I wish you would have purchased the gaskets from us, the brand you mentioned is just not a good option for Subaru and may in fact not be sealing. Now its permanently on. I have a 2005 Subaru Legacy Wagon Limited and I get code P0420. Your article is the most helpful that I have found thus far. While this benefits the performance of the engine, it compromises the structural durability of the shell. Should I have asked for a Prenup.? Because of the awkward angles and the small size of the Subaru converters--especially in the front Y-pipe--finding the right size and then welding it into the existing pipe without compromising how it needs to bolt to the engine and the remaining exhaust system is very difficult. Had it replaced, and light is out. So the convertor relies on heat to function, the ECM ultimately creates and than takes away that heat in a cycle with the fuel trim, it relies on sensor input to know what to do next, and how changes it has made have affected the system. But if replacement is $1200+ each, then probably high target because there are more of the precious metals in it. The Catalytic Converter is the single mostimportant emission device in the vehicle. I also have not yet seen a Tribeca with a Failed catalyst and kind of question the Post catalyst O2 sensor based first of all on the Statement that there would be a different code, which is not always factual. And yet the first couple times I checked it when all this started happening, it DID seem loose! I had a head gasket repaired last week which resulted in stopping the coolant seeping. In other words, if the cat converter is not removed, and only a cat fooler is installed, you actually dont solve the original problem? All catalytic converters fail eventually since its a wearing part. So I am hoping you can suggest what my next moves with my Subaru dealer here should be as i am very reluctant to rush into replacing the CC,s. I was able to graph the 2d O2 sensor. So at this point all that has been learned is that the ECM is correct and there is a function issue, but until more testing is done we dont know the why. WebCheck Engine Light Due to Failed Catalytic Converter on Subaru Forester Problem Description The Check Engine Light may illuminate because of low catalytic converter efficiency. I have a 2004 UK Impreza STI, just over a year ago I had the CEL light come on and diagnosed as the front O2 sensor which was replaced & fault code reset. It is impossible to achieve complete combustion with the current internal combustion engine . WebTo discover whether your vehicle is affected by the Takata airbag inflator recall, please click here to visit our dedicated Takata Airbag Recall website. These are Subarus sold in the lower 48 states and Alaska. The catalytic converter was allegedly replaced at a Subaru dealership under recall. Very familiar with that converter and sensor configuration. Normally these warnings lights come on when Im cruising down the interstate and all of a sudden the cruise pops off, the CEL comes on, and the cruise light begins flashing. It Runs great and doesnt use any fluids at all. Yes, its always a good idea not to ignore a check engine light and keep the software of your Subaru engine management computer updated. P0420 code was detected, and Subaru dealer eventually performed catalytic converter replacement under warranty. If you dont have any good advice I have a 2000 subaru outback for sale. They stated the head gasket was leading and it needed a new cv boot. The front Y-pipe assemblies can cost twice as much money to replace as the rear converter assembly. Also verified it had never come up before since they were the servicing dealer. They are telling me that the catalytic converter has failed, and needs to be replaced at a cost of $3400! The catalytic converter aids the conversion of these. They said could come on in 2 days or 2 months, or longer. Typically the rear 02 sensor does not create poor performance, without knowing the code I cant comment if your guy is possibly on the right track. It does not seem to be running any different. Should I just bite the bullet and have it replaced? So I had both front bearings replaced. Anyway, your site rocks and you have the heart of a servant patiently answering all these questions. Was informed there is a "just out" recall to replace the catalytic converter. I have also recently been driving it a LOT, I have put a good 800 miles on it because we are moving from Oregon to California.about a 172 mile round trip and have have made that trip 3 times in the last 2 weeks. What must be done next is to determine the correct answer to that question, by testing the rear o2 sensor and by performing a catalyticconverterefficiency test and evaluating fuel trim. Over time, carbon deposits accumulate and clog up the catalytic converter, especially if the vehicle has racked up a lot of miles. 