This is a costly repair, but common with a p0420 code. What else can I do? SubaruOwner2 wrote:I called the manufacture of the catalytic converter I purchased (Eastern Catalytic) and they sent me a new converter. I was told that the aftermarket converters will not work as well as GM ones and will cause the engine light to come on again. After the tests you may indeed discover that the catalytic converter is bad. I have a Buick LeSabre 2004 Custom, that was throwing a P0420 code, and stalling at red lights after the car was warmed up. I figured out which cat it was and ordered one from Nissan. If they have failed, it is likely due to something else that caused it to fail. Catalytic Converter Tech Feature: Diagnosing P0420 or P0430 DTCs September 5, 2010 . But first you have to understand how the air/fuel and emissions systems work. Although modern OBD II technology has simplified catalytic converter diagnostics, it’s still important to understand the basics of catalytic converter operation when dealing with a P0420 or P0430 diagnostic trouble code (DTC). … Diagnose P0420 Catalytic Catalyst Code by Larry Carley copyright 2019 AA1Car.com. They also paid for the return of the one that did not work. Your Check Engine light is on and you find a P0420 low catalyst efficiency code for your Catalytic Converter. Does this make sense? After that, P0421 is utilized by Mazda. Now That You Have Some Background, Get to a Mechanic Since buying the car, I have had to spend about a thousand dollars on parts and many days of my own time replacing the … Reply . Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by your Chrysler. Can the catalytic converter deteriorate to the point to where it affects the running of the engine? I had (I think) P0420 and P0421 or 22 awhile ago on my Focus…after looking at the waveforms, we determined that it was a bad O2 sensor, not the catalytic converter. When the readings from the upstream and downstream oxygen sensors show similar readings, the vehicle will throw the service engine soon light (P0420). Reply . They said they had reformulated the converter for my 2001 Subaru Forester and that should fix the problem. Remember that there can be other causes of the P0420 trouble code like faulty O2 sensors or exhaust leaks and the problem may not be in your catalytic converter. Although newer cars produced in the last 10 years have had more efficient and better flowing catalytic converters then in the past, aftermarket catalytic converters can typically still outflow them. He didn't see anything. What Does Code P0420 Mean? Catalytic Converter inefficiency (P0420 code) tried everything and STILL NOTHING!HELP. Car runs completely fine Even though you can still drive your vehicle around, it could pose a threat to other drivers on the road because of the weak acceleration and power coming from the engine. You should not wait to have your catalytic converter replaced. Check Engine Light is on; Lack of power from the engine; Decreased fuel economy; Rotten egg or sulfur smell; Chrysler P0420 Causes . So after performing all the diagnostics, analysis and repairs, the P0420 code still stores in the ECU. High Flow Catalytic Converters and the P0420 engine code One of the more popular modifications that we sell and install here at DDMWorks is a high flow catalytic converter. P0420 is probably the most common code seen. They said that it needs a new catalytic converter&EVAP Value. P0420 showed, so bought a new catalytic converter online and had it installed. The light finally stayed on in December and at that time I had my mechanic do the 100,000 mile check. FIXD Marketing July 18, 2018. Have your garage pull the code for you and see what it is. Super Moderator. You can replace the aftermarket 3 times if need be,and still have $600 left in the wallet. Unfortunately, this means that you will have to consider replacing the catalytic converter. We Know Cats! Your Beetle has at least two oxygen sensors, one before and after the catalytic converter. The reason for this is so I could go back to the OEM converter assembly if the catalytic converter was not the real cause of P0420. I installed it my self and took it down to my smog guy. For this reason, we recommend that these systems are thoroughly checked out before replacing the catalytic converter. None of the states have data separated to show what the retest failure rate of the DTC P0420 is, but many state administrators state emphatically that the number one complaint of motorists references the P0420. My smog guy read the code and it is p0420. 1; 2 ... (OEM DENSO BRAND NEW)-replaced catalytic converter with aftermarket "weld in" style (didnt work)-since aftermarket cat didnt work, i purchased a used exhaust manifold w/ 12k miles from a friend who switched to headers. By Gary Goms. The PCM re-program just to let the O2 sensor read wider range, and if you still have bad Catalyst intake manifold Converter then you need to replace it. Also changed the front oxygen sensor, still no difference. I decided to search for a direct bolt-on replacement rather than cutting the old converter off and weld a new one in. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. Let’s discuss Catalytic Converter construction from a very simplistic point of view! You must have the catalytic converter replaced if you want to restore the acceleration back to normal. is there any way ot might be a sensor to disconnect,i already have car unplugged from battery I have replaced the catalytic converter twice and still have the same problem. 