To turn off the check engine light, you install cat fooler/space. If Suburu cars need such work every 50,000 miles, then I wonder how youre still so highly regarded. 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. The good news is that a Subaru converter is more common to fail externally by its design. One of the more common codes we see on the Subaru, is P0420 CatalyticConverter Efficiency Below Threshold. Hi Justin everything was fine for about 200 miles replaced the upstream air/fuel sensor, and the same thing happened. for around 200 miles, and then the code reappeared If the temperature difference is higher than 10 degrees Celsius or 50 degrees Fahrenheit, then most likely the catalytic converter is clogged. Here is a scan of the diagnostic that dealership gave me They are recommending a new catalytic converter ($1,000 parts and labor genuine Subaru converter), saying the oxygen sensors are fine and there is no exhaust leak. I looked at the muffler and I didnt see any black soot and infact think the muffler looks fairly clean considering its age and mileage (which the PO said was mostly freeway miles). Only a scan of the code history will determine if its in memory still. The rear oxygen sensor beginsswitching when cold and then should quicklyreduce the switching. Is that accurate and if it is a new ECM should I ask if it has been calibrated? Your catalytic converter replacement cost will depend on different factors, like labor costs where you live, and which Subaru model you drive. There is just no Quality aftermarket Convertor on the market today, especially for the state of California. EXHAUST & MUFFLER '04MY-'05MY. I was able to demonstrate that I had taken proper care of my car, and Subaru paid for all of my entire HG repair, even though my car was at 160K miles and about 10 years old (beyond recall specifications). Web2006 Subaru: Engine and Cooling Products Search "Catalytic Converter" for 2006 Subaru Catalytic Converter Part Number: 44612AA490 Pipe Center Exhaust. Over time, carbon deposits accumulate and clog up the catalytic converter, especially if the vehicle has racked up a lot of miles. P0420 code was detected, and Subaru dealer eventually performed catalytic converter replacement under warranty. My dad recommends that I just sell the car, in fear that it may cost us much more than we bargained for. I have read that the leaking head gaskets and the additives they used to put in the oils cause the inside of the cats to deteriorate. ), 2. Dealer reports teh Engine light went on today due to P0420 code. 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. Is this because of catalytic converters or o2 sensors or something else. 5)**What is the likelihood of an actual meltdown? Should be done in the next day or so. I filled the gas tank with 93 octane and dumped a bottle of Gumout fuel boost/water remover in the gas tank today. Would a HG leak destroy a cat in under one year and approximately 11000 miles? WebVehicle Recalls. I wish you would have tried us for the parts for your repair. Cannot find any reference. This is to get your attention as the public tends to ignore the check engine light or think they just have a loose gas cap, then the next day they are stranded. Driving up Mount Rainier was not an option here for me, but running up and down some local hills in 3rd gear and about 4800 sustained RPMs (plus the 93 octane and the Gumout gas treatment) cleared the CEL in short order. If you have an idea about this I would really appreciate some help. I appears that it is a clogged cat converter. Justin. the car has 121K on it. Hope that helps and best of luck going forward. The Catalyst dont fail just because, there is 90% of the time some sort of a reason, such as an internal HG leak, a misfire, a rich running condition or lots and lots of around town type driving and not enough maintenance. ANYWAY, over the weekend I was driving thru town, when I had to abruptly stop to avoid someone backing out of a parking spot on the main street and my CEL came on immediately after this. CE light came on yesterday. Which of these am I looking for if it is the cat that needs replacing?? Today driving to pick up my kids sudently a solid check engine light, solid traction control light, and flashing cruise light came on. Yes the Turbo equipped Subarus can and will have more engine related issues than a NA (Naturally Aspirated) engine will have but thats true for every car and its also mostly about maintenance habits. Yes, removing the catalytic converter is good for engine performance, as the engine can breathe more easily. Thank you in advance for your help, I am going to go lube her up and look under her hood so she knows I still lover herfor now. Over the last couple years it has been on daily short distance trips (barely enough to get it warm).Other symptoms are noticeably lower fuel economy and very bad exhaust smell. 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. Yep, need to get that code read! Recall date. The dealer said they do not do the efficiency test. They also tried to source ECU remap codes that would just ignore the reading from the O2 sensors which is how they have solved issues with other models (our emissions laws are not quite as strict as USA or Europe) but because the Tribeca is built in the USA not Japan there is nothing available. The lowest price I have seen is for $325 at rockauto (I havent priced an OE CAT but Id imagine its more expensive). Is the work being done at a shop with a Guarantee? They have already charged me $95 to do the testing to date and could drive the car with the monitors hooked up for another $95 to do more testing but I am not sure what that will do. Have a 2008 Outback 2.5i Pzev and got a P0420 code after a HG change (external coolant leak). Should I take care of the noise/wheel bearing problem first and see if the CEL and blinking cruise light resolves itself before investigating other causes like O2 sensors and catalytic converters causing these warning lights to come on? A partial zero emission vehicle (PZEV) is an environmentally friendly automobile that meets strict standards. above you mentioned , The next part is a little less scientific and a little more in the grey area, its entirely possible for a check engine light to occur after the battery is disconnected and set a PO420 even though there were no indications of a catalyst issue prior. Another thought, how much air pollution is caused in the production of a Catalyic Converter? But even though this could be a smaller margin for error, it would still be indicating a problem to be addressed in the future? 