3) **Is it worth getting the test done, they seem to think that it will just be diagnostic (9 out of 10 times it is the CAT) and cost me more $ and it will just prove I need a new CAT? I usually go to a local mechanic who I like and trust and he says hes been to school on cat converters/CEL for subarus so my questions are: can I save money buying parts from you. And so far $1400 in repairs and the check engine light is still coming on. You can read here for more information about how the system works, and its always a good idea to buy your own code scanner. Thanks! thank you Justin for the input guess ill get those tests. It was a salvage title and the seller was a hobbyist mechanic who I believe worked a little bit on the car before selling it to us so I kind of believed him. Should I make sure they checked the O2 sensors, A/F fuel ratio, ECT, MAP before I allow them to replace it? My independent Subie guy has access to some used Cats for about $500 installed, but Im concerned thats not the only issue. I have been driving it around for over a year. Connect the hose of the gauge to where you removed the oxygen sensor. Also the HG failure could have degraded the Catalyst as well, but the most common reason they fail is they get all choked up with carbon and crud and no longer reach the light off point. Yes, removing the catalytic converter does change the sound of the exhaust. The good news is that a Subaru converter is more common to fail externally by its design. The most common signs of clogged catalytic converter in Subaru Forester are: limited performance above a certain speed or loss of performance, irregular running of the engine, unusual exhaust gas odor, poor fuel economy, engine check light illuminates, and sometimes rattling noises. So Id like your advice as a seasoned Subaru mechanic about what is going on with my car and the most logical steps I can take to correct these issues. Dealer reports teh Engine light went on today due to P0420 code. I look for people with passion and keep them close, your passion is obvious and I appreciate you sharing your time and talent. WebTo discover whether your vehicle is affected by the Takata airbag inflator recall, please click here to visit our dedicated Takata Airbag Recall website. I would in fact start with having Subaru OEM type bearings re-installed, if the bearings themselves were in fact the original cause and we installed suspect bearings the diagnoses or theory may have been correct but the correction suspect. Thank you for any information on this subject. It may very well be that the issue is a weak convertor that is being affected by the colder temperatures only. The P0172 needs to be diagnosed and addressed and it just should not be driven until it has been I am afraid. You make an interesting point, its the cost for cleaner air and will only get worse newer cars have more Catalysts. This is certainly going to affect my thinking when it comes to possibly purchasing a used car in the future. A fuel mixture that is too rich, i.e. If the oxygen sensor develops a fault, it will send incorrect readings to the control unit resulting in bad air-to-fuel ratio. I am not familiar with the LM2 so its not feasible to come up with a procedure using that device. What do you think of this?? I am considering to keep my subaru another 100k. I have been doing a good deal of research on the internet on the code with the hope that I might be able to avoid replacing the CAT. Takata Airbag Inflator Recall. All Rights Reserved. Runs like a champ for the rest of the year. I took the cables off to clean them again and a day later, same thing. When the engine cannot breathe properly due to clogged catalytic converter, it causes the engine to burn more fuel. Still getting P0420 after replacing both cats, front cat and rear cat on 2008 subaru legacy. The car is now on its 5th cat. They also swapped O2 sensors from LHS to RHS and still got the same reading. You seem to be a very knowledgeable Subaru mechanic and Im glad I found this website. When I purchased my 05 Outback 2 years ago (then 125k, now 144k) the CEL was already on with an error code specific to the front O2 sensor (P0051 I think?). Cannot find any reference. What fuel additive would you suggest, if any? it could be worth importing them myself from what Ive read online most Subaru ones appear to only be around the $1000 each mark. There is 7166 miles on this allegedly new catalytic converter. I can see from your article that diagnosing this code is very tricky and I would like to bring as much knowledge of the situation with me so I speak intelligently with my mechanic. Quick question for you, been dealing with an on again off again P0420 code for about 5 months. Best Regards If the rest of the car is in good shape I would never suggest you get rid of it for a failed convertor, you may be able to get many more years of good life out of the car, the converter is an emissions control device and even when the light is on ass a result of the Computer not seeing the data it wants, the car may not be grossly polluting. These metals give the catalytic converter a 3-way operating characteristic that can changeCO, HC and N0x to