. No turbo. Just purchased this 2006 outback with 145k miles. Has a brand new cat and new front 02 sensor. ... Subaru runs a wideband O2 in the front. The 0-1v readout that most other cars have, does not apply to Subaru. The rear O2s are the standard 0-1v units.Dec 4, 2023 · 2010 outback2.5 code p0420. Hi all! Last night after hitting a rough patch of road on the highway most of my dash lights lit up. Cruise and E brake light blinking, check engine and traction came on too. I took it to autozone just to get the code and p0420 Bank 1 came up in the test results. The CEL would turn on and off occasionally so I changed the Wires, Plugs and coil pack and went ahead and did the 2 - O2 Sensors. Now over time I have earned 2 additional codes for my efforts. I have all three, (P0301, (Cylinder 1 Misfire Detected), P0303, (Cylinder 3 Misfire Detected), & P0420, (Catalyst System Efficiency Below …What Does the P0420 Code in a Subaru WRX Mean? The P0420 Code in a Subaru WRX usually means there's a problem with the catalyst efficiency. This means …Catalytic Converter Replaced still showing P0420. I took my 2003 outback into my usual mechanic for P0420 codes and he replaced the Catalytic Converter. Check Engine light came back on only two days after, so I ran the codes and got P0420 again. I cleared them and chalked it up to the new CC needing a few days..

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