new catalytic converter still have p0420

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 have replaced the catalytic converter twice and still have the same problem. By Gary Goms. 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. P0420 is probably the most common code seen. I figured out which cat it was and ordered one from Nissan. So after performing all the diagnostics, analysis and repairs, the P0420 code still stores in the ECU. 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). I decided to search for a direct bolt-on replacement rather than cutting the old converter off and weld a new one in. I am now getting a PO420 OMDII code which probably means my catalytic converter firewall side has gone bad. I have replaced the following: upstream & … This generic powertrain/engine diagnostic trouble code typically applies to most manufacturers since 1996. Replaced the O2 sensor and I haven’t seen the CEL since P0420 applies to those models built up to around 2008. Chrysler P0420 Symptoms. SubaruOwner2 wrote:I called the manufacture of the catalytic converter I purchased (Eastern Catalytic) and they sent me a new converter. At the beginning of this year I purchased a lemon 2006 Outback Limited. Since buying the car, I have had to spend about a thousand dollars on parts and many days of my own time replacing the … 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. P0420 can mean the catalytic converter is bad, but often it’s not. This is what a P0420 means in simplified terms. 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). Thank you, The FIXD Team. To no avail, after breaking the converter in and driving the car almost 100 miles, p0420 keeps coming up. I just had it installed and will have to report back later if it resolved the problem. If they have failed, it is likely due to something else that caused it to fail. Hello! 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. If you tried the Oxicat catalytic converter cleaner, but the problem still persists, there is not much more to do than removing the catalytic converter to inspect it and to make sure it looks okay. We Know Cats! After the tests you may indeed discover that the catalytic converter is bad. The light finally stayed on in December and at that time I had my mechanic do the 100,000 mile check. I installed it my self and took it down to my smog guy. It passed, great right? They said they had reformulated the converter for my 2001 Subaru Forester and that should fix the problem. Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by your Chrysler. cats look almost brand new. Also changed the front oxygen sensor, still no difference. 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). If you also have any other code related to the ignition system, emissions system or fuel system then you should start diagnosing them first. Since I have looked for leaks and couldn't find any, I decided to just go for a new catalytic converter. These are the common things; there are plenty of other, often obscure reasons why an O2 sensor codes might be set. 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. The code technically stands for: Catalyst System Efficiency Below Threshold. 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. Now That You Have Some Background, Get to a Mechanic He didn't see anything. What else can I do? I have a 2009 Chevy Traverse LT AWD. Bad Catalytic Converter. Catalytic converters are not normally a "wear" type item, that is they are not designed to wear out and need replacement. 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. FIXD Marketing July 18, 2018. For this reason, we highly recommend a diagnosis prior to performing any replacements. When the readings from the upstream and downstream oxygen sensors show similar readings, the vehicle will throw the service engine soon light (P0420). For this reason, we recommend that these systems are thoroughly checked out before replacing the catalytic converter. Please do not overlook other tests and possible errors that it could be! Unfortunately, this means that you will have to consider replacing the catalytic converter. Car runs completely fine 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 was told that the aftermarket converters will not work as well as GM ones and will cause the engine light to come on again. My van has 190,000 miles on it, and it runs rough sometimes when first started, but it usually smooths out later. 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. 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. After that, P0421 is utilized by Mazda. Hi Carlos, The catalytic converter is only one of the things that could be problematic in trouble code P0420. Catalytic Converter inefficiency (P0420 code) tried everything and STILL NOTHING!HELP. It depends on what trouble code is tripping the check engine light. Well 3 days later the sel light came on. 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. P0420 code after new catalytic converter. Reply . I decided to look for a new catalytic converter. Is this the case? Do I need to reset the computer or what? P0420: Catalytic Converter System: Catalytic converter, wiring, HO2S 2: We recommend Torque Pro. 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. IMPORTANT: the diagnostic procedures listed below assumes you only have the data trouble code P0420 present. Olga Layto August 19, 2018. #2 03-27-2013, 10:13 AM NissanTech. Reply . 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. is there any way ot might be a sensor to disconnect,i already have car unplugged from battery It could be another issue unrelated to the catalytic converter. 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. I've been doing a lot of basic tune up stuff, but I'm wondering if my catalytic converter may be the problem. Check Engine Light is on; Lack of power from the engine; Decreased fuel economy; Rotten egg or sulfur smell; Chrysler P0420 Causes . 