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. I did have the battery out for about a week and a half while I was working on it in my spare time. Any other thoughts or advice would be appreciated. There are many factors that affect its service life, but typically catalytic converters last for around 100,000 miles or 10 years in Forester. Hope that helps, thanks for the data it really helps me give you some factual advice! Thank you for any information on this subject. They are adamant its not an O2 sensor as they said there are different codes for that. I need to know what I should do first. Thats the place to start. They are a large and reputable dealership https://farmerautovillage.co.nz Anyway they cleared the codes and told me to monitor it. Maybe just drive it for a bit and see how it goes? I limped over at about 5 MPH to the Firestone garage where I take the car for routine maintenance and they diagnosed it as a bearing in the driveshaft. Buying and replacing the converters will be expensive enough. Hi, My 06 outback kept tripping the 420 code off and on for a year. Im not very fond of the dealers service department at this point (not because of the $5k necessarily, but that I had to take the car back twice for them to fix the issues). Then covid and the car has sat for two years now im buying it cause his position is work from home now and he didnt need the car anylonger. 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. 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. The purposeof the catalytic converter is to reduce HC,CO and NOx. Many want to tackle a diagnoses themselves, I understand and respect that. There is no change in the cars performance, and Im trying to determine what I need to do next. The light off will be shown by data from the rear o2 sensor. Pictured below is what the rear 02 sensor readings will look like once theCatalyticconverter reaches the point of light off. 370 people reported this problem 140 comments Subaru Forester Vehicles With This Now, here is my question. Well, the light came on again maybe in mid January. Except, two weeks later, its back on. So the P0335 is a Crank sensor code and may be as simple as needing a new crank sensor, the P0420 is related to a convertor not reaching the point of light off any more which wont prevent you from using the car. We review every problem as we work to keep our roads safe. To begin troubleshooting, you must first connect the diagnostic tool to your Forester. I even did the spirited drive as you recommended. The next day the CEL came on within about 5 minutes of driving. If you have read this article or any of the other ones I have written about the check engine light you will see that I suggest a code scan in correlation of the light coming on. Thanks so much Justin, I saw a TSB for 2010 Subarus that the ECM had to be remapped so that the O2 sensors read correctly. 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. we just purchased it and picked it up last night, and while the wife was driving it to work, got all manner of lights flash up. These heat shields are susceptible to exposure and can break loose from connections and create annoying rattles while driving. A gas cap being loose would never cause a PO420, it could set a P0457 or P0440 however. Yes they should (well lets hope) have looked at the Sensors first, but you just never know. If you look at the graphs you will see the pattern from a faulty Cat or one that is good but not up to temperature yet as well as what the pattern looks like when the convertor is functioning okay. I had the check light come on. Is that normal with the new Cat? It also started occurring at slow speeds (driving around a parking lot). Put in some 94 octane, and some fuel injector cleaner and had that spirited drive on the highway to put some life back into the Cat (as per Justins great recommendation! Just found your website today, fabulous! Should I make sure they checked the O2 sensors, A/F fuel ratio, ECT, MAP before I allow them to replace it? The shop told me they used Beck Arnley bearings and that is one of the brands that some owners reported having problems with. I have a 06 Legacy with 130,000 miles. Also typically the idling rough and stalling on a drive by wire Equipped Subaru ( post 2005 most models) is corrected with a relearn, and unless the battery was recently replaced or there was some other cause for the battery to be disconnected its unlikely that is the cause this time. Wish I could offer you some help but I would be guessing that something new has come up. For this test, all you need is a pressure gauge with its hose fitting. 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 running lean code could be a clue as well. I would like start by posing three questions: First, you mention that the code can be triggered by a faulty fuel pressure regulator. Great set of articles. 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. I have an 05 Subaru Legacy Outback coming up with a P0420 code. Thanks for your very informative article. The head gasket leak on your Subaru needs to be repaired, most likely the convertor and sensors as well. If its the Convertor and you elect to not replace it it will lower the fuel economy and will eventually cause enough of an exhaust restriction to affect performance especially under load. A diagnostic check gave us the (what seems like standard with these cars!) The vehicle is completely safe to drive with a P0420 set, however if anything new was to come up that could damage anything, you would have no way of knowing as the check engine light would already be on. Larry. 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? But if replacement is $1200+ each, then probably high target because there are more of the precious metals in it. Air bags. They CEL is now off and has been for about 4500 miles. This is our 2nd subaru outback with CC and 02 sensor issues, but they are safe and usually very reliable. Poor acceleration I did not get it replace. The issue at hand is the aftermarket ones may not have enough precious metal to function. Yes, removing the catalytic converter does change the sound of the exhaust. Justin Stobb is the Owner of All Wheel Drive Auto, the premier Independent Subaru Shop in the North West. Full Diagram #44102B EXHAUST. 106K miles, Had a major engine service about 4 months ago and now check engine light is on. If the catalytic converter becomes clogged in your Forester, it can affect the performance of your vehicle. If its over 80,000 miles than you should budget for a Catalytic converter Replacement in the Future. The catalytic converter was allegedly replaced at a Subaru dealership under recall. Obviously, I am not excited at the prospect of another catalytic converter replacement. This destroys the inner lining of the converter and inevitably leads to a total failure. It is impossible to achieve complete combustion with the current internal combustion engine . This is why time after time I state over and over I really cant comment on what prices will be somewhere else as the differ greatly just like house prices. Had the CE light come on, took to the same Subaru dealership (Wagners in Fairborn, OH great place) and the diagnosis was rear O2 sensor. Since then, the CEL hasnt come back on and I havent brought it to a shop to get it checked out because Ive been busy with school. Thanks once again so much for your wisdom! He reset and said it was fine to drive back home to my regular mechanic. 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