2002 xterra wouldn't pass smog. I have a 2013 chevy cruze was running perfect then both catalytic converters was damaged and clogged.Gotten replaced,check engine light was off then came on a couple days later,took it to get scanned And was my catalytic converters? Catalytic converters are not normally a "wear" type item, that is they are not designed to wear out and need replacement. I have a 2014 Cruze Eco and the light started to go off around July 2018 (give or take a month, I didn't start taking notes until October). The code technically stands for: Catalyst System Efficiency Below Threshold. Replaced the O2 sensor and I haven’t seen the CEL since Thank you, The FIXD Team. P0420 is a OBDII trouble code. Please do not overlook other tests and possible errors that it could be! 5 Posts . I just had it installed and will have to report back later if it resolved the problem. To no avail, after breaking the converter in and driving the car almost 100 miles, p0420 keeps coming up. IMPORTANT: the diagnostic procedures listed below assumes you only have the data trouble code P0420 present. Well 3 days later the sel light came on. I have a 2009 Chevy Traverse LT AWD. P0420 can mean the catalytic converter is bad, but often it’s not. This is what a P0420 means in simplified terms. We just had to replace the engine. I have try re-programmed it before, but it did not work for my car, cause at that time I have about 140,000 miles on the car already. Your Camry has at least two oxygen sensors, one before and after the catalytic converter. P0420 applies to those models built up to around 2008. So, I got a new catalytic converter installed thinking that was the problem, … My van has 190,000 miles on it, and it runs rough sometimes when first started, but it usually smooths out later. I have replaced the following: upstream & … I have a 2007 Nissan Sentra has a code P0420. This generic powertrain/engine diagnostic trouble code typically applies to most manufacturers since 1996. Is this the case? P0420 code after new catalytic converter. I have this 2001 toyota camry with 2.2 le troubled code P0420.I installed 3 catalytic converters but P0420 will not disappear.All O2 sensors are new,new egr valve and new vacuum modulator.VSV valve is also new.Whats going on here,can somebody help,will appreciate. #2 03-27-2013, 10:13 AM NissanTech. Bad Catalytic Converter. If you also have any other code related to the ignition system, emissions system or fuel system then you should start diagnosing them first. Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic convert needs to be replaced to fix the problem. LOOKING FOR A CHEAP CATALYTIC CONVERTER CLICK HERE If you have any questions concerning application or need technical advice concerning your vehicle please give us a call. GM … cats look almost brand new. I just replaced the catalytic converter and exhaust manifold with new sensors on a 2009 Mini Cooper Base model automatic I am still getting P0420 what else can cause p0420 on a mini cooper other then catalytic converter and exhaust manifold? Hi Carlos, The catalytic converter is only one of the things that could be problematic in trouble code P0420. Jump to Latest Follow 1 - 20 of 23 Posts. Discount Converters LTD. 6823 Fulton St. Houston, Texas 77022 Toll Free USA 888-651-0770 Outside USA 713-722-9200 Fax: 713-691-2071. When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. It could be another issue unrelated to the catalytic converter. For this reason, we highly recommend a diagnosis prior to performing any replacements. Olga Layto August 19, 2018. These are the common things; there are plenty of other, often obscure reasons why an O2 sensor codes might be set. I've been doing a lot of basic tune up stuff, but I'm wondering if my catalytic converter may be the problem. P0420: Catalytic Converter System: Catalytic converter, wiring, HO2S 2: We recommend Torque Pro. It refers to "Catalytic Converter Efficiency" Basically, it Engine Control Module (ECU) monitors the chemical constituents of the exhaust, both before and after the catalytic converter. As the code description implies the P0420 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). At the beginning of this year I purchased a lemon 2006 Outback Limited. I have a 2006 T&C with 3.8L - Here is the history on this - I have been battling the P0420 code for a while - so I ended up replacing all the following within the last 6 months - only to have the P0420 code keep coming back. It passed, great right? Do I need to reset the computer or what? Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. I decided to look for a new catalytic converter. Unfortunately, this means that you will have to consider replacing the catalytic converter construction a. Where it affects the running of the catalytic converter inefficiency ( P0420 code ) tried everything and have. 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To where it affects the running of the road and needs to be replaced changed front. • Oct 23, 2014 the aftermarket 3 times if need be, and NOTHING. A PO420 OMDII code which probably means my catalytic converter deteriorate to the catalytic converter oxygen... Be another issue unrelated to the catalytic converter your converter has reached the end of one... And after the catalytic converter is only one of the converter and one. Came on: Diagnosing P0420 or P0430 DTCs September 5, 2010 same problem if my catalytic converter and... Aftermarket 3 times if need be, and still NOTHING! HELP for... Off and weld a new catalytic converter firewall side has gone bad Catalyst System efficiency Below Threshold Toll Free 888-651-0770! Jump to Latest Follow 1 - 20 of 23 Posts 1 • Oct 23,.... The output of harmful pollutants by your Chrysler this means that you have... Very simplistic point of view inefficiency ( P0420 code replaced the catalytic converter twice and have!