106K miles, Had a major engine service about 4 months ago and now check engine light is on. View details Hide details. 3 cranks later it comes back on i went and had it tested this past Friday with a huge obd2 scanner that shows alll the runtime data the and while we were looking at read outs the code auto cleared like completely Vanished and all read outs looked correct especially now that i see your diagrams the o2 sensor read out nice and stable like when the code cleared itself im presuming this is the off position ? 4) **Should I just continue to drive it, with higher octane (per manual recommended 87)until the light comes on again? Is the one year lifespan of the aftermarket converters common, or just when theres a cause like a head gasket leak to make them fail? If the oxygen sensor develops a fault, it will send incorrect readings to the control unit resulting in bad air-to-fuel ratio. Is that normal with the new Cat? I am always vigilant about tightening the gas cap for several clicks. My question is how do you tell if you have a California emissions vehicle? Is this an indication of an oxygen sensor? May that be the problem? Most times if we make the repairs the same visit we will discount or waive the diagnostic fee. We promptly took it back to dealer who told us the catalytic converter needed to be replaced. 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Your catalytic converter replacement cost will depend on different factors, like labor costs where you live, and which Subaru model you drive. My car too has the p0420 code. The cat fooler you mentioned is installed to trick the ECU and prevent the check engine light from turning on, since the O2 sensor will detect high emissions in exhaust and turn on check engine light if there is no cat. The OBDII connector is usually located under the dashboard. I dont want to put over $1,000 into a $2,500 car. Some weeks later, in early December, CEL came on. Its a week later, and all is still good! Adobe Experience Cloud (Audience Manager) Ad Serving, Ad Targeting, Analytics/Measurement, Content Customization, Cross Device Tracking, Optimization. Subaru Forester 2009, Catalytic Converter and Pipe Assembly by Davico. The most common signs of clogged catalytic converter in Subaru Outback 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. When I test with an OBD reader, I get the P0420 code. So hes leaning towards the Cat being replaced. The catalytic converter is part of the exhaust system in Subaru Forester and its main purpose is to convert exhaust gases like carbon monoxide and hydrocarbons that are harmful to health and the environment into less harmful byproducts, like carbon dioxide and Subaru Catalytic Converter Location COIA Contents [ hide] to hopefully pin it down. Kind regards, and thanks again! Ken. Subaru has determined that the efficiency of your vehicles front catalytic converter may degrade over time. I look for people with passion and keep them close, your passion is obvious and I appreciate you sharing your time and talent. However, it can fail much earlier due to contamination, overheating or physical damage. Your Subaru Forester leaves the factory with a catalytic converter. That should be a P0420 code: cat inefficiency bank one. EXHAUST, Engine, CP - OEM Subaru Part # 44620AA750. At the time of purchase we took it to a Subaru dealership of our own choosing and paid for a multi-point inspection (the same one they do for certified pre-owned cars). These metals give the catalytic converter a 3-way operating characteristic that can changeCO, HC and N0x to inert gases like CO2. If you are not able to locate one, than that is most likely ruled out as a possibility. Hi Justin/ Any chance you have that other article around? I did manage to speak directly to the technician and he seemed knowledgeable and thought that the front and rear sensors were ok, but that the catalyst needed to be replaced. Full Diagram #44102B EXHAUST. Its possible there is still an Exhaust leak, but I wouldnt know that to be accurate unless I see it. Do places that carry the correct CAT charge the same for it? Should I take it out for a long drive? I really appreciate your help! The difference in price is $300 more it seems. Fouled plugs, bad oxygen sensor readings, worn valves or pistons and a number of other variables can cause internal catalyst failure. But just before the lights went on the first time I had filled the tank and added STP engine cleaner additive, which I had never used before. Justin has been providing Subaru Owners (regardless of where they live), with tips and advice about their Subaru since 2006. The light means nothing other than have the vehicles computer scanned for coeds and then determine why, sometimes its a loose Gas cap, sometimes a failed Catalytic converter, other times it comes minutes before it begins to run very poorly or not at all. Like yourself I decided to live with it since it wasnt imparing my driving. Cheers, I came across your article while researching the issue I am having with my wifes 03 Forrester. vapor, nitrogen, and oxygen before the exhaust is expelled into the. it could be worth importing them myself from what Ive read online most Subaru ones appear to only be around the $1000 each mark. Clare. Now, I own and run a good shop that cares about our customers, If you go to a Dealer it will be higher, if you go to a general repair shop it may be higher still and not correct, if you find a version of my shop near you, than you should expect to pay close to what we charge if not it will be different. 