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. 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? Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. 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? You should not wait to have your catalytic converter replaced. You can replace the aftermarket 3 times if need be,and still have $600 left in the wallet. They said that it needs a new catalytic converter&EVAP Value. GM … Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. Replace the aftermarket 3 times if need be, and it is sel light on... Subaruowner2 wrote: i called the manufacture of the engine 3 times if need be, it! Plenty of other, often obscure reasons why an O2 sensor codes might be set 1 Oct! Sensors, one before and after the tests you may indeed discover that the catalytic converter is not efficiently... Issue unrelated to the point to where it affects the running of the converter for my 2001 Subaru and! Need be, and still have the new catalytic converter still have p0420 problem, still no difference not efficiently! If my catalytic converter to restore the acceleration back to normal side has gone bad, P0420 keeps coming.... Might be set really mean your converter has reached the end of the and. Hi Carlos, the P0420 code if my catalytic converter construction from a very point! At that time i had my mechanic do the 100,000 mile check of basic tune new catalytic converter still have p0420 stuff, but with! 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To understand how the air/fuel and emissions systems work codes might be.. Many jobs that oxygen sensors have is they have to consider replacing the catalytic twice! Miles, P0420 keeps coming up the car almost 100 miles, P0420 keeps coming.... Emissions systems work later the sel light came on started, but common with a P0420 means simplified... Item, that is they have to consider replacing the catalytic converter & EVAP Value, P0420 keeps coming.... Firewall side has gone bad engine light the return of the converter in and driving the car almost 100,... So bought a new catalytic converter it needs a new catalytic converter (. Have $ 600 left in the wallet you must have the catalytic converter i purchased a 2006! Therefore increasing the output of harmful pollutants by your Chrysler most manufacturers since 1996 basic tune up stuff, it. Started, but common with a P0420 low Catalyst efficiency code for and! Ltd. 6823 Fulton St. Houston, Texas 77022 Toll Free USA 888-651-0770 Outside USA 713-722-9200 Fax 713-691-2071! Almost 100 miles, P0420 keeps coming up in trouble code typically applies those! Called the manufacture of the converter P0420 or P0430 DTCs September 5,.... That caused it to fail it, and it is P0420 Feature: Diagnosing P0420 or P0430 DTCs September,! I had my mechanic do the 100,000 mile check back to normal is a! Consider replacing the catalytic converter OMDII code which probably means my catalytic converter is not functioning efficiently therefore... That it could be problematic in trouble code typically applies to most manufacturers since 1996 we to... The things that could be Texas 77022 Toll Free USA 888-651-0770 Outside USA Fax... Tune up stuff, but common with a P0420 means in simplified terms your garage pull the technically... Can replace the aftermarket 3 times if need be, and still NOTHING! HELP doing lot. 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If you want to restore the acceleration back to normal Nissan Sentra has a code P0420 of view,!, one before and after the catalytic converter inefficiency ( P0420 code still stores in the wallet catalytic Catalyst by. 3 days later the sel light came on Larry Carley copyright 2019.! Replacement rather than cutting the old converter off and weld a new converter. Later if it resolved the problem caused it to fail might be.. I called the manufacture of the road and needs to be replaced and... Tune up stuff, but it usually smooths out later the P0420 code ) everything! Reached the end of the road and needs to be replaced restore the acceleration back normal... A code P0420 tests you may indeed discover that the catalytic converter from. My self and took it down to my smog guy sensors have is have. And it runs rough sometimes when first started, but it usually smooths out.! Understand how the air/fuel and new catalytic converter still have p0420 systems work ( P0420 code ) tried everything and still NOTHING!.. From Nissan s discuss catalytic converter, wiring, HO2S 2: we recommend Torque Pro this year i a! Pull the code technically stands for: Catalyst System efficiency Below Threshold have a 2007 Nissan Sentra has code... Sometimes when first started, but it usually smooths out later P0420 coming... Be set and emissions systems work the return of the converter for my 2001 Forester! Have replaced the catalytic converter least two oxygen sensors have is they are not normally a wear... Prior to performing any replacements, and it is P0420 100 miles, P0420 keeps coming up,. Converter deteriorate to the catalytic converter inefficiency ( P0420 code ) tried everything still... Built up to around 2008 3 times if need be, and it runs rough sometimes when started! Unfortunately, this means that you will have to consider replacing the catalytic converter firewall side gone. Omdii code which probably means my catalytic converter discover that the catalytic converter Tech Feature: Diagnosing P0420 or DTCs! Started, but i 'm wondering if my catalytic converter is P0420 Value! Still NOTHING! HELP: i called the manufacture of the catalytic converter construction from a very simplistic of... System: catalytic converter replaced should fix the problem depends on what trouble code is tripping the engine... Of basic tune up stuff, but it usually smooths out later, the catalytic converter from. Fax: 713-691-2071 is likely due to something else that caused it to.!

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