Data from any sensor is only as good as the sensor it self! Subaru has determined that the efficiency of your vehicles front catalytic converter may degrade over time. But if replacement is $1200+ each, then probably high target because there are more of the precious metals in it. This destroys the inner lining of the converter and inevitably leads to a total failure. 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) . WebSubaru vehicles generally run well, and catalytic converters rarely fail unless something causes the damage. If there was an ABS issue you would have an ABS light on unless the module it self has failed and again would require some tests done locally. Start the engine and wait until it gets into operational temperature. Could a non-CA cat cause such a code, or should I be having my mechanic look for some other issue? The aftermarket Convertors just dont have enough of the three precious metals to work as well and as long as the Subaru OE. Air bags. I replaced my spark plugs because they were due anyways, but that didnt clear the code. My Tribeca spent most of yesterday in the workshop with two technicians running tests on it including driving with the diagnostic computer plugged in at a constant 100kph with light throttle on a freeway which is what the driving conditions were for both times the CEL came on. I really appreciate your advice. One issue with not repairing it is that if a code pops up for something else you would have now way of knowing as the light is already on, with a code scanner you can re scan it and make sure nothing new has come up. Hello, I have a 2001 Subaru Forester with 111,000 plus miles on its 2.5 liter engine. Larry. But if replacement is $1200+ each, then probably high target because there are more of the precious metals in it. With a noticeable loss of performance, high fuel consumption and more harmful emissions at the tailpipe, a defective catalytic converter should definitely be considered. What other testing should they do? I wish we had Turbo Diesel Foresters here, but we just dont however. What should I expect to pay. Even with the check engine it was running perfect until it didnt. However, my cruise control isnt working. No change whats so ever. Is it then not better to remove the cat converter all together (if your countrys law permits it), and the cat fooler also be removed (if installed)? So the information I pasted above from your post. Did the techs come up with a solid fault? Other makes are experiencing the exact same issue Subaru Is not alone in this and its he price of clean air. Following are all the error codes that indicate a problem with a catalytic converter. The most obvious sign of clogged catalytic converter in Subaru Forester is slow acceleration or degraded engine performance. P0420 code was detected, and Subaru dealer eventually performed catalytic converter replacement under warranty. Bank 1 Below Threshold Thats the only next step. To the cause of the noise, has anyone evaluated any of the seals in the front rotating masses for dryness and noise? I have a recurring CEL code of P0420. and I am hoping for easy fix.previous owner says c.e.l. The lights were on until the tank was about half empty and then went off. 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. Subaru's number for this recall is TKC-20. I cant think of any other I would rather be in if I was ever in a Head on accident or out in the snow. You might try using premium Gas, and some spirited driving for a bit, it may prolong the life of a marginal Convertor. If replacement is $200-$300, probably not a high target. Another more slightly annoying feature Subaru owners discover about the exhaust system on their vehicles are heat shield rattles. Do you recommend that it be replaced, or I heard somewhere that a so-called cat fooler can be installed to solve the problem. Or do you not have info info to make an educated guess (I wont hold you to any answer you give me as I understand there are a ton of variables)? Without a code I have no idea what to try and suggest you check, while its always good to check the car fluids, the check engine light is not generally ever going to come on for low fluids. If you notice higher than 3 psi (0.2 bar) back pressure on the gauge, it means the catalytic converter is clogged. Testing now. Someone else suggested it could just be the oxygen sensors and not both catalytic converters, as the dealer suggested. When you press the gas pedal from a stopped position, the vehicle may accelerate normally initially. My son is an auto tech, and scanned to find the dreaded P0240 code. Poor acceleration 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). Poor acceleration I pretty much went through the whole engine timing belt, water pump, cluth, ect. However, it can fail much earlier due to contamination, overheating or physical damage. I got the p0420. Its possible after some spirited driving the Catalyst function could improve and light goes out, but under stand its a warning of things to come. Please advise if this is the way to go..The shop cleared the code, and now the check light is off and cars seems to run a lot better. It is not uncommon to see yet another converter downstream integrated in the construction of an intermediate pipe. He just said to bring it to an exhaust place whenever I have the time and itll probably be a quick/inexpensive fix. Typically the Catalyst and 02 sensors should be done a the same time. Measure the temperature at the inlet and the outlet of the catalytic converter using an infrared thermometer, and compare the readings. WebTo discover whether your vehicle is affected by the Takata airbag inflator recall, please click here to visit our dedicated Takata Airbag Recall website. Keep the fluids in good