inert gases like CO2. Reading out the fault codes using a diagnostic device is relatively reliable. Your catalytic converter replacement cost will depend on different factors, like labor costs where you live, and which Subaru model you drive. Helps your vehicle emit harmless gases Direct OEM replacement. Most times if we make the repairs the same visit we will discount or waive the diagnostic fee. I cant comment on what you should expect to pay other than at my shop, we charge $96.00 to perform a Catalyst function test in conjunction with graphing data from the 02 sensors. Data from any sensor is only as good as the sensor it self! Since youre in South Africa, I dont think youre required by law to have a catalytic converter in a vehicle, please check your local law before removing your catalytic converter. One of the more common codes we see on the Subaru, is P0420 CatalyticConverter Efficiency Below Threshold. It took me about 5 years post education to be a good enough technician to really be able to accurately diagnose these type of conditions and even then sometimes more experience may generate even better results such as a better understanding of cause and effect which can lead to fault prevention. At one time I had a running to lean code but it has cleared its self. I've heard they can get up to $1000 for the metals in Toyota cats. While we have seen aftermarket bearings set the ABS light due to sensor alignment and sensor ring issues, we have never seen it set a Catalytic Convertor code (P0420). The OBDII connector is usually located under the dashboard. Many converters on Subarus begin at a front Y-pipe that bolts to both sides of the engine. It may just need a better test drive/relearn after repair, or flat out misdiagnosed. Are there any symptoms to watch for h.g. The converter would not light off if it was toocold or if the air fuel mixture was too rich or ifit is defective. Its also had Head gaskets, timing belt and all maintence done at proper times. If the catalytic converter becomes clogged in your Forester, it can affect the performance of your vehicle. I have With a noticeable loss of performance, high fuel consumption and more harmful emissions at the tailpipe, a defective catalytic converter should definitely be considered. Hello, I have a 2001 Subaru Forester with 111,000 plus miles on its 2.5 liter engine. Should I take it to the dealer or let my guy do it? Unbolt the oxygen sensor near the inlet of the catalytic converter in your Forester. Subaru has determined that the efficiency of your vehicles front catalytic converter may degrade over time. russellpat Registered 2022 Outback Touring XT. I have an 05 Subaru Legacy Outback coming up with a P0420 code. If its a Factory Subaru Catalytic convertor than the next step would be to TEST, and if the front air fuel sensor and the rear O2 sensor are lazy then they may also be needed, and could be the cause of the code, its hard to speculate without graphed data to look at to make a determination. I dont want to put over $1,000 into a $2,500 car. Poor acceleration The Cerium acts like a spongeand soaks up the oxygen when the system islean and releases the oxygen when the mixtureis rich. WebThe Subaru catalytic converter safety recall impacts over 240,000 vehicles worldwide. It doesnt have three convertors, it has a single piece primary and secondary convertor assembly. The point I am trying to drive home is its not simple, its not possible to diagnose without testing, its instead at that point called guessing. My biggest confusion is which cat conv is the problem. if it doesnt well you need a Cat convertor. You wont find any answers until the code is read and a plan made form there. typically be part of a 100,000 mile check up? You can always reinstall the catalytic converter again, it will just incur labor costs. Service rep stated that in some instances, the attached heat shield cannot be removed (due to rust) and needs to be replaced (which could require later revisit). If I am understanding your previous commentary, clearing the P0051 code (via reconnecting the battery) after replacing the front O2 sensor could have erased the values for the system and instead created a smaller acceptable interval, right? Many owners not savvy enough to do the work, will have to dish out money for labor installation as well. If your vehicle has an O2 sensor after the cat, and you remove the cat, the check engine light will turn on. vapor, nitrogen, and oxygen before the exhaust is expelled into the. Thank you Justin, that is good to know! Ive learned more here in the last 20 minutes, not just about emissions, but servicing and testing in general. Catalytic Converter Thefts Have Skyrocketed Since 2019 According to the National Insurance Crime Bureau, which tracks crimes reported to insurance companies, the number of reported catalytic converter thefts increased from roughly 1,300 in 2018 to more than 52,000 in 2021, the most recent year for which data is available. 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