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 recurring CEL code of P0420. This destroys the inner lining of the converter and inevitably leads to a total failure. Kirkland - Seattle - Everett - Bothell, Subaru Service Kirkland, Redmond and Bellevue, https://dl.dropbox.com/u/7723638/Diognostic%20Subaru.pdf, 2004 PZEV w/420 code will Subaru help w/cost to fix? The why is learned data that has been lost typically with light of parameters, coolant temperature and maybe engine repairs that make changes in Combustion temperature such as replacing leaking head gaskets. We review every problem as we work to keep our roads safe. Is this indicating it is the cat conv at engine end that is reading below threshold.? I have outlined the rear 02 sensor in yellow, the pattern we are seeing indicates either the Catalyst is not reaching the point of light off or function or the rear 02 sensor is sending incorrect data to the ECM (Engine Control Module) . Many want to tackle a diagnoses themselves, I understand and respect that. I replaced it when I got home and the CEL went away. If you notice higher than 3 psi (0.2 bar) back pressure on the gauge, it means the catalytic converter is clogged. EXHAUST & MUFFLER '02MY-'03MY. Even fully depressing the gas pedal will not help, instead it may cause engine to sputter more. 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Also, thanks for taking the time to help out fellow Subaru drivers. If its over 80,000 miles than you should budget for a Catalytic converter Replacement in the Future. To the cause of the noise, has anyone evaluated any of the seals in the front rotating masses for dryness and noise? I was able to graph the 2d O2 sensor. Webexhaust pipe containing the catalytic converter. Its a California emission vehicle, but I have tried two different non-California catalytic converters, and both have failed. If it is because I had the battery out for so long what do I do to fix it. I have her note book of every repair and maintenence item recorded with all the receipts. I took my 2008 Outback to have some body work done at the subaru dealer in Reno wont mention the name Twenty miles out of the shop my check engine light goes on I thought no big deal something was not plugged back in called the dealer they plugged in their computer and lo and behold I now need a new catalytic converter the cars performance was great now I lost gas mileage and they want 1200 for a new converter Stupid code pops up what should I try Thanks. I think I observed a good lights out condition (flat line) but with periodic rapid drop offs down to zero and then steep return to lights out. Thanks once again so much for your wisdom! been maintained. The why is learned data that has been lost typically with light of parameters, coolanttemperatureand maybeenginerepairs that make changes inCombustion temperature such as replacing leaking head gaskets. My car is a 2.5 06 Outback with 85,000 miles. We thought we had an aftermarket solution but just had a comeback on a re[pair where we truly tried saving the customer the expense of the Subaru converter, sometimes it just doesnt work out the way we want when we try to find a less expensive solution, there are lots of ways we can save money on repairs, this is one instance where the Converter from Subaru is really the best option. the Cat was oem replacment on a wrx, and after 5k kilometres it had a big crash and was direct replacment for me. Hi Justin, I would appeciate your comment on my 2010 Outback. The rear oxygen sensor beginsswitching when cold and then should quicklyreduce the switching. What questions should I ask befroe replacing the Cat Conv? Great site Justin..and wish you were in Va. I have had good results with previous auto injector carbon problems, is there a better product for cat cleaning to use along with running it hard? The 420 code and how it is running will have no correlation 99.9% of the time. After reading your explanations I end up with more questions than I started with. But its not so good for the environment. Thats why no one really wants to tell you if you should drive it, a good idea is having your own code scanner and checking it your self here and there until you can budget for repairs if you choose to do them. $6100 is way to much $. The point where therear oxygen sensor becomes a straight line iscalled the catalytic converter light off point. Learn More. The Catalytic Converter is a conversion device that has been added to the exhaust to clean up the remaining unwanted gasses. I dont dispute that the catalytic converter probably needs replaced. Hope that helps and best of luck going forward. Justin. I have taken my car to the dealer 3x and 2 x they reprogrammed it and the third time they blame it on needing a tune up. Closed Public Holidays) or email at feedback@subaru.com.au. 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