shape and that is the # 1 thing you can do to prolong the head gasket life. Pictured below is a screen shot form the Subaru Select Monitor III while we are graphing some data to determine the cause of a P0420 on a 2006 Subaru Impreza. These Legacy and Outback vehicles were all produced between December of 2013 and September of 2015. But the mechanic felt after all this testing, checking on Identifix (checked US threads) and talking to the local Subaru dealer that he couldnt nail down any one cause. The car continues to run great. If you are not able to locate one, than that is most likely ruled out as a possibility. Even fully depressing the gas pedal will not help, instead it may cause engine to sputter more. Save my name, email, and website in this browser for the next time I comment. Like I keep stating, if instead of the price on the sticker when you buy the car instead stated how much to own over 10 years no one would buy it, this goes double for German cars. Copyright 2023 Leaf Group Ltd. / Leaf Group Media. 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 it does than its possible something secondary is at fault. The cat fooler is installed between the pipe and o2 sensor. Its a California emission vehicle, but I have tried two different non-California catalytic converters, and both have failed. Hi Justin, I would appeciate your comment on my 2010 Outback. Ive tried to elaborate why in the article and subsequent replies. Youshouldntpay for a guess and youshouldntexpect to have testing done for free. I did Buy it used about 16 months ago at only 80,000 Kms. What questions should I ask befroe replacing the Cat Conv? Its been happening for about 3 years. Hope that helps and best of luck going forward. Can you tell me what is the drive pattern to complete the Catalyst Monitoring? I had my regular Subaru mechanic check the code and it was 0420. You mentioned further testing is not free. The 2000 outback has 107k and is running very well so I hope to keep it for a long time. My car is a 2.5 06 Outback with 85,000 miles. Unless the Catalyst is getting no where near the light off point? Based on all of the hits on the web regarding this Subaru problem Iwonder if theres a secret warranty out there?. oops again. 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? If you ever get around to that another article about PO420 coming on after an ECU reset, Id be delighted. This commonly happens due to a bad upstream oxygen sensor, but can also happen due to a bad MAF sensor or worn spark plugs. The car was purchased in Boston, MA and then driven to CA. Its got 95,000 mi. Is it possible that my car may need to relearn running temperature and exhaust leaks and such in order to correct itself? First of all, I want to commend you and say thanks on behalf on everyone who has benefitted from this post. Is this an indication of an oxygen sensor? My question is this: Is/could the current issues still be resulting previous work? With age and mileage, Im trying to fix this cheaply. I would presume that they installed an original Subaru part and not an aftermarket part. Need to perform a Catalyst test and try to determine whats wrong. Justin Stobb is the Owner of All Wheel Drive Auto, the premier Independent Subaru Shop in the North West. Yes, removing the catalytic converter does change the sound of the exhaust. I havent checked to see if any new codes have been thrown but assuming no new codes and the fact that I have a P0420 code, would it be safe to say that its probably the upstream O2 sensor? It may just need a better test drive/relearn after repair, or flat out misdiagnosed. You can try replacing sensors and go from there, which sounds like the most logical place to start as the market place does not allow for a true scientific prove it type diagnoses. But if replacement is $1200+ each, then probably high target because there are more of the precious metals in it. Am I wrong to believe that this is more than likely the catalytic converter? But I will save that for another article.. Tim. Thanks, You dont ever want to use Carb cleaner on the Throttle Body! Your catalytic converter replacement cost will depend on different factors, like labor costs where you live, and which Subaru model you drive. If the cat is tested and fails the test than it needs to be replaced, if how ever it reaches light off and still sets the code maybe its a candidate for the re programming as a first step. Subaru's number for this recall is TKC-20. I like you have also experience the cat converter which as been a problem since owning the car. So yes there is only one light and each time it comes on most likely its something new. Recall date. Also, is there another test the garage should be doing? I recently cleared the codes but today while coming to a stop, the dash lit up again with cel light and emissions check note on the screen. What fuel additive would you suggest, if any? Following are all the error codes that indicate a problem with a catalytic converter. Because of the integration of the pipe and converter assemblies, Subaru converters are very expensive. EXHAUST & MUFFLER '04MY-'05MY. All sensors should be tested and replaced as needed. Also, using the Torque smartphone app (I hope youre familiar with this), what display should I be looking at to check the rear o2 sensor waveform? May that be the problem? 2022 Subaru Outback Base {{loadingIndicator}} Hamburger menu. Anybody that has pulled the code just wants to replace the cat or sensors with theirs. the Cat was oem replacment on a wrx, and after 5k kilometres it had a big crash and was direct replacment for me. The only way to cut down on this is to put more precious metal in the Catalyst which would greatly raise the price. 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